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Dr. Wolfgang Tress

Dr. Wolfgang Tress

Dr. Wolfgang Tress

ZHAW School of Engineering
Forschungsschwerpunkt Organic Electronics & Photovoltaics

+41 (0) 58 934 42 23

Personal profile

Position at the ZHAW

Senior Lecturer

Expertise and research interests

Organic Electronics, Perovskite solar cells, Device physics, Optoelectronic characterization, Device simulation, Semiconductors, Mixed ionic-electronic conductors

Professional milestones

Postdoc at Linköping University 2013
Postdoc at EPFL 2014
Ambizione Energy fellow, EPFL 2017
Marie-Curie fellow, LMU, Munich 2019

Membership of networks


Articles in scientific journal, peer-reviewed
Other publications
Oral conference contributions and abstracts
Publications before appointment at the ZHAW

Publications in peer-reviewed scientific Journals

1. Reviews

8. Xiang, W. & Tress, W.* Review on Recent Progress of All‐Inorganic Metal Halide Perovskites and Solar Cells. Adv. Mater. 1902851 (2019). doi:10.1002/adma.201902851
7. Wang, F., Bai, S., Tress, W., Hagfeldt, A. & Gao, F. Defects engineering for high-performance perov-skite solar cells. npj Flexible Electronics 2, 22 (2018).
6. Mingorance, A., Xie, H., Kim, H.-S., Wang, Z., Balsells, M., Morales‐Melgares, A., Domingo, N., Kazuteru, N., Tress, W., Fraxedas, J., Vlachopoulos, N., Hagfeldt, A. & Lira‐Cantu, M. Interfacial Engi-neering of Metal Oxides for Highly Stable Halide Perovskite Solar Cells. Advanced Materials Interfaces 5, 1800367 (2018).
5. Correa-Baena, J.-P., Saliba, M., Buonassisi, T., Grätzel, M., Abate, A., Tress, W. & Hagfeldt, A. Prom-ises and challenges of perovskite solar cells. Science 358, 739–744 (2017).
4. Tress, W. Perovskite Solar Cells on the Way to Their Radiative Efficiency Limit – Insights Into a Suc-cess Story of High Open-Circuit Voltage and Low Recombination. Adv. Energy Mater. 7, 1602358 (2017). Invited Progress Report
3. Tress, W. Metal Halide Perovskites as Mixed Electronic–Ionic Conductors: Challenges and Opportuni-ties—From Hysteresis to Memristivity. J. Phys. Chem. Lett. 3106–3114 (2017). Invited Perspective [OA]
2. Correa-Baena, J.-P., Abate, A., Saliba, M., Tress, W., Jacobsson, T. J., Grätzel, M. & Hagfeldt, A. The rapid evolution of highly efficient perovskite solar cells. Energy Environ. Sci. 10, 710-727 (2017).
1. Tang, Z., Tress, W. & Inganas, O. Light trapping in thin film organic solar cells. Materials Today 17, 389–396 (2014). [OA]

