NiO/Perovskite Heterojunction Contact Engineering for Highly Efficient and Stable Perovskite Solar Cells

Overview

Journal Adv Sci (Weinh)

Specialty Biomedical Engineering

Date 2020 Jun 16

PMID 32537396

Citations 14

Authors

Bingjuan Zhang

Jie Su

Xing Guo

Long Zhou

Zhenhua Lin

Liping Feng

Jincheng Zhang

Jingjing Chang

Yue Hao

Affiliations

Soon will be listed here.

Abstract

Recent research shows that the interface state in perovskite solar cells is the main factor which affects the stability and performance of the device, and interface engineering including strain engineering is an effective method to solve this issue. In this work, a CsBr buffer layer is inserted between NiO hole transport layer and perovskite layer to relieve the lattice mismatch induced interface stress and induce more ordered crystal growth. The experimental and theoretical results show that the addition of the CsBr buffer layer optimizes the interface between the perovskite absorber layer and the NiO hole transport layer, reduces interface defects and traps, and enhances the hole extraction/transfer. The experimental results show that the power conversion efficiency of optimal device reaches up to 19.7% which is significantly higher than the efficiency of the device without the CsBr buffer layer. Meanwhile, the device stability is also improved. This work provides a deep understanding of the NiO /perovskite interface and provides a new strategy for interface optimization.

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