In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability

被引：73

作者：

Hu, Wanpei ^{[1
]}

Wen, Zhiling ^{[1
]}

Yu, Xin ^{[1
]}

Qian, Peisen ^{[1
]}

Lian, Weitao ^{[1
]}

Li, Xingcheng ^{[1
]}

Shang, Yanbo ^{[1
]}

Wu, Xiaojun ^{[1
]}

Chen, Tao ^{[1
]}

Lu, Yalin ^{[1
]}

Wang, Mingtai ^{[2
]}

Yang, Shangfeng ^{[1
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Anhui Lab Adv Photon Sci & Technol, CAS Key Lab Mat Energy Convers,Dept Mat Sci & Eng, Hefei 230026, Peoples R China

[2] Chinese Acad Sci, Inst Solid State Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China

来源：

ADVANCED SCIENCE | 2021年 / 8卷 / 10期

基金：

中国国家自然科学基金;

关键词：

electron transport layer; fluorination; interface binding; perovskite solar cells; titanium oxide;

D O I：

10.1002/advs.202004662

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Low-temperature solution-processed TiO2 nanocrystals (LT-TiO2) have been extensively applied as electron transport layer (ETL) of perovskite solar cells (PSCs). However, the low electron mobility, high density of electronic trap states, and considerable photocatalytic activity of TiO2 result in undesirable charge recombination at the ETL/perovskite interface and notorious instability of PSCs under ultraviolet (UV) light. Herein, LT-TiO2 nanocrystals are in situ fluorinated via a simple nonhydrolytic method, affording formation of TiF bonds, and consequently increase electron mobility, decrease density of electronic trap states, and inhibit photocatalytic activity. Upon applying fluorinated TiO2 nanocrystals (F-TiO2) as ETL, regular-structure planar heterojunction PSC (PHJ-PSC) achieves a champion power conversion efficiency (PCE) of 22.68%, which is among the highest PCEs for PHJ-PSCs based on LT-TiO2 ETLs. Flexible PHJ-PSC devices based on F-TiO2 ETL exhibit the best PCE of 18.26%, which is the highest value for TiO2-based flexible devices. The bonded F atoms on the surface of TiO2 promote the formation of PbF bonds and hydrogen bonds between F- and FA/MA organic cations, reinforcing interface binding of perovskite layer with TiO2 ETL. This contributes to effective passivation of the surface trap states of perovskite film, resulting in enhancements of device efficiency and stability especially under UV light.

引用

页数：11