2. Research articles

78. Jahanbakhshi, F., Mladenović, M., Kneschaurek, E., Merten, L., Gélvez-Rueda, M. C., Ahlawat, P., Li, Y., Dučinskas, A., Hinderhofer, A., Dar, M. I., Tress, W., Carlsen, B., Ummadisingu, A., Zakeeruddin, S. M., Hagfeldt, A., Schreiber, F., Grozema, F. C., Rothlisberger, U., Milić, J. V. & Graetzel, M. Unravelling the structural complexity and photophysical properties of adamantyl-based layered hybrid perovskites. J. Mater. Chem. A doi:10.1039/D0TA05022A (2020)
77.Gélvez‐Rueda, M. C., Ahlawat, P., Merten, L., Jahanbakhshi, F., Mladenović, M., Hinderhofer, A., Dar, M. I., Li, Y., Dučinskas, A., Carlsen, B., Tress, W., Ummadisingu, A., Zakeeruddin, S. M., Schreiber, F., Hagfeldt, A., Rothlisberger, U., Grozema, F. C., Milić, J. V. & Graetzel, M. Formamidinium-Based Dion-Jacobson Layered Hybrid Perovskites: Structural Complexity and Optoelectronic Properties. Advanced Functional Materials, 2003428 (2020)
76. Sadegh, F., Akin, S., Moghadam, M., Mirkhani, V., Ruiz‒Preciado, M. A., Wang, Z., Tavakoli, M. M., Graetzel, M., Hagfeldt, A. & Tress, W.* Highly efficient, stable and hysteresis‒less planar perovskite solar cell based on chemical bath treated Zn2SnO4 electron transport layer. Nano Energy 75, 105038 (2020).
75. Wang, Z. S., Ebadi, F., Carlsen, B., Choy, W. C. H. & Tress, W.* Transient Photovoltage Measure-ments on Perovskite Solar Cells with Varied Defect Concentrations and Inhomogeneous Recombination Rates. Small Methods, 2000290 (2020)
74. Khenkin, M. V. et al. Consensus statement for stability assessment and reporting for perovskite photovoltaics based on ISOS procedures. Nat Energy 5, 35–49 (2020).
73. Zhang, J., Wang, Z., Mishra, A., Yu, M., Shasti, M., Tress, W., Kubicki, D. J., Avalos, C. E., Lu, H., Liu, Y., Carlsen, B. I., Agarwalla, A., Wang, Z., Xiang, W., Emsley, L., Zhang, Z., Grätzel, M., Guo, W. & Hag-feldt, A. Intermediate Phase Enhances Inorganic Perovskite and Metal Oxide Interface for Efficient Photovoltaics. Joule 4, 222–234 (2020).
72. Xiang, W., Wang, Z., Kubicki, D. J., Wang, X., Tress, W., Luo, J., Zhang, J., Hofstetter, A., Zhang, L., Emsley, L., Grätzel, M. & Hagfeldt, A. Ba-induced phase segregation and band gap reduction in mixed-halide inorganic perovskite solar cells. Nat Commun 10, 1–8 (2019). [OA] doi: 10.1038/s41467-019-12678-5
71. Tress, W.*, Domanski, K., Carlsen, B., Agarwalla, A., Alharbi, E. A., Graetzel, M. & Hagfeldt, A. Per-formance of perovskite solar cells under simulated temperature-illumination real-world operating con-ditions. Nat. Energy 4, 568–574 (2019). doi:10.1038/s41560-019-0400-8
70. Ebadi, F., Taghavinia, N., Mohammadpour, R., Hagfeldt, A., & Tress, W.* Origin of Apparent Light-Enhanced and Negative Capacitance in Perovskite Solar Cells. Nat. Commun. 10, 1574 (2019). [OA] doi: 10.1038/s41467-019-09079-z
69. Hill, R. B. M., Turren-Cruz, S.-H., Pulvirenti, F., Tress, W. R., Wieghold, S., Sun, S., Nienhaus, L., Bawendi, M., Buonassisi, T., Barlow, S., Hagfeldt, A., Marder, S. R. & Correa-Baena, J.-P. Phosphonic Acid Modification of the Electron Selective Contact: Interfacial Effects in Perovskite Solar Cells. ACS Appl. Energy Mater. 2, 2402–2408 (2019).
68. Gegevičius, R., Franckevičius, M., Chmeliov, J., Tress, W. & Gulbinas, V. Electroluminescence Dy-namics in Perovskite Solar Cells Reveals Giant Overshoot Effect. J. Phys. Chem. Lett. 10, 1779–1783 (2019).
