Prof. Dr. Beat Ruhstaller

Work at ZHAW

Position

Head of Organic Electronics and Photovoltaics

Projects

• Packaging technology, stability evaluation, and non-destructive testing for commercialization of perovskite solar modules / Deputy project leader / ongoing
• Rationally Designed Thin Contact Layers enabling Large-Scale Perovskite-on-Silicon Tandem Photovoltaics / Co-project leader / ongoing
• Defect Engineering, Advanced Modelling and Characterization for Next Generation Opto-Electronic-Ionic Devices / Deputy project leader / ongoing
• Fabrication of single crystal perovskite memristor / Project leader / completed
• Advanced Materials and Characterization Tools for Quantum-Dot enhanced Displays / Deputy project leader / completed
• PV2050: Simulation and Characterization / Deputy project leader / completed

Publications

Articles in scientific journal, peer-reviewed

• Aeberhard, U., Schiller, A., Häusermann, R., Hiestand, R., Blülle, B., Kohlstädt, M., Najafi, M., Veenstra, S., & Ruhstaller, B. (2026). Electro-thermal energy yield simulations for bifacial all-perovskite tandem modules. EPJ Photovoltaics, 17(12). https://doi.org/10.1051/epjpv/2026005
• Zeder, S. J., Krucker, T., Moia, D., Jenatsch, S., Artuk, K., Wolff, C., Ballif, C., Ruhstaller, B., & Aeberhard, U. (2025). Impact of luminescent coupling on perovskite‐silicon tandem external quantum efficiency quantified by comprehensive opto‐electronic simulation. Solar RRL, 9(24), e202500823. https://doi.org/10.1002/solr.202500823
• Torre Cachafeiro, M. A., Narbey, S., Ruhstaller, B., Nüesch, F., & Tress, W. (2025). Visualising ionic screening in perovskite solar cells : a bumpy ride along the J-V curve. EES Solar, 1(5), 762–774. https://doi.org/10.1039/d5el00133a
• Zeder, S. J., Blülle, B., Ruhstaller, B., & Aeberhard, U. (2025). Optimizing perovskite LEDs and tandem PV cells : the role of photon-recycling and luminescent coupling in presence of strong light scattering. APL Energy, 3(2), 26110. https://doi.org/10.1063/5.0268284
• Othman, M., Agosta, L., Jeangros, Q., Jaffrès, A., Jenatsch, S., Carnevali, V., Lempesis, N., Slama, V., Steele, J. A., Zhang, R., Solano, E., Portale, G., Boureau, V., Paracchino, A., Bornet, A., Lai, H., Fu, F., Sachan, A. K., Tress, W., et al. (2025). Suppression of stacking faults for stable formamidinium‐rich perovskite absorbers. Advanced Materials, 37(26), 2502142. https://doi.org/10.1002/adma.202502142
• Stanzani, E., Sem, S., Züfle, S., Ruhstaller, B., & Jenatsch, S. (2025). Evidence for localized trap formation during TADF OLED degradation. Organic Electronics, 139(107204). https://doi.org/10.1016/j.orgel.2025.107204
• Schiller, A., Jenatsch, S., Blülle, B., Torre Cachafeiro, M. A., Ebadi Garjan, F., Kabir, N., Othman, M., Wolff, C. M., Hessler-Wyser, A., Ballif, C., Tress, W., & Ruhstaller, B. (2024). Assessing the influence of illumination on ion conductivity in perovskite solar cells. The Journal of Physical Chemistry Letters, 15(45), 11252–11258. https://doi.org/10.1021/acs.jpclett.4c02403
• Kissling, G. P., Ruhstaller, B., & Pernstich, K. P. (2023). Measuring frontier orbital energy levels of OLED materials using cyclic voltammetry in solution. Organic Electronics, 122(106888). https://doi.org/10.1016/j.orgel.2023.106888
• Battaglia, M., Comi, E., Stadelmann, T., Hiestand, R., Ruhstaller, B., & Knapp, E. (2023). Deep ensemble inverse model for image-based estimation of solar cell parameters. APL Machine Learning, 1(3), 36108. https://doi.org/10.1063/5.0139707
• Aeberhard, U., Zeder, S. J., & Ruhstaller, B. (2022). Impact of photon recycling on the light extraction from metal halide perovskite light emitting diodes. Optical and Quantum Electronics, 54(10), 617. https://doi.org/10.1007/s11082-022-03791-9
• Aeberhard, U., Schiller, A., Masson, Y., Zeder, S. J., Blülle, B., & Ruhstaller, B. (2022). Analysis and optimization of organic tandem solar cells by full opto-electronic simulation. Frontiers in Photonics, 3(891565). https://doi.org/10.3389/fphot.2022.891565
• Regnat, M., Moon, C.-K., Jenatsch, S., Ruhstaller, B., & Pernstich, K. P. (2022). Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host. Organic Electronics, 108(106570). https://doi.org/10.1016/j.orgel.2022.106570
