Polymer hole-transport material improving thermal stability of inorganic perovskite solar cells
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RESEARCH ARTICLE
Polymer hole-transport material improving thermal stability of inorganic perovskite solar cells Shaiqiang MU1,2, Qiufeng YE2,3, Xingwang ZHANG2,3, Shihua HUANG (✉)1, Jingbi YOU (✉)2,3 1 Physics Department, Zhejiang Normal University, Jinhua 321004, China 2 Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China 3 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
© Higher Education Press 2020
Abstract Cesium-based inorganic perovskite solar cells (PSCs) are paid more attention because of their potential thermal stability. However, prevalent salt-doped 2,2′,7,7′tetrakis(N,N-dipmethoxyphenylamine)9,9′-spirobifluorene (Spiro-OMeTAD) as hole-transport materials (HTMs) for a high-efficiency inorganic device has an unfortunate defective thermal stability. In this study, we apply poly (3-hexylthiophene-2,5-diyl) (P3HT) as the HTM and design all-inorganic PSCs with an indium tin oxide (ITO)/SnO2/LiF/CsPbI3 – xBrx/P3HT/Au structure. As a result, the CsPbI3 – xBrx PSCs achieve an excellent performance of 15.84%. The P3HT HTM-based device exhibits good photo-stability, maintaining ~80% of their initial power conversion efficiency over 280 h under one Sun irradiation. In addition, they also show better thermal stability compared with the traditional HTM SpiroOMeTAD. Keywords inorganic perovskite solar cell (PSC), holetransport material (HTM), stability
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Introduction
In the past 10 years, the power conversion efficiency (PCE) of organic–inorganic hybrid perovskite solar cells (PSCs) has skyrocketed from 3.8% to 25.2% [1,2] because of their excellent optoelectronic properties, including high absorption coefficient [3,4], high carrier mobility [5], long balanced carrier diffusion length [6], and low exciton binding energy [7]. However, organic–inorganic hybrid PSCs face poor thermal stability caused by the organic compound [8]. The severe stability issue of PSCs could be effectively released when an inorganic cation, such as Cs+, Received April 22, 2020; accepted May 9, 2020 E-mails: [email protected], [email protected]
partially or fully substitutes the organic cations [9,10]. For the stability issue of the all-inorganic PSCs, apart from the intrinsic phase stability, the selection of holetransport material (HTM) has also shown a significant effect [11]. The most commonly employed HTMs in inorganic PSCs are still 2,2′,7,7′-tetrakis(N,N-dipmethoxyphenylamine)9,9′-spirobifluorene (Spiro-OMeTAD) and poly[bis(4-phenyl) (2,4,6-trimethylphenyl)amine] (PTAA) [12–21]. You and colleagues simultaneously prepared a CsPbI3 device with the indium tin oxide (ITO)/SnO2/ CsPbI3/Spiro-OMeTAD/Au structure in a completely dry nitrogen environment and obtained 15.7% PCE [12]. Zhao et al. fabricated a perovskite device with the ITO/c-TiO2/ CsPbI3/Spiro-OMeTAD/Ag structure and gained an excellent performance of 19.09% [13]. Meanwhile, Liu et al. applied PTAA as the HTM for the CsPbI3 d
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