In Situ Surface Fluorination of TiO2 Nanocrystals Reinforces Interface Binding of Perovskite Layer for Highly Efficient Solar Cells with Dramatically Enhanced Ultraviolet-Light Stability
文献类型：期刊论文
| 作者 | Hu, Wanpei1; Wen, Zhiling1; Yu, Xin1; Qian, Peisen1; Lian, Weitao1; Li, Xingcheng1; Shang, Yanbo1; Wu, Xiaojun1; Chen, Tao1; Lu, Yalin1 |
| 刊名 | ADVANCED SCIENCE
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000628344000001 |
| 出版者 | WILEY |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China |
| 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). |
入库方式： OAI收割
来源：合肥物质科学研究院
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