13December2019

Nano-Micro Letters

Surface Passivation of Perovskite Solar Cells toward Improved Efficiency and Stability

Zhiqi Li1, Jiajun Dong2, Chunyu Liu1, Jiaxin Guo1, Liang Shen1, Wenbin Guo1, *

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Nano-Micro Lett. (2019) 11: 50

First Online: 07 June 2019 (Article)

DOI:10.1007/s40820-019-0282-0

*Corresponding author. E-mail: guowb@jlu.edu.cn (W.B. Guo)

 

Abstract

 


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The advancement of perovskite solar cell (PVSC) technology toward commercialized promotion needs high efficiency and optimum stability. By introducing a small molecular material such as tetratetracontane (TTC, CH3(CH2)42CH3) at the fullerene (C60)/perovskite interface of planar p-i-n PVSCs, we significantly reduced the interfacial traps, thereby suppressing electron recombination and facilitating electron extraction. Consequently, an improved efficiency of 20.05% was achieved with a high fill factor of 79.4%, which is one of the best performances for small molecular-modified PVSCs. Moreover, the hydrophobic TTC successfully protects the perovskite film from water damage. As a result, we realized a better long-term stability that maintains 87% of the initial efficiency after continuous exposure for 200 h in air.


 

Keywords

Perovskite solar cells; Passivation; Charge transport; Surface defect; Stability

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