14November2019

Nano-Micro Letters

Optimizing the Performance of CsPbI3-based Perovskite Solar Cells via Doping a ZnO Electron Transport Layer Coupled with Interface Engineering

Man Yue1, #, Jie Su1, #, *, Peng Zhao1, Zhenhua Lin1, Jincheng Zhang1, Jingjing Chang1, *, Yue Hao1

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Nano-Micro Lett. (2019) 11: 91

First Online: 18 October 2019 (Article)

DOI:10.1007/s40820-019-0320-y

*Corresponding author. E-mail: sujie@xidian.edu.cn (Jie Su); jjingchang@xidian.edu.cn (Jingjing Chang)

 

Abstract

 


Toc

Interface engineering has been regarded as an effective and non-invasive means to optimize the performance of perovskite solar cells (PSCs). Here, doping engineering of a ZnO electron transport layer (ETL) and CsPbI3/ZnO interface engineering via introduction of an interfacial layer are employed to improve the performances of CsPbI3-based PSCs. The results show that when introducing a TiO2 buffer layer while increasing the ZnO layer doping concentration, the open circuit voltage, power conversion efficiency, and fill factor of the CsPbI3-based PSCs can be improved to 1.31 V, 21.06%, and 74.07%, respectively, which are superior to those of PSCs only modified by the TiO2 buffer layer or high concentration doping of ZnO layer. On the one hand, the buffer layer relieves the band bending and structural disorder of CsPbI3. On the other hand, the increased doping concentration of the ZnO layer improves the conductivity of the TiO2/ZnO bilayer ETL because of the strong interaction between the TiO2 and ZnO layers. However, such phenomena are not observed for those of a PCBM/ZnO bilayer ETL because of the weak interlayer interaction of the PCBM/ZnO interface. These results provide a comprehensive understanding of the CsPbI3/ZnO interface and suggest a guideline to design high-performance PSCs.


 

Keywords

All-inorganic CsPbI3 perovskites; Interface engineering; Doping; ZnO; Simulation

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