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Influence of an SCN- moiety on the electronic properties of γ-CsPb(SCN)xBr3-x and the performance of carbon-based HTL-free γ-CsPb(SCN)xBr3-x perovskite solar cells

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Abstract

A CsPbBr3 film was prepared by the hot-casting method from a mixed CsBr and PbBr2 solution with an orthorhombic-phase (γ) CsPbBr3 perovskite structure. γ-CsPbBr3 film has a yellow color with a bandgap energy of 2.32 eV. The low SCN- dopant level forming CsPb(SCN)xBr3-x (x = 0.0625, 0.125, 0.01875, 0.25 and 0.5) films maintains an orthorhombic CsPb(SCN)xBr3-x structure with a film bandgap of 2.32-2.34 eV. The calculated bandgap of the optimized γ-CsPb(SCN)xBr3-x structures slightly changed with SCN- dopant levels from x = 0 to x = 0.5. A carbon-based hole transport layer (HTL)-free γ-CsPb(SCN)0.25Br2.75 solar cell delivers the highest efficiency of 4.5% under six conditions compared to a carbon-based HTL-free pure γ-CsPbBr3 solar cell with an efficiency of 3.89%. The stability of the carbon-based HTL-free γ-CsPb(SCN)0.25Br2.75 solar cell is better than that of the carbon-based HTL-free pure γ-CsPbBr3 solar cell with efficiency retention of 88.96% and 61.86% of their initial values, respectively, after a 30-day testing period.

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Acknowledgements

The authors would like to give special thanks to Miss Pantiwa Kumlangwan and Miss Madsakorn Towannang for their suggestions and help in the experimental work. This work was supported by the Research Network NANOTEC (RNN) program of the National Nanotechnology Center (NANOTEC), NSTDA, Ministry of Higher Education, Science, Research and Innovation and Khon Kaen University, Thailand, by the Center of Excellence in Physics (ThEP), by the Integrated Nanotechnology Center, Khon Kaen University, by Srinakharinwirot University (Contract number 028/2564), and by the National Nanotechnology Center (NANOTEC), NSTD, Ministry of Science and Technology, Thailand, through its program of Center of Excellence Network.

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Authors and Affiliations

  1. Faculty of Science, Department of Physics, Khon Kaen University, Khon Kaen, 40002, Thailand

    Pitphichaya Suksaengrat, Viyada Harnchana,  Wirat Jarernboon, Pornjuk Srepusharawoot & Vittaya Amornkitbamrung

  2. Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology, Thanyaburi, Pathum Thani, 12110, Thailand

    Narit Faibut

  3. Faculty of Science, Department of Chemistry, Ramkhamhaeng University, Bangkapi, Bangkok, 10240, Thailand

    Apiwat Chompoosor

  4. Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University, Khon Kaen, 40002, Thailand

    Viyada Harnchana,  Wirat Jarernboon, Pornjuk Srepusharawoot & Vittaya Amornkitbamrung

  5. Thailand Center of Excellence in Physics (ThEP), Chiang Mai University, P.O. Box 70, Chiang Mai, 50202, Thailand

    Viyada Harnchana,  Wirat Jarernboon, Pornjuk Srepusharawoot, Samuk Pimanpang & Vittaya Amornkitbamrung

  6. National Nanotechnology Center (NANOTEC), National Science and Technology (NSTDA), Khlong Luang, Pathumthani, 12120, Thailand

    Pisist Kumnorkaew

  7. Faculty of Science, Department of Physics, Srinakharinwirot University, Bangkok, 10110, Thailand

    Samuk Pimanpang

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  1. Pitphichaya Suksaengrat
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Suksaengrat, P., Faibut, N., Chompoosor, A. et al. Influence of an SCN- moiety on the electronic properties of γ-CsPb(SCN)xBr3-x and the performance of carbon-based HTL-free γ-CsPb(SCN)xBr3-x perovskite solar cells. J Mater Sci: Mater Electron 32, 1557–1569 (2021). https://doi.org/10.1007/s10854-020-04924-0

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