Suppressing the Interface Photodegradation towards Efficient and Stable All Perovskite Tandem Solar Cells

Zhuojia Lin; Jianwei Chen; Kezhou Fan; Jicheng Yi; Honggang Chen; Shibing Zou; Hongyu Min; Yitong Xu; Man Yu Lam; Sergeev A Aleksandr; Kam Sing Wong; He Yan; Keyou Yan

doi:10.1002/anie.202424825

Suppressing the Interface Photodegradation towards Efficient and Stable All Perovskite Tandem Solar Cells

Angew Chem Int Ed Engl. 2025 May 24:e202424825. doi: 10.1002/anie.202424825. Online ahead of print.

Authors

Zhuojia Lin^#¹, Jianwei Chen^#¹, Kezhou Fan², Jicheng Yi^{3

4}, Honggang Chen¹, Shibing Zou¹, Hongyu Min¹, Yitong Xu¹, Man Yu Lam², Sergeev A Aleksandr², Kam Sing Wong², He Yan⁴, Keyou Yan¹

Affiliations

¹ School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials. Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, 510000, P.R. China.
² Department of Physics and William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, P.R. China.
³ Guangdong-Hong Kong Joint Laboratory for Carbon Neutrality, Jiangmen Laboratory of Carbon Science and Technology, Jiangmen, Guangdong Province, 529199, P.R. China.
⁴ Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, P.R. China.

^# Contributed equally.

PMID: 40411504
DOI: 10.1002/anie.202424825

Abstract

All perovskite tandem solar cells (PTSCs) were expected to overcome the Shockley-Queisser limit of single-junction perovskite solar cells (PSCs). Nevertheless, wide bandgap (WBG) subcells suffer from large photovoltage loss and device instability due to extensive film defect, interfacial degradation and phase segregation. Herein, a polymeric multi-dentate anchoring (PMDA) strategy by introducing poly(carbazole phosphonic acid) was employed to engineer the bottom interface and suppress phase segregation. The reinforced and homogeneous anchorage by multiple repeat phosphonic acid groups onto NiO_x significantly optimised the bottom interface, suppressing unfavourable interfacial reactions and thus alleviating phase segregation of WBG perovskite. As a result, the PMDA-modified WBG PSCs showed higher power conversion efficiency (PCE) than the control device (19.84% vs. 18.18%), along with better device photostability (T₈₀ = 1200 vs. 500 h). Coupled with narrow bandgap (NBG) PSCs, the PMDA-modified PTSCs reached a PCE of up to 28.51% with device operation photostability over 700 h (T₈₀).

Keywords: Interfacial reaction; Phase segregation; Polymeric multi‐dentate anchoring; Tandem solar cells; Wide bandgap perovskite.

Abstract

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