Stefaan De Wolf

Solar Cells


KAUST,Thuwal, Saudi Arabia,Belgian






Stefaan De Wolf's expertise lies in the science and technology of photovoltaics for terrestrial applications. His research focuses on the fabrication of high-efficiency silicon-based solar cells, with specific attention to the fundamental understanding of interface structures and electrical contact formation, relevant to solar cells and electronic devices.
He is also interested in new device architectures and applications, such as photovoltaics for hot climates and silicon-based multi-junction solar cells, aimed at the improved utilization of the full solar spectrum for electricity generation. A prime example of these devices are perovskite-silicon tandem solar cells. He has been a clarivate highly cited scientist since 2019.




Abstract for Presentation

Outdoor stability of perovskite/silicon tandem solar cells



In the presentation I will discuss the multiple ways how monolithic perovskite/silicon can be fabricated, built from textured silicon heterojunction solar cells, with an emphasis on solution processing of the perovskite top cell [1]. Bulk and contact passivation of the perovskite are instrumental to obtain a high performance, which can be obtained through molecular additive engineering [2,3,4]. This will be followed by a discussion about the outdoor performance of such tandems and the need for robust and perovskite-compatible encapsulation to do so [5]. I will then move on to discuss reliability aspects of such tandems under accelerated degradation tests such as damp-heat testing, as well as possible mechanical failure due to top-contact delamination [6]. I will conclude my talk with arguing how bifacial perovskite/silicon tandems aid in improved performance as well as stability, thanks to their reliance on narrow-bandgap perovskites for optimal performance [7].




[1] Y. Hou. E Aydin, M. De Bastiani, C. Xiao, F.H. Isikgor, D.-J. Xue, B. Chen, H. Chen, B. Bahrami, A.H. Chowdury, A. Johnston, S.-W. Baek, Z. Huang, M. Wei, Y. Dong, J. Troughton, R. Jalmood, A.J. Mirabelli, T. Allen, E. Van Kerschaver, M.I. Saidaminov, D. Baran, Q. Qiao, K. Zhu, S. De Wolf, and E.H. Sargent, Science 367, 1135 (2020).
[2] F.H. Isikgor, F. Furlan, J. Liu, E. Ugur, M.K. Eswaran, A.S. Subbiah, E. Yengel, M. De Bastiani, G.T. Harrison, S. Zhumagali, C.T. Howells, E. Aydin, M. Wang, N. Gasparini, T.G. Allen, A. Rehman, E. Van Kerschaver, D. Baran, I. McCulloch, T.D. Anthopoulos, U. Schwingenschlogl, F. Laquai, and S. De Wolf, Joule 5, 1566 (2021).
[3] S. Zhumagali, F.H. Isikgor, P. Maity, J. Yin, E. Ugur, M. De Bastiani, E. Aydin, G.T. Harrison, J. Troughton, A.S. Subbiah, J. Liu, T. Allen, A. ur Rehman, D. Baran, O.F. Mohammed, and S. De Wolf, Adv. Energy Mater. 11, 2101662 (2021).
[4] J. Liu, E. Aydin, J. Yin, M. De Bastiani, F.H. Isikgor, A.u. Rehman, E. Yengel, E. Ugur, G.T. Harrison, Y. Gao, M. Wang, j.I. Khan, M. Babics, T.G. Allen, A.S. Subbiah, K. Zhu, X. Zheng, W. Yan, F. Xu, M.F. Salvador, O.M. Bakr, M. Lanza, T.D. Anthopoulos, O.F. Mohammed, F. Laquai, S. De Wolf, Joule 5, 3169 (2021).
[5] E. Aydin, T.G. Allen, M. De Bastiani, L. Xu, J. Avila, M. Salvador, E. Van Kerschaver, and S. De Wolf, Nature Energy 5, 851 (2020).
[6] M. De Bastiani, G. Armaroli, R. Jalmood, L. Ferlauto, X. Li, R. Tao, G.T. Harrison, M. Babics, E. Aydin, T.G. Allen, C. Combe, T. Kramer, G. Lubineau, D. Cavalcoli, and S De Wolf, ACS Energy Lett. 7, 827 (2022).
[7] M. De Bastiani, A.J. Mirabelli, Y. Hou, F. Grota, E. Aydin, T.G. Allen, J. Troughton, A.S. Subbiah, F.H. Isikgor, J. Liu, L. Xu, B. Chen, E. Van Kerschaver, D. Baran, M.F. Salvador, U.W. Paetzold, E.H. Sargent, and S. De Wolf, Nature Energy 6, 167 (2021).