Buried SnI<sub>2</sub> Induces Gradient Heterojunctions in Sn–Pb Perovskite Solar Cells

Tin–lead (Sn–Pb) mixed perovskite solar cells (PSCs) offer the potential for higher power conversion efficiency (PCE) than their pure lead counterparts. However, the lack of a well-defined Sn/Pb compositional profile results in disordered internal electric fields, limiting carrier separation. Here, we introduce a SnI2 predeposition strategy that induces a vertical Sn/Pb composition gradient within the perovskite film. This gradient forms a continuous heterojunction, establishing a built-in electric field that enhances carrier separation and directional extraction. As a result, the optimized devices achieve a PCE of 23.2% along with improved stability, retaining 89.6% of their initial efficiency after 1032 h of storage in nitrogen. This work demonstrates a compositional and interfacial engineering approach for advancing the efficiency and durability of Sn–Pb mixed PSCs.

Authors

Institutions

Publication Details

Journal
ACS Energy Letters
Published
2025-04-03
DOI
https://doi.org/10.1021/acsenergylett.5c00305
Citations
9
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
6.57

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Buried SnI2 Induces Gradient Heterojunctions in Sn–Pb Perovskite Solar Cells

X. Guan, Jianxi Yao, Baoping Ji, Jia Xu et al.
9 citations
ACS Energy Letters
Perovskite Materials and Applications
6.57
article

Buried SnI2 Induces Gradient Heterojunctions in Sn–Pb Perovskite Solar Cells

X. Guan, Jianxi Yao, Baoping Ji, Jia Xu, Xu Pan, Fan Shen, Xue‐Wei Liu, Yijun Wang, Chenxu Zhao, Pengchen Zou
article en
9 citations

Abstract

Tin–lead (Sn–Pb) mixed perovskite solar cells (PSCs) offer the potential for higher power conversion efficiency (PCE) than their pure lead counterparts. However, the lack of a well-defined Sn/Pb compositional profile results in disordered internal electric fields, limiting carrier separation. Here, we introduce a SnI2 predeposition strategy that induces a vertical Sn/Pb composition gradient within the perovskite film. This gradient forms a continuous heterojunction, establishing a built-in electric field that enhances carrier separation and directional extraction. As a result, the optimized devices achieve a PCE of 23.2% along with improved stability, retaining 89.6% of their initial efficiency after 1032 h of storage in nitrogen. This work demonstrates a compositional and interfacial engineering approach for advancing the efficiency and durability of Sn–Pb mixed PSCs.

ACS Energy LettersVol. 10(5)
North China Electric Power University (CN), Chinese Academy of Sciences (CN), Hefei Institutes of Physical Science (CN), Primary Source (US), Institute of Solid State Physics (CN), State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, École Polytechnique Fédérale de Lausanne (CH)
National Natural Science Foundation of China
Openalex Percentile: Top 3%
Perovskite Materials and Applications
6.57
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.