How precursor concentration affects perovskite film thickness and optoelectronic properties

Lukasz Przypis^a, Artur P. Herman^b, Robert Kudrawiec^b, Konrad Wojciechowski^a^,^c, Wladek Walukiewicz^a^,^d

^aSaule Research Institute, Wroclaw Technology Park, 11 Dunska Street, Sigma Building, 54-130 Wrocław, Poland

^bDepartment of Semiconductor Materials Engineering, Wrocław University of Science and Technology, Wyspiańskiego 27, Wrocław 50-370, Poland

^cSaule Technologies Ltd., Wroclaw Technology Park, 11 Dunska Street, Sigma Building, 54-130 Wrocław, Poland

^dMaterials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)

València, Spain, 2022 May 19th - 25th

Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson

Poster, Lukasz Przypis, 284
Publication date: 20th April 2022

ePoster:

Perovskite solar cells (PSC) have received a lot of interest as one of the most favorable emerging photovoltaic (PV) technology. The lead halide perovskite materials are excellent optoelectronic properties, such as suitable direct bandgap, high absorbance coefficient, long carrier mobility, high defect tolerance, and intrinsic low trap density. The facile fabrication methods have made this technology favorable for commercial development. The perovskite solar cells have achieved a power conversion efficiency (PCE) reaching 25.6%.[1] Progress in perovskite PV technology obtained via comprehensive research on the composition and effects of active layers in solar cells. Photoactive layer thickness is a crucial parameter for the optimization of photovoltaic PCE. The correlation between charge extraction and recombination hasn't fully understood in PSC characterization. In our research, we tried to understand these phenomena. We examined the impact of solution concentration on the photovoltaic and the material properties of perovskite solar cells. We found conditions where the in MAPbI3 perovskite thickness layer is linear correlated with precursor concentration. The perovskite film became smoother when precursor concentration decreased, which induced favorable carrier recombination in the perovskite layer. The perovskite solution was deposited by a one-step spin-coating technique followed by thermal annealing to form the perovskite active layer.

References:

[1] 1. Jeong, J. ; Kim, M.; Seo, J. ; Lu, H . ; Ahlawat, P.; Mishra, A.; Yang, Y.; Hope, M. A. ; Eickemeyer, F. T. ; Kim, M. ; Yoon, Y. J.; Choi, I. W.; Darwich, B. P.; Choi, S. J.; Jo, Y.; Lee, J. H.; Walker, B.; Zakeeruddin, S. M; Emsley, L.; Rothlisberger, U.; Hagfeldt, A.; Kim, D. S.; Grätzel, M.; Kim, J. Y. Nature 2021, 592, 381-385.

Acknowledgements:

The project has received funding from National Science Centre (Poland) through the NCN OPUS grant UMO-2019/33/B/ ST3/03021.

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