Interfacial alloying between lead halide perovskite crystals and hybrid glasses

Xuemei Li, Wengang Huang, Andraž Krajnc, Yuwei Yang, Atul Shukla, Jaeho Lee, Mehri Ghasemi, Isaac Martens, Bun Chan, Dominique Appadoo, Peng Chen, Xiaoming Wen, Julian A. Steele, Haira G. Hackbarth, Qiang Sun, Gregor Mali, Rijia Lin, Nicholas M. Bedford, Vicki Chen, Anthony K. Cheetham, Luiz H. G. Tizei, Sean M. Collins, Lianzhou Wang and Jingwei Hou ()
Additional contact information
Xuemei Li: The University of Queensland
Wengang Huang: The University of Queensland
Andraž Krajnc: National Institute of Chemistry
Yuwei Yang: The University of New South Wales
Atul Shukla: The University of Queensland
Jaeho Lee: The University of Queensland
Mehri Ghasemi: RMIT University
Isaac Martens: European Synchrotron Radiation Facility
Bun Chan: Nagasaki University
Dominique Appadoo: Australian Synchrotron
Peng Chen: The University of Queensland
Xiaoming Wen: RMIT University
Julian A. Steele: The University of Queensland
Haira G. Hackbarth: The University of New South Wales
Qiang Sun: Sichuan University
Gregor Mali: National Institute of Chemistry
Rijia Lin: The University of Queensland
Nicholas M. Bedford: The University of New South Wales
Vicki Chen: The University of Queensland
Anthony K. Cheetham: University of California
Luiz H. G. Tizei: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Sean M. Collins: University of Leeds
Lianzhou Wang: The University of Queensland
Jingwei Hou: The University of Queensland

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The stellar optoelectronic properties of metal halide perovskites provide enormous promise for next-generation optical devices with excellent conversion efficiencies and lower manufacturing costs. However, there is a long-standing ambiguity as to whether the perovskite surface/interface (e.g. structure, charge transfer or source of off-target recombination) or bulk properties are the more determining factor in device performance. Here we fabricate an array of CsPbI3 crystal and hybrid glass composites by sintering and globally visualise the property-performance landscape. Our findings reveal that the interface is the primary determinant of the crystal phases, optoelectronic quality, and stability of CsPbI3. In particular, the presence of a diffusion “alloying” layer is discovered to be critical for passivating surface traps, and beneficially altering the energy landscape of crystal phases. However, high-temperature sintering results in the promotion of a non-stoichiometric perovskite and excess traps at the interface, despite the short-range structure of halide is retained within the alloying layer. By shedding light on functional hetero-interfaces, our research offers the key factors for engineering high-performance perovskite devices.

Date: 2023
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DOI: 10.1038/s41467-023-43247-6

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