1. Thermally Evaporated ZnSe for Efficient and Stable Regular/Inverted Perovskite Solar Cells by Enhanced Electron Extraction.
- Author
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Li, Xin, Shen, Guibin, Ng, Xin Ren, Liu, Zhiyong, Meng, Yun, Zhang, Yongwei, Mu, Cheng, Yu, Zhi Gen, and Lin, Fen
- Subjects
SOLAR cells ,ZINC selenide ,PEROVSKITE ,ELECTRON transport ,ELECTRONS - Abstract
Electron transport layers (ETLs) are crucial for achieving efficient and stable planar perovskite solar cells (PSCs). Reports on versatile inorganic ETLs using a simple film fabrication method and applicability for both low‐cost planar regular and inverted PSCs with excellent efficiencies (>22%) and high stability are very limited. Herein, we employ a novel inorganic ZnSe as ETL for both regular and inverted PSCs to improve the efficiency and stability using a simple thermal evaporation method. The TiO2‐ZnSe‐FAPbI3 heterojunction could be formed, resulting in an improved charge collection and a decreased carrier recombination further proved through theoretical calculations. The optimized regular PSCs based on TiO2/ZnSe have achieved 23.25% efficiency with negligible hysteresis. In addition, the ZnSe ETL can also effectively replace the unstable bathocuproine (BCP) in inverted PSCs. Consequently, the ZnSe‐based inverted device realizes a champion efficiency of 22.54%. Moreover, the regular device comprising the TiO2/ZnSe layers retains 92% of its initial PCE after 10:00 h under 1 Sun continuous illumination and the inverted device comprising the C60/ZnSe layers maintains over 85% of its initial PCE at 85 °C for 10:00 h. This highlights one of the best results among universal ETLs in both regular and inverted perovskite photovoltaics. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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