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
a Saule Research Institute, Wroclaw Technology Park, 11 Dunska Street, Sigma Building, 54-130 Wrocław, Poland
b Department of Semiconductor Materials Engineering, Wrocław University of Science and Technology, Wyspiańskiego 27, Wrocław 50-370, Poland
c Saule Technologies Ltd., Wroclaw Technology Park, 11 Dunska Street, Sigma Building, 54-130 Wrocław, Poland
d Materials 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

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.

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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