• Sem, S., Jenatsch, S., Stavrou, K., Danos, A., Monkman, A. P., & Ruhstaller, B. (2022). Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data. Journal of Materials Chemistry C, 10(12), 4878–4885. https://doi.org/10.1039/D1TC05594A
• Zeder, S., Ruhstaller, B., & Aeberhard, U. (2022). Assessment of photon recycling in perovskite solar cells by fully coupled optoelectronic simulation. Physical Review Applied, 17(1), 14023. https://doi.org/10.1103/PhysRevApplied.17.014023
• Comi, E., Knapp, E., Weidmann, S., Kirsch, C., Jenatsch, S., Hiestand, R., & Ruhstaller, B. (2021). Sinusoidal small-signal (AC) and steady-state (DC) analysis of large-area solar cells. Solar Energy Advances, 1(100003). https://doi.org/10.1016/j.seja.2021.100003
• Aeberhard, U., Zeder, S., & Ruhstaller, B. (2021). Reconciliation of dipole emission with detailed balance rates for the simulation of luminescence and photon recycling in perovskite solar cells. Optics Express, 29(10), 14773–14788. https://doi.org/10.1364/OE.424091
• Diethelm, M., Penninck, L., Regnat, M., Offermans, T., Zimmermann, B., Kirsch, C., Hiestand, R., Altazin, S., & Ruhstaller, B. (2020). Finite element modeling for analysis of electroluminescence and infrared images of thin-film solar cells. Solar Energy, 209, 186–193. https://doi.org/10.1016/j.solener.2020.08.058
• Zeder, S., Kirsch, C., Aeberhard, U., Blülle, B., Jenatsch, S., & Ruhstaller, B. (2020). Coupled 3D master equation and 1D drift‐diffusion approach for advanced OLED modeling. Journal of the Society for Information Display, 28(5), 440–449. https://doi.org/10.1002/jsid.903
• Jagielski, J., Solari, S. F., Jordan, L., Scullion, D., Blülle, B., Li, Y.-T., Krumeich, F., Chiu, Y.-C., Ruhstaller, B., Santos, E. J. G., & Shih, C.-J. (2020). Scalable photonic sources using two-dimensional lead halide perovskite superlattices. Nature Communications, 11(1). https://doi.org/10.1038/s41467-019-14084-3
• Jenatsch, S., Züfle, S., Blülle, B., & Ruhstaller, B. (2020). Combining steady-state with frequency and time domain data to quantitatively analyze charge transport in organic light-emitting diodes. Journal of Applied Physics, 127(3). https://doi.org/10.1063/1.5132599
• Hofmann, A. J. L., Züfle, S., Shimizu, K., Schmid, M., Wessels, V., Jäger, L., Altazin, S., Ikegami, K., Khan, M. R., Neher, D., Ishii, H., Ruhstaller, B., & Brütting, W. (2019). Dipolar doping of organic semiconductors to enhance carrier injection. Physical Review Applied, 12(6), 64052. https://doi.org/10.1103/PhysRevApplied.12.064052
• Regnat, M., Pernstich, K. P., Kim, K.-H., Kim, J.-J., Nüesch, F., & Ruhstaller, B. (2019). Routes for efficiency enhancement in fluorescent TADF exciplex host OLEDs gained from an electro‐optical device model. Advanced Electronic Materials, 6(2), 1900804. https://doi.org/10.1002/aelm.201900804
• Diethelm, M., Schiller, A., Kawecki, M., Devižis, A., Blülle, B., Jenatsch, S., Knapp, E., Grossmann, Q., Ruhstaller, B., Nüesch, F., & Hany, R. (2019). The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells. Advanced Functional Materials, 2019(1906803). https://doi.org/10.1002/adfm.201906803
• Regnat, M., Pernstich, K., & Ruhstaller, B. (2019). Influence of the bias-dependent emission zone on exciton quenching and OLED efficiency. Organic Electronics, 70, 219–226. https://doi.org/10.1016/j.orgel.2019.04.027
• Neukom, M. T., Schiller, A., Züfle, S., Knapp, E., Ávila, J., Pérez-del-Rey, D., Dreessen, C., Zanoni, K. P. S., Sessolo, M., Bolink, H. J., & Ruhstaller, B. (2019). Consistent device simulation model describing perovskite solar cells in steady-state, transient, and frequency domain. ACS Applied Materials & Interfaces, 11(26), 23320–23328. https://doi.org/10.1021/acsami.9b04991
• Jenatsch, S., Altazin, S., Will, P. A., Neukom, M. T., Knapp, E., Züfle, S., Lenk, S., Reineke, S., & Ruhstaller, B. (2018). Quantitative analysis of charge transport in intrinsic and doped organic semiconductors combining steady-state and frequency-domain data. Journal of Applied Physics, 124(105501). https://doi.org/10.1063/1.5044494
• Neukom, M., Züfle, S., Jenatsch, S., & Ruhstaller, B. (2018). Opto-electronic characterization of third-generation solar cells. Science and Technology of Advanced Materials, 19(1), 291–316. https://doi.org/10.1080/14686996.2018.1442091
