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説明:

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.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Perovskite Solar Cells, Sn–Pb, Defect Passivation

刊行年月日: 2026-03-18

出版者: Wiley

掲載誌:

• Small (ISSN: 16136810) vol. 22 issue. 27 e00050

研究助成金:

• JST-Mirai Program JPMJMI21E6

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2026-10-07 09:01:39 +0900

MDRでの公開時刻: 2026-10-07 10:24:21 +0900