Steric‐Complementary Synergistic Strategy for High‐Efficiency Monolithic Perovskite/Silicon Tandem Solar Cells

Abstract Achieving efficiencies beyond 40% with perovskite/silicon tandems hinges on conquering the challenge of interfacial recombination without inducing deleterious trade‐offs in charge extraction or stability. Herein, a steric‐complementary synergistic strategy (SCSS) is introduced that resolves this dilemma using a molecular dyad of piperazine (Pip + ) and phenethyl ammonium (PEA + ) cations. It is demonstrated that the compact Pip + cation infiltrates and neutralizes deep‐level surface defects inaccessible to larger molecules, while its bulkier PEA + counterpart co‐assembles into a robust, hydrophobic canopy that shields the interface from environmental stressors. This cooperative architecture synergistically suppresses trap‐state density and mitigates resistive losses, simultaneously enhancing charge extraction and device stability. Consequently, the tandem devices achieve a certified power conversion efficiency (PCE) of 32.12%. These tandems also exhibit exceptional operational stability, retaining over 80% of their initial efficiency after 1000 h of continuous one sun illumination under maximum power point tracking. This work establishes that engineering interfaces with sterically mismatched, functionally complementary molecules is a potent strategy, providing a clear pathway toward next‐generation tandem photovoltaics that are both highly efficient and truly durable.

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Publication Details

Journal
Advanced Functional Materials
Published
2025-11-13
DOI
https://doi.org/10.1002/adfm.202521431
Citations
2
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
1.46

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article

Steric‐Complementary Synergistic Strategy for High‐Efficiency Monolithic Perovskite/Silicon Tandem Solar Cells

Bowen Yang, Huifeng Meng, Pengxu Chen, Guangshan Zhu et al.
2 citations
Advanced Functional Materials
Perovskite Materials and Applications
1.46
article

Steric‐Complementary Synergistic Strategy for High‐Efficiency Monolithic Perovskite/Silicon Tandem Solar Cells

Bowen Yang, Huifeng Meng, Pengxu Chen, Guangshan Zhu, Fengxian Cao, Weichun Pan, Wenhao Li, Yang Liu, Weihai Sun, Xinbo Yang, Cao Yu, Wei Shi, Zhongliang Yan, Jihuai Wu, Chang Wang, Bo Gao, Kun Gao, Shibo Wang, Jun Yin, Xueying Yang, Weipeng Jiang, Yufeng Zhu, Guifang Xu, Shaofei Yang, Haocheng Wang
article en
2 citations

Abstract

Abstract Achieving efficiencies beyond 40% with perovskite/silicon tandems hinges on conquering the challenge of interfacial recombination without inducing deleterious trade‐offs in charge extraction or stability. Herein, a steric‐complementary synergistic strategy (SCSS) is introduced that resolves this dilemma using a molecular dyad of piperazine (Pip + ) and phenethyl ammonium (PEA + ) cations. It is demonstrated that the compact Pip + cation infiltrates and neutralizes deep‐level surface defects inaccessible to larger molecules, while its bulkier PEA + counterpart co‐assembles into a robust, hydrophobic canopy that shields the interface from environmental stressors. This cooperative architecture synergistically suppresses trap‐state density and mitigates resistive losses, simultaneously enhancing charge extraction and device stability. Consequently, the tandem devices achieve a certified power conversion efficiency (PCE) of 32.12%. These tandems also exhibit exceptional operational stability, retaining over 80% of their initial efficiency after 1000 h of continuous one sun illumination under maximum power point tracking. This work establishes that engineering interfaces with sterically mismatched, functionally complementary molecules is a potent strategy, providing a clear pathway toward next‐generation tandem photovoltaics that are both highly efficient and truly durable.

Advanced Functional MaterialsVol. 36(25)
Jiangsu University (CN), Huaqiao University (CN), Hong Kong Polytechnic University (HK), Maxwell Technologies (United States) (US), Soochow University (CN), Shenzhen Institutes of Advanced Technology (CN), Shanghai Institute of Microsystem and Information Technology (CN), ARTS Group (China) (CN)
National Natural Science Foundation of China, China Postdoctoral Science Foundation, Government of Jiangsu Province, Hong Kong Polytechnic University
Openalex Percentile: Top 14%
Perovskite Materials and Applications
1.46
DOIOpen Access PDFOpenAlex
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