Solution Processable Direct Bandgap Copper‐Silver‐Bismuth Iodide Photovoltaics: Compositional Control of Dimensionality and Optoelectronic Properties

Autor: Narendra Pai, Manjunath Chatti, Sebastian O. Fürer, Andrew D. Scully, Sonia R. Raga, Nitish Rai, Boer Tan, Anthony S. R. Chesman, Zhou Xu, Kevin J. Rietwyk, Saripally Sudhaker Reddy, Yvonne Hora, Gaveshana A. Sepalage, Nadja Glück, Monica Lira‐Cantú, Udo Bach, Alexandr N. Simonov
Přispěvatelé: Australian Centre for Advanced Photovoltaics, Australian Renewable Energy Agency, Australian Research Council, La Caixa
Rok vydání: 2022
Předmět:
Zdroj: Dipòsit Digital de Documents de la UAB
Universitat Autònoma de Barcelona
ISSN: 1614-6840
1614-6832
Popis: The search for lead-free alternatives to lead-halide perovskite photovoltaic materials resulted in the discovery of copper(I)-silver(I)-bismuth(III) halides exhibiting promising properties for optoelectronic applications. The present work demonstrates a solution-based synthesis of uniform CuAgBiI thin films and scrutinizes the effects of x on the phase composition, dimensionality, optoelectronic properties, and photovoltaic performance. Formation of pure 3D CuAgBiI at x = 1, 2D CuAgBiI at x = 2, and a mix of the two at 1 < x < 2 is demonstrated. Despite lower structural dimensionality, CuAgBiI has broader optical absorption with a direct bandgap of 1.89 ± 0.05 eV, a valence band level at -5.25 eV, improved carrier lifetime, and higher recombination resistance as compared to CuAgBiI. These differences are mirrored in the power conversion efficiencies of the CuAgBiI and CuAgBiI solar cells under 1 sun of 1.01 ± 0.06% and 2.39 ± 0.05%, respectively. The latter value is the highest reported for this class of materials owing to the favorable film morphology provided by the hot-casting method. Future performance improvements might emerge from the optimization of the CuAgBiI layer thickness to match the carrier diffusion length of ≈40–50 nm. Nonencapsulated CuAgBiI solar cells display storage stability over 240 days.
The authors acknowledge funding of this work by the Australian Government through the Australian Centre for Advanced Photovoltaics (ACAP), the Australian Renewable Energy Agency (ARENA), and the Australian Research Council through the Centre of Excellence in Exciton Science (CE170100026) and Future Fellowship to ANS (FT200100317). SRR acknowledges the support from “laCaixa” Foundation (ID 100010434; LCF/BQ/PI20/11760024).
Databáze: OpenAIRE
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