Potassium thiocyanate additive for PEDOT:PSS layer to fabricate efficient tin-based perovskite solar cells

Xu Zhao; Shoudeng Zhong; Shuqi Wang; Shaozhen Li; Sujuan Wu

doi:10.1007/s12613-023-2738-y

Volume 30 Issue 12

Dec. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(12): 2451-2458

Xu Zhao, Shoudeng Zhong, Shuqi Wang, Shaozhen Li, and Sujuan Wu, Potassium thiocyanate additive for PEDOT:PSS layer to fabricate efficient tin-based perovskite solar cells, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2451-2458. https://doi.org/10.1007/s12613-023-2738-y

Cite this article as:

Xu Zhao, Shoudeng Zhong, Shuqi Wang, Shaozhen Li, and Sujuan Wu, Potassium thiocyanate additive for PEDOT:PSS layer to fabricate efficient tin-based perovskite solar cells, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2451-2458. https://doi.org/10.1007/s12613-023-2738-y

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Research Article

Potassium thiocyanate additive for PEDOT:PSS layer to fabricate efficient tin-based perovskite solar cells

+ Author Affiliations

Corresponding authors:
Shaozhen Li E-mail: origen2003@whpu.edu.cn

Sujuan Wu E-mail: sujwu@scnu.edu.cn
Received: 2 April 2023; Revised: 6 August 2023; Accepted: 8 September 2023; Available online: 9 September 2023

Abstract

Abstract

The commercialized poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) is usually used as hole transport layers (HTLs) in tin-based perovskite solar cells (TPSCs). However, the further development has been restricted due to the acidity that could damage the stability of TPSCs. Although the PEDOT:PSS solution can be diluted by water to decrease acidity and reduce the cost of device fabrication, the electrical conductivity will decrease obviously in diluted PEDOT:PSS solution. Herein, potassium thiocyanate (KSCN) is selected to regulate the properties of PEDOT:PSS HTLs from the diluted PEDOT:PSS aqueous solution by water with a volume ratio of 1:1 to prepare efficient TPSCs. The effect of KSCN addition on the structure and photoelectrical properties of PEDOT:PSS HTLs and TPSCs have been systematically studied. At the optimal KSCN concentration, the TPSCs based on KSCN-doped PEDOT:PSS HTLs (KSCN-PSCs) demonstrate the champion power conversion efficiency (PCE) of 8.39%, while the reference TPSCs only show a champioan PCE of 6.70%. The further analysis demonstrates that the KSCN additive increases the electrical conductivity of HTLs prepared by the diluted PEDOT:PSS solution, improves the microstructure of perovskite film, and inhibits carrier recombination in TPSCs, leading to the reduced hysteresis effect and enhanced PCE in KSCN-PSCs. This work gives a low-cost and practical strategy to develop a high-quality PEDOT:PSS HTLs from diluted PEDOT:PSS aqueous solution for efficient TPSCs.
- potassium thiocyanate;
- diluted PEDOT:PSS solution;
- tin-based perovskite solar cells;
- photovoltaic performance

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