• Wang, L., Jenatsch, S., Ruhstaller, B., Hinderling, C., Gesevičius, D., Hany, R., & Nüesch, F. (2018). Organic salt semiconductor with high photoconductivity and long carrier lifetime. Advanced Functional Materials, 28(16), 1705724. https://doi.org/10.1002/adfm.201705724
• Altazin, S., Kirsch, C., Knapp, E., Stous, A., & Ruhstaller, B. (2018). Refined drift-diffusion model for the simulation of charge transport across layer interfaces in organic semiconductor devices. Journal of Applied Physics, 124(13), 135501. https://doi.org/10.1063/1.5043245
• Fluhr, D., Züfle, S., Muhsin, B., Öttking, R., Seeland, M., Roesch, R., Schubert, U. S., Ruhstaller, B., Krischok, S., & Hoppe, H. (2018). Aluminum electrode insulation dynamics via interface oxidation by reactant diffusion in organic layers. Physica status solidi A, 215(23). https://doi.org/10.1002/pssa.201800474
• Diethelm, M., Penninck, L., Altazin, S., Hiestand, R., Kirsch, C., & Ruhstaller, B. (2018). Quantitative analysis of pixel crosstalk in AMOLED displays. Journal of Information Display, 19(2), 61–69. https://doi.org/10.1080/15980316.2018.1428232
• Altazin, S., Stepanova, L., Werner, J., Niesen, B., Ballif, C., & Ruhstaller, B. (2018). Design of perovskite/crystalline-silicon monolithic tandem solar cells. Optics Express, 26(10), A579–A590. https://doi.org/10.1364/OE.26.00A579
• Regnat, M., Pernstich, K. P., Züfle, S., & Ruhstaller, B. (2018). Analysis of the bias-dependent split emission zone in phosphorescent OLEDs. ACS Applied Materials & Interfaces, 10(37), 31552–31559. https://doi.org/10.1021/acsami.8b09595
• Kirsch, C., Altazin, S., Hiestand, R., Beierlein, T., Ferrini, R., Offermans, T., Pennick, L., & Ruhstaller, B. (2017). Electrothermal simulation of large-area semiconductor devices. The International Journal of Multiphysics, 11(2), 127–136. https://doi.org/10.21152/1750-9548.11.2.127
• Neukom, M., Züfle, S., Knapp, E., Makha, M., Hany, R., & Ruhstaller, B. (2017). Why perovskite solar cells with high efficiency show small IV-curve hysteresis. Solar Energy Materials & Solar Cells, 169, 159–166. https://doi.org/10.1016/j.solmat.2017.05.021
• Züfle, S., Altazin, S., Hofmann, A., Jäger, L., Neukom, M. T., Brütting, W., & Ruhstaller, B. (2017). Determination of charge transport activation energy and injection barrier in organic semiconductor devices. Journal of Applied Physics, 122(115502). https://doi.org/10.1063/1.4992041
• Züfle, S., Altazin, S., Hofmann, A., Jäger, L., Neukom, M., Schmidt, T. D., Brütting, W., & Ruhstaller, B. (2017). The use of charge extraction by linearly increasing voltage in polar organic light-emitting diodes. Journal of Applied Physics, 121(175501). https://doi.org/10.1063/1.4982903
• Altazin, S., Züfle, S., Knapp, E., Kirsch, C., Schmidt, T. D., Jäger, L., Noguchi, Y., Brütting, W., & Ruhstaller, B. (2016). Simulation of OLEDs with a polar electron transport layer. Organic Electronics, 39, 244–249. https://doi.org/10.1016/j.orgel.2016.10.014
• Züfle, S., Neukom, M. T., Altazin, S., Zinggeler, M., Chrapa, M., Offermans, T., & Ruhstaller, B. (2015). An effective area approach to model lateral degradation in organic solar cells. Advanced Energy Materials, 5(20). https://doi.org/10.1002/aenm.201500835
• Jenatsch, S., Geiger, T., Heier, J., Kirsch, C., Nüesch, F., Paracchino, A., Rentsch, D., Ruhstaller, B., Véron, A. C., & Hany, R. (2015). Influence of chemically p-type doped active organic semiconductor on the film thickness versus performance trend in cyanine/C60 bilayer solar cells. Science and Technology of Advanced Materials, 16(3). https://doi.org/10.1088/1468-6996/16/3/035003
• Knapp, E., & Ruhstaller, B. (2015). Analysis of negative capacitance and self-heating in organic semiconductor devices. Journal of Applied Physics, 117(13). https://doi.org/10.1063/1.4916981
• Jenatsch, S., Hany, R., Véron, A. C., Neukom, M., Züfle, S., Borgschulte, A., Ruhstaller, B., & Nüesch, F. (2014). Influence of molybdenum oxide interface solvent sensitivity on charge trapping in bilayer cyanine solar cells. The Journal of Physical Chemistry C, 118(30), 17036–17045. https://doi.org/10.1021/jp5005314
• Eck, M., Van Pham, C., Züfle, S., Neukom, M., Sessler, M., Scheunemann, D., Erdem, E., Weber, S., Borchert, H., Ruhstaller, B., & Krüger, M. (2014). Improved efficiency of bulk heterojunction hybrid solar cells by utilizing CdSe quantum dot–graphene nanocomposites. Physical Chemistry Chemical Physics, 16(24), 12251–12260. https://doi.org/10.1039/c4cp01566e
