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Research Article

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

Razi Ahmad1,5, Gautam Virender Nutan1, Dinesh Singh2, Govind Gupta1, Udit Soni3, Sameer Sapra4, Ritu Srivastava1( )
Advanced Materials and Devices Metrology Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-110012, India
Indian Reference Materials Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-110012, India
Department of Biotechnology, TERI School of Advanced studies, New Delhi 110070, India
Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
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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.

Keywords

double perovskite nanocrystalscolloidal and chemical stabilitythin filmsolar cells

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Nano Research
Volume 14 Issue 4,
April 2021
Pages 1126-1134
DOI: 10.1007/s12274-020-3161-6
Cite this article:
Ahmad R, Nutan GV, Singh D, et al. Colloidal lead-free Cs2AgBiBr6 double perovskite nanocrystals: Synthesis, uniform thin-film fabrication, and application in solution-processed solar cells. Nano Research, 2021, 14(4): 1126-1134. https://doi.org/10.1007/s12274-020-3161-6
Topics:
Bismuth compoundsBromine compoundsCoordination reactionsFabricationNanocrystalsOptoelectronic devicesPerovskitePerovskite solar cellsSolsThin film solar cellsThin films

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Received: 24 February 2020
Revised: 03 October 2020
Accepted: 08 October 2020
Published: 19 November 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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