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

doi:10.1002/advs.202004662

	In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability
	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
刊名	ADVANCED SCIENCE
	2021-03-13
关键词	electron transport layer fluorination interface binding perovskite solar cells titanium oxide
DOI	10.1002/advs.202004662
通讯作者	Yang, Shangfeng(sfyang@ustc.edu.cn)
英文摘要	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.
资助项目	National Key Research and Development Program of China[2017YFA0402800] ; National Natural Science Foundation of China[51925206] ; National Natural Science Foundation of China[U1932214]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	WILEY
WOS记录号	WOS:000628344000001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/121092]
专题	中国科学院合肥物质科学研究院
通讯作者	Yang, Shangfeng
作者单位	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
推荐引用方式 GB/T 7714	Hu, Wanpei,Wen, Zhiling,Yu, Xin,et al. In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability[J]. ADVANCED SCIENCE,2021.
APA	Hu, Wanpei.,Wen, Zhiling.,Yu, Xin.,Qian, Peisen.,Lian, Weitao.,...&Yang, Shangfeng.(2021).In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability.ADVANCED SCIENCE.
MLA	Hu, Wanpei,et al."In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability".ADVANCED SCIENCE (2021).