@article{Li2023, 
author = {Xin Li and Guibin Shen and Xin Ren Ng and Zhiyong Liu and Yun Meng and Yongwei Zhang and Cheng Mu and Zhi Gen Yu and Fen Lin},
title = {Thermally Evaporated ZnSe for Efficient and Stable Regular/Inverted Perovskite Solar Cells by Enhanced Electron Extraction},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {5},
keywords = {high efficiency, long-term stability, planar regular/inverted perovskite solar cells, thermal evaporation, ZnSe electron transport layer},
url = {https://www.sciopen.com/article/10.1002/eem2.12439},
doi = {10.1002/eem2.12439},
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 ℃ for 10:00 h. This highlights one of the best results among universal ETLs in both regular and inverted perovskite photovoltaics.}
}