67. P. Mora-Fuentes, J., Cortizo-Lacalle, D., Collavini, S., Strutyński, K., R. Tress, W., Saliba, M., M. Zakeeruddin, S., Kosta, I., Melle-Franco, M., Grätzel, M., Luis Delgado, J. & Mateo-Alonso, A. A partially-planarised hole-transporting quart- p -phenylene for perovskite solar cells. Journal of Materi-als Chemistry C 7, 4332–4335 (2019).
66. Yavari, M., Ebadi, F., Meloni, S., Wang, Z., Yang, T. C.-J., Sun, S., Schwartz, H., Wang, Z., Niesen, B., Durantini, J. E., Rieder, P., Tvingstedt, K., Buonassisi, T., Choy, W. C. H., Filippetti, A., Dittrich, T., Olt-hof, S., Baena, J. P. C. & Tress, W.* How far does the defect tolerance of lead-halide perovskites range? The example of Bi impurities introducing efficient recombination centers. J. Mater. Chem. A (2019). doi:10.1039/C9TA01744E
65. Alharbi, E. A., Dar, M. I., Arora, N., Alotaibi, M. H., Alzhrani, Y. A., Yadav, P., Tress, W., Alyamani, A., Albadri, A., Zakeeruddin, S. M., & Graetzel, M. Perovskite Solar Cells Yielding Reproducible Photo-voltage of 1.20 V. Research (2019). doi:10.1155/2019/8474698
64. Valero, S., Collavini, S., Völker, S. F., Saliba, M., Tress, W., Zakeeruddin, S. M., Grätzel, M. & Delga-do, J. L. Dopant-Free Hole-Transporting Polymers for Efficient and Stable Perovskite Solar Cells. Mac-romolecules (2019). doi:10.1021/acs.macromol.9b00165
63. Xiang, W., Wang, Z., Kubicki, D. J., Tress, W., Luo, J., Prochowicz, D., Akin, S., Emsley, L., Zhou, J., Dietler, G., Grätzel, M. & Hagfeldt, A. Europium-Doped CsPbI2Br for Stable and Highly Efficient Inor-ganic Perovskite Solar Cells. Joule 3, 205-214 (2019).
62. Tavakoli, M. M., Tress, W., Milić, J., Kubicki, D., Emsley, L. & Grätzel, M. Addition of Adaman-tylammonium Iodide to Hole Transport Layers Enables Highly Efficient and Electroluminescent Perov-skite Solar Cells. Energy Environ. Sci. 11, 3310-3320 (2018).
61. Tang, Z., Wang, J., Melianas, A., Wu, Y., Kroon, R., Li, W., Ma, W., Andersson, M. R., Ma, Z., Cai, W., Tress, W.* & Inganäs, O. Relating open-circuit voltage losses to the active layer morphology and contact selectivity in organic solar cells. J. Mater. Chem. A 6, 12574–12581 (2018).
60. Qian, D., Zheng, Z., Yao, H., Tress, W., Hopper, T. R., Chen, S., Li, S., Liu, J., Chen, S., Zhang, J., Liu, X.-K., Gao, B., Ouyang, L., Jin, Y., Pozina, G., Buyanova, I. A., Chen, W. M., Inganäs, O., Coropceanu, V., Bredas, J.-L., Yan, H., Hou, J., Zhang, F., Bakulin, A. A. & Gao, F. Design rules for minimizing voltage losses in high-efficiency organic solar cells. Nature Materials 17, 703–709 (2018).
59. Weber, S., Hermes, I. M., Cruz, S. H. T., Gort, C., Bergmann, V. W., Gilson, L., Hagfeldt, A., Grätzel, M., Tress, W. & Berger, R. How the Formation of Interfacial Charge Causes Hysteresis in Perovskite Solar Cells. Energy Environ. Sci. 9, 2404-2413 (2018).
58. Yavari, M., Mazloum-Ardakani, M., Gholipour, S., Tavakoli, M. M., Taghavinia, N., Hagfeldt, A. & Tress, W.* Reducing Surface Recombination by a Poly(4-vinylpyridine) Interlayer in Perovskite Solar Cells with High Open-Circuit Voltage and Efficiency. ACS Omega 3, 5038–5043 (2018).
