High-efficiency and ultraviolet stable carbon-based CsPbIBr2 solar cells from single crystal three-dimensional anatase titanium dioxide nanoarrays with ultraviolet light shielding function

Yu Jing; Xiao Liu; Deng Wang; Ruoshui Li; Yuan Xu; Zhongliang Yan; Weihai Sun; Jihuai Wu; Zhang Lan

doi:10.1016/j.jcis.2022.02.049

High-efficiency and ultraviolet stable carbon-based CsPbIBr₂ solar cells from single crystal three-dimensional anatase titanium dioxide nanoarrays with ultraviolet light shielding function

J Colloid Interface Sci. 2022 Jun 15:616:201-209. doi: 10.1016/j.jcis.2022.02.049. Epub 2022 Feb 17.

Authors

Yu Jing¹, Xiao Liu¹, Deng Wang¹, Ruoshui Li¹, Yuan Xu¹, Zhongliang Yan¹, Weihai Sun¹, Jihuai Wu¹, Zhang Lan²

Affiliations

¹ Engineering Research Center of Environment-Friendly Functional Materials, Ministry of EducationHuaqiao University, Xiamen 361021, PR China; Fujian Key Laboratory of Photoelectric Functional Materials and, Huaqiao University, Xiamen 361021, PR China; College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, PR China.
² Engineering Research Center of Environment-Friendly Functional Materials, Ministry of EducationHuaqiao University, Xiamen 361021, PR China; Fujian Key Laboratory of Photoelectric Functional Materials and, Huaqiao University, Xiamen 361021, PR China; College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, PR China. Electronic address: lanzhang@hqu.edu.cn.

PMID: 35203033
DOI: 10.1016/j.jcis.2022.02.049

Abstract

TiO₂ is commonly used to prepare electron transport layers (ETLs) in perovskite solar cells (PSCs). However, conventional TiO₂ ETLs suffer from low electron mobility and charge recombination. Here, we report the direct growth of TiO₂ ETLs on fluorine doped conductive (FTO) glasses with titanium tetrafluoride (TiF₄) as the reactant by hydrothermal method. The TiO₂ ETLs have pure anatase phase, single crystal structure and three-dimensional (3D) nanoarrays morphology. This 3D-TiO₂ ETLs mainly consist of thermodynamically stable surfaces {101} and more reactive surfaces {001}. Compared with the conventional TiO₂ ETLs, the 3D-TiO₂ ETLs can effectively optimize energy level matching and charge transfer dynamics. The special morphology of 3D-TiO₂ ETLs can well assist to form high quality CsPbIBr₂ with larger crystal grains. The champion CsPbIBr₂ PSC with 3D-TiO₂ ETL achieves an efficiency as high as 10.65%, which is equal to the one with hole-transport and Au electrode structure (10.79%) and much higher than the pristine one (7.16%) with the conventional TiO₂ ETL. Furthermore, the 3D-TiO₂ ETLs show ultraviolet (UV) shielding function, which can effectively overcome the UV instability defect of conventional TiO₂ ETLs and obviously enhance UV stability of CsPbIBr₂ and the corresponding PSCs. Therefore, the 3D-TiO₂ ETLs can be good candidates for preparing high-efficiency and UV stable carbon-based CsPbIBr₂ PSCs.

Keywords: All-inorganic perovskite solar cells; Anatase TiO(2) nanoarrays; CsPbIBr(2); Electron transport layer; Ultraviolet shielding function.