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Binary Organic Solar Cells Breaking 19 via Manipulating the Vertical Component Distribution

机译:Binary Organic Solar Cells Breaking 19 via Manipulating the Vertical Component Distribution

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摘要

The variation of the vertical component distribution can significantly influencethe photovoltaic performance of organic solar cells (OSCs), mainly dueto its impact on exciton dissociation and charge-carrier transport and recombination.Herein, binary devices are fabricated via sequential deposition (SD)of D18 and L8-BO materials in a two-step process. Upon independently regulatingthe spin-coating speeds of each layer deposition, the optimal SD deviceshows a record power conversion efficiency (PCE) of 19.05 for binary singlejunctionOSCs, much higher than that of the corresponding blend casting(BC) device (18.14). Impressively, this strategy presents excellent universalityin boosting the photovoltaic performance of SD devices, exemplified byseveral nonfullerene acceptor systems. The mechanism studies reveal thatthe SD device with preferred vertical components distribution possesses highcrystallinity, efficient exciton splitting, low energy loss, and balanced chargetransport, resulting in all-around enhancement of photovoltaic performances.This work provides a valuable approach for high-efficiency OSCs, sheddinglight on understanding the relationship between photovoltaic performanceand vertical component distribution.

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