Issue

Vol. 11 (2019)

Surface Passivation of Perovskite Solar Cells Toward Improved Efficiency and Stability

https://doi.org/10.1007/s40820-019-0282-0
Zhiqi Li
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Jiajun Dong
State Key Laboratory of Superhard Materials, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Chunyu Liu
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Jiaxin Guo
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Liang Shen
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China
Wenbin Guo
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People’s Republic of China

Corresponding Author: Wenbin Guo

guowb@jlu.edu.cn

Nano-Micro Letters, Vol. 11 (2019), Article Number: 50

Abstract

The advancement of perovskite solar cells (PVSCs) 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.


Highlights:


1 The TTC layer was efficiently deposited at the grain boundary of the perovskite, which passivated the grain surface and grain boundary, thereby decreasing the interfacial recombination of the perovskite solar cells.
2 The hydrophobic small molecule TTC on the perovskite films forms a water-resistant layer that protects the perovskite from water damage.

Keywords

Perovskite solar cells Surface passivation Charge transport Surface defect
Li, Zhiqi, Jiajun Dong, Chunyu Liu, Jiaxin Guo, Liang Shen, and Wenbin Guo. 2019. “Surface Passivation of Perovskite Solar Cells Toward Improved Efficiency and Stability”. Nano-Micro Letters 11 (June):50. https://doi.org/10.1007/s40820-019-0282-0.
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