Affiliation:
1. MOE Key Laboratory of Low‐grade Energy Utilization Technologies and Systems School of Energy & Power Engineering Chongqing University Chongqing 400044 China
2. R&D Center JA Solar Holdings Co., Ltd. Yangzhou 225131 China
3. Institute of Geology FRC Komi Science Center Ural Branch Russian Academy of Sciences Syktyvkar 167982 Russia
4. School of New Energy and Materials Southwest Petroleum University Chengdu 610500 China
Abstract
AbstractDifferent facets in perovskite crystals exhibit distinct atomic arrangements, influencing their electronic, physical, and chemical properties. Perovskite films incorporating tin oxide (SnO2) as the electron transport layer face challenges in facet regulation. This study reveals that tea saponin (TS), a natural compound serves as a SnO2 modifier, facilitates optimal growth of perovskite crystals on the (111) facet. The modification promotes preferential crystal orientation through hydrogen bond and Lewis coordination. TS forms a chelate with SnO2, resulting in a smoother film and n‐type doping, leading to improved carrier extraction and reduced defects. The TS‐modified perovskite solar cells achieve a champion efficiency of 24.2%, leveraging from an obvious enhancement of open‐circuit voltage (Voc) of 1.18 V and fill factor (FF) of 82.8%. The devices also demonstrate enhanced humidity tolerance and storage stability, ensuring improved stability without encapsulation.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Chongqing Postdoctoral Science Foundation
Science Fund for Distinguished Young Scholars of Chongqing Municipality
Chongqing Municipal Youth Science and Technology Talent Training Project
Natural Science Foundation of Chongqing Municipality
Key Technologies Research and Development Program