• Lanz, T., Bonmarin, M., Stuckelberger, M., Schlumpf, C., Ballif, C., & Ruhstaller, B. (2013). Electrothermal finite-element modeling for defect characterization in thin-film silicon solar modules. IEEE Journal of Selected Topics in Quantum Electronics, 19(5), 1–8. https://doi.org/10.1109/JSTQE.2013.2250259
• Neukom, M. T., Züfle, S., & Ruhstaller, B. (2012). Reliable extraction of organic solar cell parameters by combining steady-state and transient techniques. Organic Electronics, 13(12), 2910–2916. https://doi.org/10.1016/j.orgel.2012.09.008
• Lanz, T., Fang, L., Baik, S. J., Lim, K. S., & Ruhstaller, B. (2012). Photocurrent increase in amorphous Si solar cells by increased reflectivity of LiF/Al electrodes. Solar Energy Materials & Solar Cells, 107, 259–262. https://doi.org/10.1016/j.solmat.2012.06.044
• Knapp, E., & Ruhstaller, B. (2012). The role of shallow traps in dynamic characterization of organic semiconductor devices. Journal of Applied Physics, 112(2). https://doi.org/10.1063/1.4739303
• Knapp, E., & Ruhstaller, B. (2011). Numerical impedance analysis for organic semiconductors with exponential distribution of localized states. Applied Physics Letters, 99(9). https://doi.org/10.1063/1.3633109
• Knapp, E., & Ruhstaller, B. (2011). Numerical analysis of steady-state and transient charge transport in organic semiconductor devices. Optical and Quantum Electronics, 42(11–13), 667–677. https://doi.org/10.1007/s11082-011-9443-1
• Lanz, T., Ruhstaller, B., Battaglia, C., & Ballif, C. (2011). Extended light scattering model incorporating coherence for thin-film silicon solar cells. Journal of Applied Physics, 110(3). https://doi.org/10.1063/1.3622328
• Knapp, E., Häusermann, R., Schwarzenbach, H., & Ruhstaller, B. (2010). Numerical simulation of charge transport in disordered organic semiconductor devices. Journal of Applied Physics, 108(5), 054504–054501. https://doi.org/10.1063/1.3475505
• Häusermann, R., Knapp, E., Moos, M., Reinke, N. A., Flatz, T., & Ruhstaller, B. (2009). Coupled opto-electronic simulation of organic bulk-heterojunction solar cells : parameter extraction and sensitivity analysis. Journal of Applied Physics, 106(10), 104507. https://doi.org/10.1063/1.3259367
• Leger, J. M., Carter, S. A., & Ruhstaller, B. (2005). Recombination profiles in poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] light-emitting electrochemical cells. Journal of Applied Physics, 98(12). https://doi.org/10.1063/1.2149162
• Leger, J. M., Carter, S. A., Ruhstaller, B., Nothofer, H.-G., Scherf, U., Tillmann, H., & Hörhold, H.-H. (2003). Thickness-dependent changes in the optical properties of PPV- and PF-based polymer light emitting diodes. Physical Review B, 68(5). https://doi.org/10.1103/PhysRevB.68.054209
• Beierlein, T. A., Ruhstaller, B., Gundlach, D. J., Riel, H., Karg, S., Rost, C., & Riess, W. (2003). Investigation of internal processes in organic light-emitting devices using thin sensing layers. Synthetic Metals, 138(1–2), 213–221. https://doi.org/10.1016/S0379-6779(02)01269-9
• Riel, H., Karg, S., Beierlein, T., Ruhstaller, B., & Riess, W. (2003). Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling. Applied Physics Letters, 82(3). https://doi.org/10.1063/1.1537052
• Ruhstaller, B., Carter, S., Barth, S., Riel, H., Riess, W., & Scott, J. C. (2001). Transient and steady-state behavior of space charges in multilayer organic light-emitting diodes. Journal of Applied Physics, 89(8), 4575. https://doi.org/10.1063/1.1352027
• Ruhstaller, B., Scott, J. C., Brock, P. J., Scherf, U., & Carter, S. A. (2000). Bias-tuned reduction of self-absorption in polymer blend electroluminescence. Chemical Physics Letters, 317(3-5), 238–244. https://doi.org/10.1016/S0009-2614(99)01390-1
• Bliznyuk, V. N., Ruhstaller, B., Brock, P. J., Scherf, U., & Carter, S. A. (1999). Self-assembled nanocomposite polymer light-emitting diodes with improved efficiency and luminance. Advanced Materials, 11(15), 1257–1261. doi.org/10.1002/(SICI)1521-4095(199910)11:15<1257::AID-ADMA1257>3.0.CO;2-D
• Salis, G., Ruhstaller, B., Ensslin, K., Campman, K., Maranowski, K., & Gossard, A. C. (1998). Subband densities in quantum wells under in-plane magnetic fields. Physical Review B, 58(3), 1436–1441. https://doi.org/10.1103/PhysRevB.58.1436

