# Defect-Induced Bandgap Widening and Abnormal Photoluminescence in Formamidinium Tin Iodide Perovskite Microcrystals

https://mdr.nims.go.jp/datasets/074003b0-e286-4f37-b4a1-097bc3733f80

## File

- [Manuscript.docx](https://mdr.nims.go.jp/filesets/4b633a6b-322a-4435-86ac-7c6141c1c529/download) ([Detail](https://mdr.nims.go.jp/filesets/4b633a6b-322a-4435-86ac-7c6141c1c529.md))

## Id

074003b0-e286-4f37-b4a1-097bc3733f80

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-08-05T13:28:50.356315Z

## Updated at

2025-06-23T23:30:26.795535Z

## Published at

2025-06-23T23:20:45.024418Z

## Doi

https://doi.org/10.48505/nims.4629

## First published url

https://doi.org/10.1021/acsmaterialslett.4c00860

## Date published

2024-08-05

## Recorded date published

2024-8-5

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Defect-Induced Bandgap Widening and Abnormal Photoluminescence in Formamidinium
    Tin Iodide Perovskite Microcrystals
  title_type: original
  lang: en

## Description

- description: Formamidinium tin iodide (FASnI3) has emerged as a promising semiconductor
    material for various optoelectronic applications. However, the structure−photophysical
    property relationship remains ambiguous, because of the ready occurrence of structural
    defects in the fragile lattice. Here, using FASnI3 microcrystals synthesized with
    tailored reaction conditions, we unveil that structural defects can induce bandgap
    widening and abnormal photoluminescence. Based on combined analysis of X-ray photoelectron
    spectroscopy, solidstate nuclear magnetic resonance, and optical spectroscopy,
    we propose that bandgap widening could stem from defect mediated lattice distortion.
    Temperature-dependent photoluminescence measurements lead us to the discovery
    of a new near-infrared photoluminescence band between 185 and 10 K and negative
    thermal quenching in a broad range of 110−200 K. We believe that the knowledge
    gained here may not only offer a plausible roadmap to prepare high-quality organic−inorganic
    tin halide perovskite crystals but can also deepen our understanding on the relationship
    between defects and photophysical properties of tin-based perovskites.
  description_type: abstract
  lang: und

## Creator

- name: Jia-Kai Chen
  role: author
  orcid: https://orcid.org/0000-0002-4348-3132
- name: Bin-Bin Zhang
  role: author
  orcid: https://orcid.org/0000-0002-9711-6741
- name: Naoto Shirahata
  role: author
  orcid: https://orcid.org/0000-0002-1217-7589
- name: Hong-Tao Sun
  role: author
  orcid: https://orcid.org/0000-0002-0003-7941

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: halide perovskite
  schema: not_defined

## Rights

- description: This document is the Accepted Manuscript version of a Published Work
    that appeared in final form in ACS Materials Letters, copyright © 2024 American
    Chemical Society after peer review and technical editing by the publisher. To
    access the final edited and published work see https://doi.org/10.1021/acsmaterialslett.4c00860
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-06-24
end_date: 2025-06-24

## Journal

- title: ACS Materials Letters
  issn: '26394979'
  volume: '6'
  issue: '8'
  start_page: 3218
  end_page: 3225

## Conference



## Related item



## Funding

- identifier: 21H01743
  funder_name: Japan Society for the Promotion of Science
- identifier: 24K01278
  funder_name: Japan Society for the Promotion of Science
- identifier: 24K01462
  funder_name: Japan Society for the Promotion of Science

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## Chemical composition



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## Fileset

- id: 4b633a6b-322a-4435-86ac-7c6141c1c529
  filename: Manuscript.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 28368402
  md5: 9e244fa2408a4155cf4f79a37d2b0a59

## Thumbnail

fileset_id: 4b633a6b-322a-4435-86ac-7c6141c1c529
filename: Manuscript.docx