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

被引：225

作者：

Zhang, Bingjuan ^{[1
]}

Su, Jie ^{[1
]}

Guo, Xing ^{[1
]}

Zhou, Long ^{[1
,2
]}

Lin, Zhenhua ^{[1
]}

Feng, Liping ^{[3
]}

Zhang, Jincheng ^{[1
]}

Chang, Jingjing ^{[1
]}

Hao, Yue ^{[1
]}

机构：

[1] Xidian Univ, State Key Discipline Lab Wide Band Gap Semicond T, Shaanxi Joint Key Lab Graphene, Adv Interdisciplinary Res Ctr Flexible Elect,Sch, 2 South Taibai Rd, Xian 710071, Peoples R China

[2] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA

[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

来源：

ADVANCED SCIENCE | 2020年 / 7卷 / 11期

基金：

中国国家自然科学基金;

关键词：

buffer layers; contact engineering; lattice mismatches; NiO; perovskite solar cells; ORGANOMETAL TRIHALIDE PEROVSKITE; DOPED NICKEL-OXIDE; HALIDE PEROVSKITES; THERMAL-EXPANSION; HIGH-PERFORMANCE; LAYER; COEFFICIENT; EXTRACTION; STABILITY; DYNAMICS;

D O I：

10.1002/advs.201903044

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 NiOx 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 NiOx 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 NiOx/perovskite interface and provides a new strategy for interface optimization.

引用

页数：10

共 55 条

[31] Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystals [J].