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VOC over 1.2 V for Cs2AgBiBr6 solar cells based on formamidinium acetate additive

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Abstract

Cs2AgBiBr6 is a lead-free perovskite that shows great potential to solve the toxicity and instability of organic–inorganic lead perovskite. However, because of the poor interface contact and inferior film quality, the open-circuit voltage and the power conversion efficiency of the solar cells are inhibited. Herein, the Cs2AgBiBr6 film quality is improved by adding formamidinium acetate into the precursor solution. With additive regulation, the grain size increases and the film surface is more smooth. The crystal structure remains unchanged, and the defect density decreases. Correspondingly, the average power conversion efficiency of the target device increases more than 30% than the control device. The best efficiency approaches 2.09%, and the open-circuit voltage is surprisingly high at 1.23 V, the highest value reported for Cs2AgBiBr6 solar cells. Moreover, the device remains more than 90% of its initial efficiency after 40 days of storage under environmental conditions, showing excellent stability. This work is therefore helpful for enhancing the efficiency and stability of inorganic lead-free perovskite solar cells toward future commercialization.

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Acknowledgements

The acknowledgements come at the end of an article after the conclusions and before the notes and references. This work was supported by the National Key Research and Development Program of China (2019YFE0101300) and the Hefei Municipal Natural Science Foundation (2021040).

Funding

This work was supported by National Key Research and Development Program of China (Grant No. 2019YFE0101300), Hefei Municipal Natural Science Foundation (Grant No. 2021040).

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Authors and Affiliations

  1. Special Display and Imaging Technology Innovation Center of Anhui Province, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Academy of Opto-Electric Technology, Hefei University of Technology, 193 Tunxi Road, Hefei, 230009, People’s Republic of China

    Akang Yang, Lun Zhang, Yinyan Xu, Qian Wang, Mei Lyu, Hongbo Lu & Jun Zhu

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  1. Akang Yang
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  2. Lun Zhang
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Contributions

Research idea: JZ, ML; Methodology and writing-original draft preparation: AY; Data curation: AY, LZ; Validation: LZ, QW; Conceptualization and investigation: YX; Formal analysis: ML, HL; Resources: QW, HL; Writing-review and editing: JZ; Supervision: ML, JZ.

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Correspondence to Jun Zhu.

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10854_2022_8724_MOESM1_ESM.pdf

Supplementary file1 (PDF 587 KB)—PL and TRPL spectra; J–V curves of forward scan and reverse scan; Statistic photovoltaic parameters; Fitted lifetime parameters; Photovoltaic parameters and hyssteresis index.

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Yang, A., Zhang, L., Xu, Y. et al. VOC over 1.2 V for Cs2AgBiBr6 solar cells based on formamidinium acetate additive. J Mater Sci: Mater Electron 33, 18758–18767 (2022). https://doi.org/10.1007/s10854-022-08724-6

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