Multifunctional small molecule interface management for efficient planar perovskite solar cells

This is the authors' abstract. We don't add key points for this paper.

Establishing an optimal configuration for the electron transport layer (ETL) and a compliant perovskite interface is pivotal in advancing the creation of high-performance, hysteresis-free, and resilient perovskite solar cells (PSCs). Amongst various strategies, interface engineering emerges as a highly feasible and potent means to alleviate interfacial non-radiative recombinations, issues typically rooted in defects, tensile stresses, and energy level discrepancies at the interface. Our investigation solidifies the efficacy of incorporating Imidazolium Salt (NOI:1N-3-acetic acid-imidazole) within the SnO2/perovskite interface as a strategic intervention for remodeling this vital frontier. The integration of NOI fosters a synergistic interface, seamlessly bridging the perovskite with the SnO2 ETL, effectively mitigating tensile strains and passivating underlying interface defects. Implementation of the NOI-based treatment regimen has notably propelled device performance, evidenced by a PCE escalation from 21.5% to 23.3%, coupled with a marked increase in open-circuit voltage (VOC) from 1.15 V to 1.18 V. Consequently, this methodology presents a concise yet powerful pathway for augmenting PSCs' operational excellence.