Book chapters, peer-reviewed

Altazin, S., Penninck, L., & Ruhstaller, B. (2018). Outcoupling technologies : concepts, simulation, and implementation. In Handbook of organic light-emitting diodes (pp. 1–22). Springer. https://doi.org/10.1007/978-4-431-55761-6_21-1

Written conference contributions, peer-reviewed

• Krucker, T., Ballif, C., Hessler-Wyser, A., Jenatsch, S., Moia, D., Othman, M., Wolff, C., & Ruhstaller, B. (2025, December 9). The influence of SAMs on the performance and stability of perovskite solar cells [Conference poster].
• Stanzani, E., Jenatsch, S., Züfle, S., Braga, D., & Ruhstaller, B. (2025). Clear distinction between triplet‐polaron quenching (TPQ) and triplet‐triplet annihilation (TTA) in OLEDs via combined characterization and simulation [Conference poster]. SID Symposium Digest of Technical Papers, 56(1), 2241–2244. https://doi.org/10.1002/sdtp.18685
• Georgakopoulos-Paltidis, V., Stanzani, E., Jenatsch, S., Braga, D., Blülle, B., & Ruhstaller, B. (2025). Numerical analysis of trap‐induced negative capacitance in organic light‐emitting diodes [Conference paper]. SID Symposium Digest of Technical Papers, 56(S1), 638–641. https://doi.org/10.1002/sdtp.18889
• Blülle, B., Jenatsch, S., Carrillo-Nuñez, H., Züfle, S., & Ruhstaller, B. (2025, May). Exciton dynamics and degradation mechanism in TADF OLEDs assessed by modulated electroluminescence spectroscopy. SID Display Week Symposium, San José, CA, USA, 11 - 16 May 2025.
• Stanzani, E., Sem, S., Zeder, S., Georgakopoulos, V., Züfle, S., Jenatsch, S., & Ruhstaller, B. (2024). Comprehensive exploration of exciton quenching in OLEDs through combined characterization and computational simulation [Conference paper]. SID Symposium Digest of Technical Papers, 55(S1), 401–404. https://doi.org/10.1002/sdtp.17093
• Modeling the impact of the illumination geometry on the light conversion efficiency in quantum dot down-conversion films. (2024). In M. Regnat, K. Pernstich, B. Blülle, S. Jenatsch, M. K. Heo, & B. Ruhstaller (Eds.), International Conference on Display Technology (ICDT), Hefei, China, 31 March - 3 April 2024.
• Comi, E., Knapp, E., Battaglia, M., Kirsch, C., Weidmann, S., Jenatsch, S., Hiestand, R., Bonmarin, M., & Ruhstaller, B. (2022). Electro-thermal model for lock-in infrared imaging of defects in perovskite solar cells [Conference paper]. EU PVSEC Proceedings, 241–246. https://doi.org/10.4229/WCPEC-82022-2BO.8.3
• Sem, S., Jenatsch, S., Stavrou, K., Danos, A., Monkman, A. P., & Ruhstaller, B. (2022, May). Estimating non‐radiative decay rates in TADF emitters using steady‐state and transient optical data. SID Display Week Symposium, San José, CA, USA, 10-13 May 2022.
• Aeberhard, U., Zeder, S., Blülle, B., & Ruhstaller, B. (2022, May). Effects of self‐absorption and photon recycling in metal‐halide Perovskite LEDs assessed by full opto‐electronic device simulation. SID Display Week Symposium, San José, CA, USA, 10-13 May 2022.
• Aeberhard, U., Zeder, S. J., & Ruhstaller, B. (2021). Photon recycling in perovskite solar cells assessed by a detailed-balance compatible dipole emission model [Conference paper]. 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 0278–0282. https://doi.org/10.1109/PVSC43889.2021.9518720
• Aeberhard, U., Zeder, S., & Ruhstaller, B. (2021). Rigorous simulation of photon recycling effects in perovskite solar cells and LEDs [Conference paper]. 2021 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), 63–64. https://doi.org/10.1109/NUSOD52207.2021.9541505
• Regnat, M., Pernstich, K. P., Jenatsch, S., & Ruhstaller, B. (2021, September 3). Detailed explanation of the increased driving voltage in a TADF exciplex host OLED during prolonged operation via a quantitative device model. 13th Asian Conference on Organic Electronics (A-COE 2021), Online, 2-4 September 2021.
• Knapp, E., Battaglia, M., Stadelmann, T., Jenatsch, S., & Ruhstaller, B. (2021). XGBoost trained on synthetic data to extract material parameters of organic semiconductors [Conference paper]. Proceedings of the 8th SDS, 46–51. https://doi.org/10.1109/SDS51136.2021.00015
