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Colloidal lead-free Cs2AgBiBr6 double perovskite nanocrystals: Synthesis, uniform thin-film fabrication, and application in solution-processed solar cells

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Abstract

Recently developed lead-free double perovskite nanocrystals (NCs) have been proposed for the possible application in solution-processed optoelectronic devices. However, the optoelectronic applications of double perovskite NCs have been hampered due to the structural and chemical instability in the presence of polar molecules. Here, we report a facile strategy for the synthesis and purification of Cs2AgBiBr6 double perovskite NCs that remained stable even after washing with polar solvent. This is realized with our efficient colloidal route to synthesize Cs2AgBiBr6 NCs that involve stable and strongly coordinated precursor such as silver-trioctylphosphine complex together with bismuth neodecanoate, which leads to a significantly improved chemical and colloidal stability. Using layer-by-layer solid-state ligand exchange technique, a compact and crack-free thin film of Cs2AgBiBr6 NCs were fabricated. Finally, perovskite solar cells consisting of Cs2AgBiBr6 as an absorber layer were fabricated and tested.

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Acknowledgements

The authors are grateful to the Director of the NPL, New Delhi, India for the facility. R. A. gratefully acknowledge the financial support from the Council of Scientific and Industrial Research (CSIR), New Delhi, for the award of RA.

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Authors and Affiliations

  1. Advanced Materials and Devices Metrology Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India

    Razi Ahmad, Gautam Virender Nutan, Govind Gupta & Ritu Srivastava

  2. Indian Reference Materials Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India

    Dinesh Singh

  3. Department of Biotechnology, TERI School of Advanced studies, New Delhi, 110070, India

    Udit Soni

  4. Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, 110016, India

    Sameer Sapra

  5. Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71, Olomouc, Czech Republic

    Razi Ahmad

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  1. Razi Ahmad
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Colloidal lead-free Cs2AgBiBr6 double perovskite nanocrystals: Synthesis, uniform thin-film fabrication, and application in solution-processed solar cells

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Ahmad, R., Nutan, G.V., Singh, D. et al. Colloidal lead-free Cs2AgBiBr6 double perovskite nanocrystals: Synthesis, uniform thin-film fabrication, and application in solution-processed solar cells. Nano Res. 14, 1126–1134 (2021). https://doi.org/10.1007/s12274-020-3161-6

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