【摘 要】
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In situ cross-linking encapsulation has been demonstrated to be an efficient strategy for enhancing the humidity stability of perovskite solar cells(PSCs).In th
【机 构】
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State Key Laboratory for Physical Chemistry of Solid Surfaces,iChEM(Collaborative Innovation Center
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In situ cross-linking encapsulation has been demonstrated to be an efficient strategy for enhancing the humidity stability of perovskite solar cells(PSCs).In this study,a novel cross-linkable fullerene derivative,namely 1-(p-benzoate-(p-methylvinylbenzene)-indolino[2,3][60]fullerene(FPPS),was readily synthesized from commer-cially available building blocks in two steps.This FPPS was employed as an interfacial modifier on perovskite surfaces in inverted planar p-i-n PSCs.Owing to the fast interfacial charge extraction and efficient trap passivation,PSCs based on the cross-linked FPPS(C-FPPS)exhibited excellent performance.The PSCs had a top-performing power conversion efficiency(PCE)of 17.82％ with negli-gible hysteresis,compared to the control devices without C-PFFS(16.99％).Moreover,the strong water resistance of the C-FPPS interfacial layer distinctly enhances the ambient stability of PSC devices,exhibiting a t80(the time required to reach 80％ of the initial PCE)of 300 h under high-humidity conditions.This significantly surpasses the control devices,whose t80 was only 130 h.These results demonstrate that cross-linkable fullerene derivatives can be promising interfacial materials for designing high-effi-ciency,hysteresis-free,air-stable PSCs.
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