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Tin-based perovskites, characterized by their advantageous bandgap and much lower toxicity, have emerged as a promising alternative to lead-based perovskites in solar cell applications. However, the efficiency and stability of tin-based perovskite solar cells (Sn-PSCs) are still limited by defects resulting from the easy oxidation of Sn2+ to Sn4+. Herein, an approach to enhance the optoelectronic performance of Sn-PSCs by incorporating terpyridine-zinc(II) (ZnTPY) coordination nanosheets (CONASHs), synthesized via liquid–liquid interfacial polymerization, into tin-based perovskites is delivered. Following physical fragmentation, ZnTPY CONASHs, enriched with unsaturated terpyridine groups, undergo multidentate chelation with SnI2, forming ZnTPY:SnI2 heterogeneous nuclei. This process effectively enhances the crystallization of tin-based perovskites while mitigating recombination and defect chemistry related to Sn2+ oxidation. As a result of superior crystal quality, the ZnTPY CONASHs-modified tin perovskite exhibits a longer photoluminescence lifetime. Consequently, the Sn-PSC incorporating ZnTPY complex achieves a power conversion efficiency of 11.59%, compared to 9.14% for the control device, along with improved operational stability with encapsulation. Thus, this work underscores the critical role of coordination nanosheets for regulating coordination in the precursor solution to achieve high-quality tin-based perovskite films, offering a pathway to more efficient and stable Sn-PSCs.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Tin perovskite, Coordination Nanosheets, Coordination nanosheet,, Oxidation, , Additive

刊行年月日: 2025-05-07

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Materials & Interfaces (ISSN: 19448244) vol. 17 issue. 18 p. 26813-26822

研究助成金:

• Hitachi Global Foundation 1572
• National Science and Technology Council NSTC 112-2222-E-110-004-
• National Science and Technology Council NSTC 113-2221-E-110-005-
• Taiwan Comprehensive University System
• Ministry of Education, Taiwan

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5473

公開URL: https://doi.org/10.1021/acsami.5c05011

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更新時刻: 2025-05-13 12:30:13 +0900

MDRでの公開時刻: 2025-05-13 12:23:22 +0900