Publication date: 11th March 2026
Abstract
Inverted perovskite solar cells (PSCs) have rapidly emerged as leading candidates for next-generation photovoltaics owing to their high power conversion efficiencies (PCE) and superior stability. However, self-assembled monolayers (SAMs), which are widely used as efficient hole transport layers (HTL), still face several critical obstacles in the inverted PSC configuration. Notably, molecular disorder and suboptimal packing within the SAMs often result in poor perovskite film coverage, which increases detrimental interfacial recombination and accelerates overall device degradation.
In this work, we strategically introduce a functional passivating molecule at the interface between the SAM and the perovskite layer to address these issues and improve interfacial adhesion. This modification facilitates a more uniform nucleation process during perovskite deposition. As a result, the modified HTL significantly enhances coverage and suppresses non-radiative recombination at the buried interface, thereby increasing the open-circuit voltage ($V_{oc}$) and achieving a power conversion efficiency (PCE) exceeding 26%. These results suggest that precise molecular passivation plays a critical role in enhancing SAM structural integrity and reducing interfacial defects, consequently improving both the performance and long-term reliability of inverted PSCs.
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