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Issue 31, 2019
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Band engineering at the interface of all-inorganic CsPbI2Br solar cells

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Abstract

An all-inorganic CsPbI2Br perovskite with excellent phase stability and thermal stability has been considered to be a promising candidate for photovoltaic application. However, low efficiency and high moisture sensitivity hinder its advancement. In this work, we exploit 4-bromobenzylamine hydriodate post-treatment on CsPbI2Br thin films to assist the extraction of holes and to block the flow of electrons to the hole transport layer through band engineering at the CsPbI2Br bulk/surface. We found through depth profile analysis that a small amount of BrBeAI permeates into the CsPbI2Br bulk and mainly locates at the CsPbI2Br grain boundaries. This treatment leads to an improved short-circuit current of CsPbI2Br solar cells and an enhanced efficiency from 13.10% to 14.63%. In addition, the incorporation of the hydrophobic organic component into perovskite films effectively enhances the moisture resistance. This result proves that utilizing organic ammonium salt to improve the performance of the device through band alignment is an effective strategy for all-inorganic perovskite solar cell optimization.

Graphical abstract: Band engineering at the interface of all-inorganic CsPbI2Br solar cells

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Supplementary files

Article information


Submitted
29 Apr 2019
Accepted
08 Jul 2019
First published
09 Jul 2019

Nanoscale, 2019,11, 14553-14560
Article type
Communication

Band engineering at the interface of all-inorganic CsPbI2Br solar cells

J. Zhuang, Y. Wei, Y. Luan, N. Chen, P. Mao, S. Cao and J. Wang, Nanoscale, 2019, 11, 14553
DOI: 10.1039/C9NR03638E

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