57. Saygili, Y., Turren-Cruz, S.-H., Olthof, S., Saes, B. W. H., Pehlivan, I. B., Saliba, M., Meerholz, K., Edvinsson, T., Zakeeruddin, S. M., Grätzel, M., Correa-Baena, J.-P., Hagfeldt, A., Freitag, M. & Tress, W.* Planar Perovskite Solar Cells with High Open-Circuit Voltage Containing a Supramolecular Iron Complex as Hole Transport Material Dopant. ChemPhysChem 19, 1363-1370 (2018).
56. Halvani Anaraki, E., Kermanpur, A., Mayer, M. T., Steier, L., Ahmed, T., Turren-Cruz, S.-H., Seo, J., Luo, J., Zakeeruddin, S. M., Tress, W., Edvinsson, T., Grätzel, M., Hagfeldt, A. & Correa-Baena, J.-P. Low-Temperature Nb-Doped SnO2 Electron-Selective Contact Yields over 20% Efficiency in Planar Per-ovskite Solar Cells. ACS Energy Lett. 3, 773–778 (2018).
55. Yavari, M., Mazloum-Ardakani, M., Gholipour, S., Marinova, N., Delgado, J. L., Turren-Cruz, S.-H., Domanski, K., Taghavinia, N., Saliba, M., Grätzel, M., Hagfeldt, A. & Tress, W.* Carbon Nanoparticles in High-Performance Perovskite Solar Cells. Adv. Energy Mater. 8, 1702719 (2018).
54. Tress, W.*, Yavari, M., Domanski, K., Yadav, P., Niesen, B., Baena, J. P. C., Hagfeldt, A. & Graetzel, M. Interpretation and evolution of open-circuit voltage, recombination, ideality factor and subgap defect states during reversible light-soaking and irreversible degradation of perovskite solar cells. Energy Environ. Sci. 11, 151–165 (2018).
53. Turren-Cruz, S.-H., Saliba, M., T. Mayer, M., Juárez-Santiesteban, H., Mathew, X., Nienhaus, L., Tress, W., P. Erodici, M., Sher, M.-J., G. Bawendi, M., Grätzel, M., Abate, A., Hagfeldt, A. & Correa-Baena, J.-P. Enhanced charge carrier mobility and lifetime suppress hysteresis and improve efficiency in planar perovskite solar cells. Energy & Environmental Science 11, 78–86 (2018).
52. Collavini, S., Saliba, M., Tress, W., Holzhey, P. J., Völker, S. F., Domanski, K., Turren-Cruz, S. H., Ummadisingu, A., Zakeeruddin, S. M., Hagfeldt, A., Grätzel, M. & Delgado, J. L. Poly(ethylene glycol)–[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Re-duced Hysteresis. ChemSusChem 11, 1032–1039 (2018).
51. Domanski, K., Alharbi, E. A., Hagfeldt, A., Grätzel, M. & Tress, W.* Systematic investigation of the impact of operation conditions on the degradation behaviour of perovskite solar cells. Nature Energy 3, 61–67 (2018).
50. Gholipour, S., Ali, A. M., Correa-Baena, J.-P., Turren-Cruz, S.-H., Tajabadi, F., Tress, W., Taghavinia, N., Grätzel, M., Abate, A., De Angelis, F., Gaggioli, C. A., Mosconi, E., Hagfeldt, A. & Saliba, M. Globu-larity-Selected Large Molecules for a New Generation of Multication Perovskites. Adv. Mater. 29, 1702005 (2017).
49. Ummadisingu, A., Steier, L., Seo, J.-Y., Matsui, T., Abate, A., Tress, W. & Grätzel, M. The effect of illumination on the formation of metal halide perovskite films. Nature 545, 208 (2017).
48. Correa-Baena, J.-P., Tress, W.*, Domanski, K., Anaraki, E. H., Turren-Cruz, S.-H., Roose, B., Boix, P. P., Grätzel, M., Saliba, M., Abate, A. & Hagfeldt, A. Identifying and suppressing interfacial recombina-tion to achieve high open-circuit voltage in perovskite solar cells. Energy Environ. Sci. 10, 1207–1212 (2017).
47. Aitola, K., Domanski, K., Correa-Baena, J.-P., Sveinbjörnsson, K., Saliba, M., Abate, A., Grätzel, M., Kauppinen, E., Johansson, E. M. J., Tress, W., Hagfeldt, A. & Boschloo, G. High Temperature-Stable Perovskite Solar Cell Based on Low-Cost Carbon Nanotube Hole Contact. Adv. Mater. 29, 1606398 (2017).