• Häusermann, R., Jenatsch, S., Leganés Carballo, J., Sharifidehsari, H., Blülle, B., Züfle, S., Liaptsis, G., & Ruhstaller, B. (2021). Optimizing charge transport and reducing excitonic loss channels in fluorescent doped TADF OLEDs [Conference paper]. SID International Symposium : Digest of Technical Papers, 52(1), 341–344. https://doi.org/10.1002/sdtp.14686
• Jenatsch, S., Züfle, S., Blülle, B., & Ruhstaller, B. (2021). Combining steady‐state, frequency, and time domain data for a comprehensive analysis of multilayer TADF OLEDs [Conference paper]. SID International Symposium : Digest of Technical Papers, 52(S1), 299–302. https://doi.org/10.1002/sdtp.14470
• Aeberhard, U., Neukom, M. T., Schiller, A., Zuefle, S., Jenatsch, S., Blülle, B., Altazin, S., Stepanova, L., Knapp, E., Kirsch, C., & Ruhstaller, B. (2020). Computational device optimization and parameter extraction for perovskite-based solar cells [Conference paper]. In A. Freundlich, M. Sugiyama, & S. Collin (Eds.), Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX (p. 112750B). SPIE. https://doi.org/10.1117/12.2545507
• Aeberhard, U., Häusermann, R., Schiller, A., Blülle, B., & Ruhstaller, B. (2020). Analysis and optimization of perovskite-silicon tandem solar cells by full opto-electronic simulation [Conference paper]. 2020 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), 37–38. https://doi.org/10.1109/NUSOD49422.2020.9217773
• Jenatsch, S., Züfle, S., Blülle, B., & Ruhstaller, B. (2020). Combining steady‐state, frequency, and time domain data for a comprehensive analysis of multilayer TADF OLEDs [Conference paper]. SID International Symposium : Digest of Technical Papers, 51(1), 634–637. https://doi.org/10.1002/sdtp.13947
• Braga, D., Jenatsch, S., Penninck, L., Hiestand, R., Diethelm, M., Altazin, S., Kirsch, C., & Ruhstaller, B. (2019). Modeling electrical and optical cross‐talk between adjacent pixels in organic light‐emitting diode displays [Conference paper]. SID International Symposium : Digest of Technical Papers, 50(1), 953–956. https://doi.org/10.1002/sdtp.13083
• Aeberhard, U., Altazin, S., Stepanova, L., Stous, A., Blulle, B., Kirsch, C., Knapp, E., & Ruhstaller, B. (2019). Numerical optimization of organic and hybrid multijunction solar cells [Conference paper]. 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC), 0105–0111. https://doi.org/10.1109/PVSC40753.2019.8980824
• Blülle, B., Altazin, S., Frouin, B., Stepanova, L., Jenatsch, S., & Ruhstaller, B. (2019). Light conversion and scattering properties of QD films for display applications : angle‐resolved optical spectroscopy and numerical simulation [Conference paper]. SID International Symposium : Digest of Technical Papers, 50(S1). https://doi.org/10.1002/sdtp.13512
• Knapp, E., & Ruhstaller, B. (2015). Analysis of self-heating and negative capacitance in organic semiconductors devices [Conference paper]. International Symposium of the Society for Information Display (SID), San Jose, USA, 21 May - 5 June 2015, 46, 778–781. https://doi.org/10.1002/sdtp.10224
• Altazin, S., Reynaud, C., Mayer, U. M., Lanz, T., Lapagna, K., Knaack, R., Penninck, L., Kirsch, C., Pernstich, K. P., Harkema, S., Hermes, D., & Ruhstaller, B. (2015). Simulations, measurements and optimization of OLEDs with scattering layer [Conference paper]. SID International Symposium : Digest of Technical Papers, 46, 564–567. https://doi.org/10.1002/sdtp.10478
• Altazin, S., Lapagna, K., Lanz, T., Kirsch, C., Knaack, R., & Ruhstaller, B. (2014). Design tool for light scattering enhancement in OLEDs [Conference paper]. Digest of Technical Papers, 45(1), 576–579. https://doi.org/10.1002/j.2168-0159.2014.tb00151.x
• Lanz, T., Bonmarin, M., Ruhstaller, B., & Offermans, T. (2014). Failure modes in all-plastic encapsulated flexible organic solar modules : experimental and computational analysis [Conference poster]. In M. Graetzel & M. Nazeeruddin (Eds.), Proceedings of the 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14). nanoGe.
• Altazin, S., Perucco, B., Pagan, N., Lapagna, K., Lanz, T., Knaack, R., Knapp, E., & Ruhstaller, B. (2013). Multi-scale modeling of organic light-emitting devices [Conference paper]. SID International Symposium: Digest of Technical Papers, 44, 1486–1489. https://doi.org/10.1002/j.2168-0159.2013.tb06529.x

