Ammonium Hexafluoroaluminate Mediated Charge Compensation in Nickel Oxide and Interface Regulation for Heat-Resilient Perovskite Solar Cells
Wenlei Lv , Zongzheng Li , Jia Kou , Zhijie Gao , Yu Wang , Yansheng Chen , Chaorong Guo , Wei Cheng , Lingying Ren , Peng Huang
Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (13) : 2086 -2094.
Thermal instability originating from the buried interface, particularly the conductivity-stability paradox characteristic of nickel oxide hole transport layers, severely impedes the commercialization of inverted perovskite solar cells (PSCs). Herein, we introduce ammonium hexafluoroaluminate (AHA) as a multifunctional interfacial layer to reconcile this contradiction and regulate the buried perovskite interface. We elucidate a charge compensation mechanism wherein AlF63– anions coordinate with surface Ni2+ via F– ions while NH4+ cations fill nickel vacancies. These processes collectively promote Ni3+ generation, thereby enhancing conductivity without inducing parasitic reactions. Simultaneously, AHA modulates perovskite crystallization through Lewis acid-base and hydrogen bonding interactions, yielding high-quality films with mitigated strain and favorable energy alignment. Consequently, inverted PSCs incorporating AHA achieve a champion power conversion efficiency of 26.07%. Furthermore, the devices demonstrate exceptional thermal resilience by retaining 90.8% of their initial efficiency after 1100 h of aging at 85 °C under the ISOS-D-2I protocol.
Nickel oxide / Buried interface / Defect passivation / Mitigated strain / Inverted perovskite solar cells / Device stability
2026 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
/
| 〈 |
|
〉 |
PDF