46. Correa-Baena, J.-P., Turren-Cruz, S.-H., Tress, W., Hagfeldt, A., Aranda, C., Shooshtari, L., Bisquert, J. & Guerrero, A. Changes from Bulk to Surface Recombination Mechanisms between Pristine and Cy-cled Perovskite Solar Cells. ACS Energy Lett. 2, 681–688 (2017).
45. Domanski, K., Roose, B., Matsui, T., Saliba, M., Turren-Cruz, S.-H., Correa-Baena, J.-P., Carmona, C. R., Richardson, G., Foster, J. M., Angelis, F. D., Ball, J. M., Petrozza, A., Mine, N., Nazeeruddin, M. K., Tress, W., Grätzel, M., Steiner, U., Hagfeldt, A. & Abate, A. Migration of cations induces reversible performance losses over day/night cycling in perovskite solar cells. Energy Environ. Sci. 10, 604–613 (2017).
44. Tress, W.*, Beyer, B., Ashari Astani, N., Gao, F., Meloni, S. & Rothlisberger, U. Extended Intermo-lecular Interactions Governing Photocurrent–Voltage Relations in Ternary Organic Solar Cells. J. Phys. Chem. Lett. 7, 3936–3944 (2016).
43. Anaraki, E. H., Kermanpur, A., Steier, L., Domanski, K., Matsui, T., Tress, W., Saliba, M., Abate, A., Grätzel, M., Hagfeldt, A. & Correa-Baena, J.-P. Highly efficient and stable planar perovskite solar cells by solution-processed tin oxide. Energy Environ. Sci. 9, 3128–3134 (2016).
42. Saliba, M., Matsui, T., Domanski, K., Seo, J.-Y., Ummadisingu, A., Zakeeruddin, S. M., Correa-Baena, J.-P., Tress, W., Abate, A., Hagfeldt, A. & Grätzel, M. Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance. Science 354, 206–209 (2016). [OA]
41. Matsui, T., Petrikyte, I., Malinauskas, T., Domanski, K., Daskeviciene, M., Steponaitis, M., Gratia, P., Tress, W., Correa-Baena, J.-P., Abate, A., Hagfeldt, A., Grätzel, M., Nazeeruddin, M. K., Getautis, V. & Saliba, M. Additive-Free Transparent Triarylamine-Based Polymeric Hole-Transport Materials for Stable Perovskite Solar Cells. ChemSusChem 9, 2567–2571 (2016).
40. Jacobsson, T. J., Correa-Baena, J.-P., Halvani Anaraki, E., Philippe, B., Stranks, S. D., Bouduban, M. E. F., Tress, W., Schenk, K., Teuscher, J., Moser, J.-E., Rensmo, H. & Hagfeldt, A. Unreacted PbI2 as a Double-Edged Sword for Enhancing the Performance of Perovskite Solar Cells. J. Am. Chem. Soc. 138, 10331–10343 (2016).
39. Bergqvist, J., Tress, W., Forchheimer, D., Melianas, A., Tang, Z., Haviland, D. & Inganäs, O. New method for lateral mapping of bimolecular recombination in thin-film organic solar cells. Prog. Photo-volt: Res. Appl. 24, 1096–1108 (2016).
38. Tress, W.*, Correa Baena, J. P., Saliba, M., Abate, A. & Graetzel, M. Inverted Current–Voltage Hys-teresis in Mixed Perovskite Solar Cells: Polarization, Energy Barriers, and Defect Recombination. Adv. Energy Mater. 6, 1600396 (2016).
37. Gholipour, S., Correa-Baena, J.-P., Domanski, K., Matsui, T., Steier, L., Giordano, F., Tajabadi, F., Tress, W., Saliba, M., Abate, A., Morteza Ali, A., Taghavinia, N., Grätzel, M. & Hagfeldt, A. Highly Effi-cient and Stable Perovskite Solar Cells based on a Low-Cost Carbon Cloth. Adv. Energy Mater. 6, 1601116 (2016).
36. Correa-Baena, J.-P., Anaya, M., Lozano, G., Tress, W., Domanski, K., Saliba, M., Matsui, T., Jacob-sson, T. J., Calvo, M. E., Abate, A., Grätzel, M., Míguez, H. & Hagfeldt, A. Unbroken Perovskite: Inter-play of Morphology, Electro-optical Properties, and Ionic Movement. Adv. Mater. 28, 5031–5037 (2016).
