Journal Article

FZJ-2026-01040

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Anchoring ligand engineering enables highly stable MA-free perovskite solar cells with a minimal V OC deficit of 0.32 V

Li, C. (Corresponding author) ; Vincze, A. ; Park, H. ; Streller, F. ; Götz, K. ; Qiu, S. ; Byun, J. ; Shang, Y. ; Yuan, Z. ; Dong, L. ; Tian, J. ; Peng, Z. ; Liu, C.FZJ* ; Yang, F. ; Wang, Y.FZJ* ; Späth, A. ; Osvet, A. ; Forberich, K.FZJ* ; Heumueller, T.FZJ* ; Christiansen, S. H. ; Halik, M. ; Fink, R. H. ; Unruh, T. ; Li, N. ; Lüer, L. (Corresponding author)FZJ* ; Brabec, C. (Corresponding author)FZJ*

2025
RSC Publ. Cambridge

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Please use a persistent id in citations: doi:10.1039/D5EE03162A  doi:10.34734/FZJ-2026-01040

Abstract: Ligand engineering is an effective method to reduce defects in perovskite solar cells (PSCs) and to enhance efficiency. Likewise, enhancing device stability through ligand engineering is currently emerging as a key focus to suppress the bidirectional migration of halides and silver ions, which otherwise can cause irreversible chemical corrosion to the electrode and perovskite layer. Here, triphenylphosphine oxide (TPPO) is demonstrated to improve the long-term operational stability of PSCs when introduced at the interface between the perovskite and the electron transport layer (ETL). TPPO effectively eliminates uncoordinated Pb2+ and thus reduces surface defects. Accordingly, the target solar cell yields a hero power conversion efficiency (PCE) of 26.01% and a maximum open-circuit voltage (VOC) of 1.23 V, representing the minimum voltage deficit (0.32 V) reported for methylammonium-free (MA-free) PSCs. Moreover, long-term operational analysis reveals that the bidirectional migration of halides and silver ions is significantly suppressed, resulting in enhanced device stability. TPPO-modified PSCs retain 90% of the initial PCE after 1200 hours of operation in maximum power point tracking. Ligand engineering with TPPO marks a significant advancement in enhancing the stability of PSCs and is fully compatible to upscaling scenarios.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IET-2)

Research Program(s):

1. 1213 - Cell Design and Development (POF4-121) (POF4-121)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 30 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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