Other publications

• Zeder, S., Aeberhard, U., Ruhstaller, B., & Tress, W. (2023). Photon recycling in metal halide perovskites : its modeling and relevance to optoelectronic devices. In J. P. Martínez-Pastor, P. P. Boix, & G. Xing (Eds.), Metal Halide Perovskites for Generation, Manipulation and Detection of Light (pp. 507–545). Elsevier. https://doi.org/10.1016/B978-0-323-91661-5.00001-5
• Aeberhard, U., Hiestand, R., & Ruhstaller, B. (2020). Simulation of beam shaping by micro‐textures for curved displays [Conference paper]. SID International Symposium : Digest of Technical Papers, 51(1), 957–959. https://doi.org/10.1002/sdtp.14030
• Jenatsch, S., Züfle, S., Will, P. A., Bülle, B., Neukom, M., Lenk, S., Reineke, S., Braga, D., Domanski, K., & Ruhstaller, B. (2019). Quantitative analysis of charge transport in single‐carrier devices and OLEDs combining DC and AC data [Conference paper]. SID International Symposium : Digest of Technical Papers, 50(1), 1895–1898. https://doi.org/10.1002/sdtp.13333
• Jenatsch, S., Regnat, M., Hany, R., Diethelm, M., Nüesch, F., & Ruhstaller, B. (2018). Time-dependent p–i–n structure and emission zone in sandwich-type light-emitting electrochemical cells. ACS Photonics, 5(4), 1591–1598. https://doi.org/10.1021/acsphotonics.8b00047
• Penninck, L., Diethelm, M., Altazin, S., Hiestand, R., Kirsch, C., & Ruhstaller, B. (2018). Modelling crosstalk through common semiconductor layers in AMOLED displays. Journal of the Society for Information Display, 26(9), 546–554. https://doi.org/10.1002/jsid.671
• Losio, P. A., Feurer, T., Buecheler, S., & Ruhstaller, B. (2016). Evolutionary optimization of TCO/mesh electrical contacts in CIGS solar cells [Conference paper]. Proceedings of the EU PVSEC 2016 (Munich), 1237–1240. https://doi.org/10.21256/zhaw-1987
• Altazin, S., Züfle, S., Knapp, E., Kirsch, C., Schmidt, T. D., Jäger, L., Brütting, W., & Ruhstaller, B. (2016). On the role of polar molecules and the barrier for charge injection in OLEDs [Conference paper]. In F. So, C. Adachi, & J.-J. Kim (Eds.), Proceedings of SPIE (Vol. 9941). https://doi.org/10.1117/12.2238620
• Altazin, S., Züfle, S., Knapp, E., Kirsch, C., Schmidt, T. D., Jäger, L., Brütting, W., & Ruhstaller, B. (2016). Combining simulators and experiments to study the impact of polar OLED materials [Conference paper]. SID Symposium Digest of Technical Papers, 47, 1750–1753. https://doi.org/10.1002/sdtp.11059
• Knapp, E., & Ruhstaller, B. (2015). Analysis of self-heating and trapping in organic semiconductor devices [Conference paper]. In F. So, C. Adachi, & J.-J. Kim (Eds.), Organic Light Emitting Materials and Devices XIX (Vol. 9566). SPIE. https://doi.org/10.1117/12.2185712
• Altazin, S., Lanz, T., Lapagna, K., & Ruhstaller, B. (2013). Impact of light scattering for efficiency enhancement in organic solar cells. 28th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Paris, France, 30 September - 4 October 2013. https://doi.org/10.21256/zhaw-1994
• Ruhstaller, B., Flatz, T., Sartoris, G., Kiy, M., Beierlein, T., Winnewisser, C., Pretot, R., Chebotareva, N., & v.d. Schaaf, P. (2006). Optoelectronic OLED modeling for characterization and optimization. Organic Electronics Conference and Exhibition, Frankfurt, Germany, 25-27 September 2006.
• Ruhstaller, B., Beierlein, T. A., Gmür, R., Karg, S., Riel, H., Sartoris, G., Schwarzenbach, H., & Riess, W. (2004). Parameter extraction and validation of an electronic and optical model for organic light-emitting devices [Conference paper]. In G. Wachutka & G. Schrag (Eds.), Simulation of Semiconductor Processes and Devices 2004 (Vol. 12, pp. 157–161). Springer. https://doi.org/10.21256/zhaw-1995
• Ruhstaller, B., & Schwarzenbach, H. U. (2004). Virtuelle Experimente für die Ingenieurausbildung. ZHWInfo, 19, 45.
• Hocker, T., Sartoris, G., Ruhstaller, B., Haller, T., & Schwarzenbach, H. (2003). Mikro- und Nanotechnologie am Center for Computational Physics. ZHWInfo, 17.
• Ruhstaller, B., Beierlein, T. A., Riel, H., Karg, S., Scott, J. C., & Riess, W. (2003). Simulating electronic and optical processes in multilayer organic light-emitting devices. IEEE Journal of Selected Topics in Quantum Electronics, 9(3), 723–731. https://doi.org/10.1109/JSTQE.2003.818852
• Beierlein, T. A., Riel, H., Ruhstaller, B., Hofmann, H., Crone, B. K., Karg, S., & Riess, W. (2002). Tuning of electrical and optical properties of organic LEDs using combinatorial device fabrication. Journal of the Society for Information Display, 10(4), 311–315. https://doi.org/10.1889/1.1827883