35. Domanski, K., Correa-Baena, J.-P., Mine, N., Nazeeruddin, M. K., Abate, A., Saliba, M., Tress, W., Hagfeldt, A. & Grätzel, M. Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perov-skite Solar Cells. ACS Nano 10, 6306–6314 (2016).
34. Schwarze, M., Tress, W., Beyer, B., Gao, F., Scholz, R., Poelking, C., Ortstein, K., Günther, A. A., Kasemann, D., Andrienko, D. & Leo, K. Band structure engineering in organic semiconductors. Science 352, 1446–1449 (2016). [OA]
33. Saliba, M., Matsui, T., Seo, J.-Y., Domanski, K., Correa-Baena, J.-P., Nazeeruddin, M. K., Zakeerud-din, S. M., Tress, W., Abate, A., Hagfeldt, A. & Grätzel, M. Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency. Energy Environ. Sci. 9, 1989–1997 (2016). [OA]
32. Jacobsson, T. J., Tress, W., Correa-Baena, J.-P., Edvinsson, T. & Hagfeldt, A. Room Temperature as a Goldilocks Environment for CH3NH3PbI3 Perovskite Solar Cells: The Importance of Temperature on Device Performance. J. Phys. Chem. C 120, 11382–11393 (2016).
31. Arora, N., Dar, M. I., Hezam, M., Tress, W., Jacopin, G., Moehl, T., Gao, P., Aldwayyan, A. S., De-veaud, B., Grätzel, M. & Nazeeruddin, M. K. Photovoltaic and Amplified Spontaneous Emission Studies of High‐Quality Formamidinium Lead Bromide Perovskite Films. Advanced Functional Materials 26, 2846–2854 (2016).
30. Meloni, S., Moehl, T., Tress, W., Franckevičius, M., Saliba, M., Lee, Y. H., Gao, P., Nazeeruddin, M. K., Zakeeruddin, S. M., Rothlisberger, U. & Graetzel, M. Ionic polarization-induced current-voltage hys-teresis in CH3NH3PbX3 perovskite solar cells. Nat Commun 7, 10334 (2016). [OA]
29. Bi, D., Tress, W.*, Dar, M. I., Gao, P., Luo, J., Renevier, C., Schenk, K., Abate, A., Giordano, F., Bae-na, J.-P. C., Decoppet, J.-D., Zakeeruddin, S. M., Nazeeruddin, M. K., Grätzel, M. & Hagfeldt, A. Effi-cient luminescent solar cells based on tailored mixed-cation perovskites. Science Advances 2, e1501170 (2016). [OA]
28. Domanski, K., Tress, W.*, Moehl, T., Saliba, M., Nazeeruddin, M. K. & Graetzel, M. Working Princi-ples of Perovskite Photodetectors: Analyzing the Interplay Between Photoconductivity and Voltage-Driven Energy-Level Alignment. Advanced Functional Materials 25, 6936–6947 (2015).
27. Baena, J. P. C., Steier, L., Tress, W., Saliba, M., Neutzner, S., Matsui, T., Giordano, F., Jacobsson, T. J., Kandada, A. R. S., Zakeeruddin, S. M., Petrozza, A., Abate, A., Nazeeruddin, M. K., Grätzel, M. & Hag-feldt, A. Highly efficient planar perovskite solar cells through band alignment engineering. Energy Envi-ron. Sci. 8, 2928–2934 (2015). [OA]
26. Marinova, N., Tress, W.*, Humphry-Baker, R., Dar, M. I., Bojinov, V., Zakeeruddin, S. M., Nazee-ruddin, M. K. & Grätzel, M. Light Harvesting and Charge Recombination in CH3NH3PbI3 Perovskite So-lar Cells Studied by Hole Transport Layer Thickness Variation. ACS Nano 9, 4200–4209 (2015).
25. Gao, F., Tress, W., Wang, J. & Inganas, O. Temperature Dependence of Charge Carrier Generation in Organic Photovoltaics. Physical Review Letters 114, 128701 (2015).
24. Tang, Z., Liu, B., Melianas, A., Bergqvist, J., Tress, W., Bao, Q., Qian, D., Inganäs, O. & Zhang, F. A New Fullerene‐Free Bulk‐Heterojunction System for Efficient High‐Voltage and High‐Fill Factor Solu-tion‐Processed Organic Photovoltaics. Advanced Materials 27, 1900–1907 (2015).
