Improving the performances of CsPbBr 3 solar cells fabricated in ambient condition
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Improving the performances of CsPbBr3 solar cells fabricated in ambient condition Beilei Yuan1,2, Ning Li2, Jialiang Liu2, Fan Xu3, Chen Li2, Fangying Juan3, Huanqin Yu2, Cuncheng Li1, and Bingqiang Cao2,3,* 1
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, People’s Republic of China School of Material Science and Engineering, Materials Research Center for Energy and Photoelectrochemical Conversion, University of Jinan, Jinan 250022, Shandong, People’s Republic of China 3 School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, Shandong, People’s Republic of China 2
Received: 6 July 2020
ABSTRACT
Accepted: 7 October 2020
Inorganic perovskite cesium lead bromide (CsPbBr3) gets extensive attention due to its superb stability and moisture-tolerance feature. Here, solution-processed CsPbBr3 perovskite films and their based solar cells were fabricated in ambient condition. The effect of post-annealing on the properties of the CsPbBr3 film grown and the photoelectric performance of perovskite solar cells (PSCs) have been systematically investigated, which enhances the device power conversion efficiency (PCE) from 2.67 to 5.20%. Moreover, by doping mesoporous TiO2 (m-TiO2) with reduced graphene oxide (RGO), the PCE of solar cells attained an apparent enhancement and finally improved to 7.08%. Not only high-quality CsPbBr3 perovskite films but also high-performance mesoporous PSCs were obtained by film post-annealing and electron transport layer (ETL) doping, which were all fabricated in ambient conditions.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Organic–inorganic halide perovskite is considered as a very promising alternative material for photovoltaic applications, which could compete with the silicon photovoltaics in future. In the past few years, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has rapid increase from 3.8 to 25.2% since the first report of the organic–inorganic hybrid halide PSC [1–5]. Despite the PCE has improved a lot, the
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https://doi.org/10.1007/s10854-020-04627-6
instability of PSCs which is caused by low tolerance to humidity and heat may be a critical problem for application [6–9]. At present, all-inorganic stable cesium lead halide perovskites (CsPbX3, X = I, Br, Cl) as a kind of functional materials in photovoltaics are very promising candidates, which attract more and more attention [10–15]. All-inorganic lead halide perovskites have an excellent thermal stability in ambient condition due to the higher formation energy and the absence of volatile organic component [16–18].
J Mater Sci: Mater Electron
Among these inorganic materials, the cubic CsPbI3 (a-CsPbI3) has an appropriate bandgap of 1.73 eV and can be used as a preferred active layer for photovoltaic applications [19, 20]. However, the a-CsPbI3 can only s
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