Mitigating the Heterointerface Driven Instability in Perovskite Photovoltaics AITranslate

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DOI：https://doi.org/10.1021/acsenergylett.3c01029

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Metal halide perovskites have the potential to revolutionize the field of photovoltaics, though limited stability has impeded commercial exploitation. The soft heterointerface between the perovskite and charge-transporting layer is one of the major bottlenecks that limits operational stability. Here, we present rationally designed molecular modulators that synergistically improve the stability of the α-FAPbI3-based perovskite solar cells while retaining power conversion efficiency (PCE) of 24.0% with a high open-circuit voltage (VOC) of ∼1.195 V. The interfacially modified photovoltaic cells exhibit high operational stability, whereby the champion device retains ∼88% of initial performance after 2000 h of maximum power point tracking at 40 °C and 1 sun illumination. The molecular origins of such enhanced stability and device performance are corroborated by multiscale characterization techniques and modeling, providing insights into the origins of performance and stability enhancements.