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Research Article

Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer

Yongbin Jin§, Huiping Feng§, Zheng Fang, Liu Yang, Kaikai Liu, Bingru Deng, Jingfu Chen, Xueling Chen, Yawen Zhong, Jinxin Yang, Chengbo Tian, Liqiang Xie( ), Zhanhua Wei( )
Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China

§ Yongbin Jin and Huiping Feng contributed equally to this work.

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Graphical Abstract

A polymer composite hole transport layer containing the π-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c: 4',5'-c']dithiophene-4,8-dione)] (PBDB-T) and 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (Spiro-OMeTAD) is used to stabilize semi-transparent perovskite solar cells (ST-PSCs), contributing to 13.71%-efficiency ST-PSCs with improved thermal and operational stability.

Abstract

Semi-transparent perovskite solar cells (ST-PSCs) have broad applications in building integrated photovoltaics. However, the stability of ST-PSCs needs to be improved, especially in n-i-p ST-PSCs since the doped 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (Spiro-OMeTAD) is unstable at elevated temperatures and high humidity. In this work, a π-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)] (PBDB-T) is selected to form a polymer composite hole transport layer (HTL) with Spiro-OMeTAD. The sulfur atom of the thiophene unit and the carbonyl group of the polymer interact with the undercoordinated Pb2+ at the perovskite surface, which stabilizes the perovskite/HTL interface and passivates the interfacial defects. The incorporation of the polymer also increases the glass transition temperature and the moisture resistance of Spiro-OMeTAD. As a result, we obtain ST-PSCs with a champion efficiency of 13.71% and an average visible light transmittance of 36.04%. Therefore, a high light utilization efficiency of 4.94% can be obtained. Moreover, the encapsulated device can maintain 84% of the initial efficiency after 751 h under continuous one-sun illumination (at 30% relative humidity) at the open circuit and the unencapsulated device can maintain 80% of the initial efficiency after maximum power tracking for more than 1250 h under continuous one-sun illumination.

Keywords

semi-transparent solar cellsπ-conjugated polymercomposite hole transport layerbuilding integrated photovoltaics

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Nano Research
Volume 17 Issue 3,
March 2024
Pages 1500-1507
DOI: 10.1007/s12274-023-5975-5
Cite this article:
Jin Y, Feng H, Fang Z, et al. Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer. Nano Research, 2024, 17(3): 1500-1507. https://doi.org/10.1007/s12274-023-5975-5
Topics:
Perovskite solar cells

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Received: 18 May 2023
Revised: 28 June 2023
Accepted: 30 June 2023
Published: 22 August 2023
© Tsinghua University Press 2023
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