Oral conference contributions and abstracts

• Jenatsch, S., Aeberhard, U., Comi, E. L., Moia, D., Diethelm, M., van den Heuvel, R., Mossig, N., Knapp, E., & Ruhstaller, B. (2025, July 21). Assessing the origins and impacts of inhomogeneities in perovskite solar cells by imaging techniques and device simulations. Proceedings of the MATSUS Fall 2025 Conference. https://doi.org/10.29363/nanoge.matsusfall.2025.213
• Torre Cachafeiro, M., Narbey, S., Ruhstaller, B., Nüesch, F., & Tress, W. (2025, April 24). Ionic screening and its impact on J-V curves in carbon-based perovskite solar cells. Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25). https://doi.org/10.29363/nanoge.nipho.2025.004
• Braga, D., Comi, E. L., Knapp, E., Jenatsch, S., Battaglia, M., Torre, M., Kirsch, C., & Ruhstaller, B. (2025, February 17). Investigating inhomogeneities and turn-on dynamics in carbon-based perovskite solar cells using advanced imaging and simulation techniques. Proceedings of the International Conference on Hybrid and Organic Photovoltaics. https://doi.org/10.29363/nanoge.hopv.2025.025
• Schiller, A., Ruhstaller, B., Jenatsch, S., Torre Cachafeiro, M. A., Ebadi, F., Kabir, N., Blülle, B., Wolff, C. M., Hessler-Wyser, A., Ballif, C., Tress, W., & Othman, M. (2024, December 16). Assessing the influence of illumination on ion conductivity in perovskite solar cells. Proceedings of the MATSUS Spring 2025 Conference. https://doi.org/10.29363/nanoge.matsusspring.2025.418
• Comi, E., Jenatsch, S., Blülle, B., Battaglia, M., Torre Cachafeiro, M. A., Kirsch, C., Hiestand, R., Aeberhard, U., Ruhstaller, B., & Knapp, E. (2023). Investigation of time and location dependent variations in electroluminescence images of perovskite solar cells [Conference presentation]. Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, 020077–020001.
• Regnat, M., Jenatsch, S., Züfle, S., Pernstich, K. P., & Ruhstaller, B. (2021, August). Advanced characterization and device simulation towards better understanding of OLED degradation mechanisms. 21st International Meeting on Information Display (IMID 2021), Seoul, Korea, 25-27 August 2021.
• Lanz, T., Boccard, M., Despeisse, M., Battaglia, C., Haug, F.-J., Ballif, C., & Ruhstaller, B. (2013, May). Light harvesting analysis of novel thin-film electrode architectures in microcrystalline silicon solar cells with hybrid Fourier and geometrical optics simulator. European Materials Research Society (E-MRS) 2013 Spring Meeting, Strasbourg, France, 27-31 May 2013.

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