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A series of 4-octyloxybenzyl-adducted fullerene derivatives (PCBOEs) were employed as the electron collection materials (ECMs) in CH3NH3PbI3-based planar heterojunction perovskite solar cells. The PCBOE-based devices exhibited lower power conversion efficiency… Click to show full abstract
A series of 4-octyloxybenzyl-adducted fullerene derivatives (PCBOEs) were employed as the electron collection materials (ECMs) in CH3NH3PbI3-based planar heterojunction perovskite solar cells. The PCBOE-based devices exhibited lower power conversion efficiency and larger hysteresis than the PCBM-based device owing to the low electron mobility of PCBOEs, which causes charge accumulation at the perovskite/ECM interface. Moreover, the photovoltage of the investigated devices is identical, which indicates that the band gap of CH3NH3PbI3 is predominant in determining the photovoltage in planar heterojunction PSCs.
Journal Title: Chemistry Letters
Year Published: 2017
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