Journal Article

FZJ-2026-01212

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Cooperative Dipole Engineering Unlocks 92.8% Shockley–Queisser Voltage Limit in Wide-Bandgap Perovskites for Tandem Photovoltaics

Ji, S.-G. ; Noh, E. ; Kim, J. ; Duan, W. ; Kang, B. J. ; Lee, Y. ; Ding, K.FZJ* ; Seok, S. I. (Corresponding author)

2026
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsenergylett.5c02738  doi:10.34734/FZJ-2026-01212

Abstract: Wide-bandgap (WBG) perovskite solar cells (PSCs, Eg ≃ 1.67 eV) still suffer from pronounced open-circuit-voltage (VOC) deficits. Here, we report a synergistic surface-passivation strategy that coassembles a dipolar quaternary-ammonium salt, acetylcholine chloride (ACCl), with an electron-rich long-chain alkylammonium halide, n-octylammonium iodide (OAI). A mixed ACCl:OAI treatment reconstructs the perovskite surface, lowers surface-trap density, and aligns the valence band with the hole-transport layer. Consequently, the champion WBG PSC delivers VOC = 1.29 V, JSC = 20.0 mA cm–2, FF = 82.8%, and PCE = 21.27%, corresponding to 92.8% of the Shockley–Queisser voltage limit. When integrated as the top absorber in a monolithic n-i-p perovskite/p-type Si tandem, the passivated WBG cell contributed to a PCE of 26.8% with a VOC of 1.91 V. These results reveal that cooperative defect passivation and energy-level engineering are both essential to unlock the full voltage potential of WBG perovskites.

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Contributing Institute(s):

1. Photovoltaik (IMD-3)

Research Program(s):

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

Appears in the scientific report 2026

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 20 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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