Mitigating tin ion migration and reinforcing buried interface via synergistic polymer-modified tin oxide
Abstract The buried interface between the charge transport layer and the overlying perovskite absorber is critical yet difficult to probe in perovskite solar cells. Because light enters through the transparent substrate and is predominantly absorbed near this region, photo-induced degradation processes are partially initiated at the hidden buried interface. Here, we reveal that instability at the buried SnO 2 /perovskite interface triggers structural and chemical decomposition of the perovskite layer. To address this issue, we introduce polymeric interlayers that simultaneously reinforce interfacial bonding and suppress tin-ion migration. Poly(1-ethenylpyrrolidine-2,5-dione) (PED) forms a robust and chemically compatible interface, yielding enhanced phase purity, reduced defect density, and significantly mitigated tin diffusion. These findings identify the buried SnO 2 /perovskite interface as a key degradation-sensitive region under light aging and highlight interfacial polymer design as an effective strategy for improving the intrinsic stability of perovskite photovoltaics.
Authors
- Minhuan Wang (ORCID: https://orcid.org/0000-0001-6600-8791)
- Yingke Zhu (ORCID: https://orcid.org/0000-0002-7131-1960)
- Yuran Shi (ORCID: https://orcid.org/0000-0003-1136-3694)
- Xiaoqing Pan (ORCID: https://orcid.org/0000-0002-0965-8568)
- Yu‐Che Lin (ORCID: https://orcid.org/0000-0002-4093-9122)
- Joo‐Hong Lee (ORCID: https://orcid.org/0000-0002-7458-9706)
- Chia‐Yu Lin (ORCID: https://orcid.org/0000-0001-9591-9260)
- Tso-An Yang (ORCID: https://orcid.org/0000-0001-8645-6946)
- Jing Cao (ORCID: https://orcid.org/0000-0003-3978-911X)
- İlhan Yavuz (ORCID: https://orcid.org/0000-0002-3268-6268)
- Anatoly I. Frenkel (ORCID: https://orcid.org/0000-0002-5451-1207)
- Wenxin Yang (ORCID: https://orcid.org/0000-0002-0901-9299)
- Yepin Zhao (ORCID: https://orcid.org/0000-0001-9988-0949)
- Zhichao Shen (ORCID: https://orcid.org/0000-0003-0458-5264)
- Dong Meng (ORCID: https://orcid.org/0000-0001-6776-0707)
- Ming Gong (ORCID: https://orcid.org/0000-0002-1584-1211)
- Jinsung Kim (ORCID: https://orcid.org/0000-0001-5667-9970)
- Aman Dhillon
- Yang Yang (ORCID: https://orcid.org/0000-0001-8833-7641)
- Jin‐Wook Lee (ORCID: https://orcid.org/0000-0002-0170-8620)
- Yiushun Tong
- Ran Zheng (ORCID: https://orcid.org/0000-0001-7786-5094)
- Mingjie Xu (ORCID: https://orcid.org/0000-0001-8334-6936)
- Haoxiang Duan
- Enxi Zhang
- Weixuan Huang
- Zhen-Yang Suo (ORCID: https://orcid.org/0009-0009-5297-7095)
- Jian-Guo Zheng
- Ying Zhang
Institutions
- Seoul National University (KR)
- University of California, Los Angeles (US)
- Yonsei University (KR)
- University of California, Irvine (US)
- Lanzhou University of Technology (CN)
- Ministry of Education (ET)
- Stony Brook University (US)
- Marmara University (TR)
- Lanzhou University (CN)
- Stanford University (US)
Publication Details
- Journal
- Nature Communications
- Published
- 2026-09-11
- DOI
- https://doi.org/10.1038/s41467-026-77624-8
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00