23. Tress, W.*, Marinova, N., Moehl, T., Zakeeruddin, S. M., Nazeeruddin, M. K. & Grätzel, M. Under-standing the rate-dependent J–V hysteresis, slow time component, and aging in CH3NH3PbI3 perov-skite solar cells: the role of a compensated electric field. Energy Environ. Sci. 8, 995–1004 (2015).
22. Tress, W.*, Marinova, N., Inganäs, O., Nazeeruddin, M. K., Zakeeruddin, S. M. & Graetzel, M. Pre-dicting the Open-Circuit Voltage of CH3NH3PbI3 Perovskite Solar Cells Using Electroluminescence and Photovoltaic Quantum Efficiency Spectra: the Role of Radiative and Non-Radiative Recombination. Adv. Energy Mater. 5, 140812 (2015).
21. Fischer, J., Widmer, J., Kleemann, H., Tress, W., Koerner, C., Riede, M., Vandewal, K. & Leo, K. A charge carrier transport model for donor-acceptor blend layers. Journal of Applied Physics 117, 45501 (2015).
20. Moule, A. J., Jung, M.-C., Rochester, C. W., Tress, W., LaGrange, D., Jacobs, I. E., Li, J., Mauger, S. A., Rail, M. D., Lin, O., Bilsky, D. J., Qi, Y., Stroeve, P., Berben, L. A. & Riede, M. Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control. Journal of Materials Chemistry C 3, 2664–2676 (2015).
19. Tang, Z., Tress, W., Bao, Q., Jafari, M. J., Bergqvist, J., Ederth, T., Andersson, M. R. & Inganas, O. Improving Cathodes with a Polymer Interlayer in Reversed Organic Solar Cells. Advanced Energy Mate-rials 4, 1400643 (2014).
18. Fischer, J., Tress, W., Kleemann, H., Widmer, J., Leo, K. & Riede, M. Exploiting diffusion currents at Ohmic contacts for trap characterization in organic semiconductors. Organic Electronics 15, 2428–2432 (2014).
17. Bergqvist, J., Lindqvist, C., Backe, O., Ma, Z., Tang, Z., Tress, W., Gustafsson, S., Wang, E., Olsson, E., Andersson, M. R., Inganas, O. & Muller, C. Sub-glass transition annealing enhances polymer solar cell performance. Journal of Materials Chemistry A 2, 6146–6152 (2014).
16. Widmer, J., Fischer, J., Tress, W., Leo, K. & Riede, M. Electric potential mapping by thickness varia-tion: A new method for model-free mobility determination in organic semiconductor thin films. Organ-ic Electronics 14, 3460–3471 (2013). [OA]
15. Tang, Z., Elfwing, A., Bergqvist, J., Tress, W. & Inganas, O. Light Trapping with Dielectric Scatterers in Single- and Tandem-Junction Organic Solar Cells. Advanced Energy Materials 3, 1606–1613 (2013).
14. Tress, W.* & Inganas, O. Simple experimental test to distinguish extraction and injection barriers at the electrodes of (organic) solar cells with S-shaped current-voltage characteristics. Solar Energy Mate-rials and Solar Cells 117, 599–603 (2013).
13. Tietze, M. L., Tress, W., Pfuetzner, S., Schuenemann, C., Burtone, L., Riede, M., Leo, K., Vandewal, K., Olthof, S., Schulz, P. & Kahn, A. Correlation of open-circuit voltage and energy levels in zinc-phthalocyanine: C-60 bulk heterojunction solar cells with varied mixing ratio. Physical Review B 88, 85119 (2013).
12. Tress, W.*, Corvers, S., Leo, K. & Riede, M. Investigation of Driving Forces for Charge Extraction in Organic Solar Cells: Transient Photocurrent Measurements on Solar Cells Showing S-Shaped Current-Voltage Characteristics. Advanced Energy Materials 3, 873–880 (2013).
