# Chelating Coordination Regulates Perovskite Crystallization and Defect Passivation in Sn–Pb Perovskite Solar Cells

https://mdr.nims.go.jp/datasets/55e37853-e3af-43d5-be1a-9f4a0b771d33

## File

- [Small - 2026 - Karim - Chelating Coordination Regulates Perovskite Crystallization and Defect Passivation in Sn Pb.pdf](https://mdr.nims.go.jp/filesets/e36737fa-bdf2-4023-8962-dbd49b8721c4/download) ([Detail](https://mdr.nims.go.jp/filesets/e36737fa-bdf2-4023-8962-dbd49b8721c4.md))

## Id

55e37853-e3af-43d5-be1a-9f4a0b771d33

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-10-06T06:41:36.736047Z

## Updated at

2026-10-07T00:01:39.183882Z

## Published at

2026-10-07T01:24:21.356200Z

## Doi



## First published url

https://doi.org/10.1002/smll.202600050

## Date published

2026-03-18

## Recorded date published

2026-5

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Chelating Coordination Regulates Perovskite Crystallization and Defect Passivation
    in Sn–Pb Perovskite Solar Cells
  title_type: original
  lang: en

## Description

- description: "Tin-lead (Sn-Pb) perovskite (TLP) serve as potential narrow-bandgap
    absorbers for photovoltaics; unfortunately, issues such as uncontrolled crystallization,
    Sn2+ oxidation, and interfacial defects continue to limit device efficiency and
    stability. In this study, we present a chelating coordination strategy at buried
    and top perovskite interface utilizing ethylenediamine diacetate (EDDA) to synergistically
    regulate perovskite crystallization and defect passivation in TLP. Post-treatment
    of PEDOT:PSS using EDDA mitigates surface acidity and reduces insulating PSS-rich
    domains through ionic exchange, thereby shifting the buried interface potential.
    The carboxylate (─COO−) groups of EDDA coordinate with undercoordinated Pb2+/Sn2+
    cations, while the ─NH3+ groups form hydrogen bonds in TLP. These interactions
    at buried interface reduce nucleation concentration and promote homogeneous and
    orderly (100)-facet crystal growth across TLP films. The chemical polishing of
    the TLP top surface inhibits the Sn2+ oxidation, reduces defects and facilitates
    more efficient charge extraction. As a result, the Target devices demonstrate
    a power conversion efficiency (PCE) of 23.30% (0.09 cm2), with an enhanced open-circuit
    voltage of 0.877 V and a fill factor of 81.81%. Importantly, the Target device
    shows high stability for 300 s under continuous sunlight at maximum power point
    tracking and maintains 90% efficiency after 1800 h of storage in N2.\r\n"
  description_type: abstract
  lang: und

## Creator

- name: Md. Abdul Karim
  role: author
- name: Shamim Ahmmed
  role: author
- name: Siliang Cao
  role: author
- name: Md. Emrul Kayesh
  role: author
- name: Yulu He
  role: author
- name: Md. Ataur Rahman
  role: author
- name: Wasif Islam Chowdhury
  role: author
- name: Masatoshi Yanagida
  role: author
  orcid: https://orcid.org/0000-0002-8065-7875
  organization: National Institute for Materials Science
- name: Yasuhiro Shirai
  role: author
  orcid: https://orcid.org/0000-0003-2164-5468
  organization: National Institute for Materials Science
- name: Ashraful Islam
  role: author
  orcid: https://orcid.org/0000-0002-1633-1432
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: Perovskite Solar Cells
  schema: not_defined
- subject: Sn–Pb
  schema: not_defined
- subject: Defect Passivation
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/
  date_licensed: 2026-03-18

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Small
  issn: '16136810'
  volume: '22'
  issue: '27'
  article_number: e00050

## Conference



## Related item



## Funding

- identifier: JPMJMI21E6
  funder_name: JST-Mirai Program

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: e36737fa-bdf2-4023-8962-dbd49b8721c4
  filename: Small - 2026 - Karim - Chelating Coordination Regulates Perovskite Crystallization
    and Defect Passivation in Sn Pb.pdf
  content_type: application/pdf
  size: 12614631
  md5: 369a0208765c7a2fd00827ac421bac28

## Thumbnail

fileset_id: e36737fa-bdf2-4023-8962-dbd49b8721c4
filename: Small - 2026 - Karim - Chelating Coordination Regulates Perovskite Crystallization
  and Defect Passivation in Sn Pb.pdf