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

Single crystal anatase 3D-TiO2 nanoarrys electron transport layer (3D-TiO2 ETL) is in-situ grown on the surface of fluorine doped conductive (FTO) glasses. The 3D-TiO2 ETL can improve the electron transport, reduce the charge recombination and enhance the quality of CsPbIBr2 film. Moreover, it has a...

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Bibliographic Details
Published in:Journal of colloid and interface science 2022-06, Vol.616, p.201-209
Main Authors: Jing, Yu, Liu, Xiao, Wang, Deng, Li, Ruoshui, Xu, Yuan, Yan, Zhongliang, Sun, Weihai, Wu, Jihuai, Lan, Zhang
Format: Article
Language:English
Subjects:
All-inorganic perovskite solar cells
Anatase TiO2 nanoarrays
CsPbIBr2
Electron transport layer
Ultraviolet shielding function
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Summary:Single crystal anatase 3D-TiO2 nanoarrys electron transport layer (3D-TiO2 ETL) is in-situ grown on the surface of fluorine doped conductive (FTO) glasses. The 3D-TiO2 ETL can improve the electron transport, reduce the charge recombination and enhance the quality of CsPbIBr2 film. Moreover, it has a good shielding perfomance on ultraviolet (UV), which can effectively overcome the UV instablity of PSCs induced by the conventional TiO2 ETLs. [Display omitted] 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.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2022.02.049