11. Tress, W.*, Leo, K. & Riede, M. Photoconductivity as loss mechanism in organic solar cells. Physica Status Solidi-Rapid Research Letters 7, 401–405 (2013).
10. Tress, W.*, Merten, A., Furno, M., Hein, M., Leo, K. & Riede, M. Correlation of Absorption Profile and Fill Factor in Organic Solar Cells: The Role of Mobility Imbalance. Advanced Energy Materials 3, 631–638 (2013).
9. Tress, W.*, Leo, K. & Riede, M. Dominating recombination mechanisms in organic solar cells based on ZnPc and C-60. Applied Physics Letters 102, 163901 (2013).
8. Tress, W.*, Leo, K. & Riede, M. Optimum mobility, contact properties, and open-circuit voltage of organic solar cells: A drift-diffusion simulation study. Phys. Rev. B 85, 155201 (2012).
7. Tress, W.*, Leo, K. & Riede, M. Effect of concentration gradients in ZnPc:C-60 bulk heterojunction organic solar cells. Solar Energy Materials and Solar Cells 95, 2981–2986 (2011).
6. Tress, W.*, Leo, K. & Riede, M. Influence of Hole-Transport Layers and Donor Materials on Open-Circuit Voltage and Shape of I-V Curves of Organic Solar Cells. Advanced Functional Materials 21, 2140–2149 (2011).
5. Meiss, J., Hermenau, M., Tress, W., Schuenemann, C., Selzer, F., Hummert, M., Alex, J., Lackner, G., Leo, K. & Riede, M. Tetrapropyl-tetraphenyl-diindenoperylene derivative as a green absorber for high-voltage stable organic solar cells. Physical Review B 83, 165305 (2011).
4. Tress, W.*, Petrich, A., Hummert, M., Hein, M., Leo, K. & Riede, M. Imbalanced mobilities causing S-shaped IV curves in planar heterojunction organic solar cells. Applied Physics Letters 98, 63301 (2011).
3. Tress, W.*, Pfuetzner, S., Leo, K. & Riede, M. Open circuit voltage and IV curve shape of ZnPc:C60 solar cells with varied mixing ratio and hole transport layer. Journal of Photonics for Energy 1, 11114 (2011).
2. Olthof, S., Tress, W., Meerheim, R., Luessem, B. & Leo, K. Photoelectron spectroscopy study of sys-tematically varied doping concentrations in an organic semiconductor layer using a molecular p-dopant. Journal of Applied Physics 106, 103711 (2009).
1. Riede, M., Mueller, T., Tress, W., Schueppel, R. & Leo, K. Small-molecule solar cells - status and per-spectives. Nanotechnology 19, 424001 (2008).

3. Monographs

Organic Solar Cells – theory, experiment, and device simulation
W. Tress, Springer Series in Materials Science 208, Springer (Dec. 2014)
Device Physics of Organic Solar Cells, Dissertation, TU Dresden (2012)

4. Peer-reviewed conference proceedings

2. Tress, W. & Graetzel, M. Understanding the limit and potential in emerging perovskite solar cells. in 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM) 15–16 (2017). doi:10.1109/EDTM.2017.7947503
1. Tress, W.*, Marinova, N., Inganas, O., Nazeeruddin, M. K., Zakeeruddin, S. M. & Graetzel, M. The role of the hole-transport layer in perovskite solar cells - reducing recombination and increasing ab-sorption. 2014 IEEE 40th Photovoltaic Specialist Conference (pvsc) 1563–1566 (2014).

5. Contributions to Books

Current-Voltage Analysis: Lessons to be Learned from Hysteresis
Unger, E., Czudek, A., Kim, H., Tress, W. in Characterization Techniques for Perovskite Solar Cell Mate-rials and Devices, Elsevier (2020)

Maximum efficiency and open-circuit voltage of perovskite solar cells
Tress, W. in Organic-Inorganic Halide Perovskite Photovoltaics, Springer (Jul. 2016)