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A Comparative Study on Hole Transfer Inversely Correlated with Driving Force in Two Non-Fullerene Organic Solar Cells.

We report a faster rate of hole transfer under smaller ΔHOMO in a comparative study on two group OSCs consisting of IT-4F as an acceptor and PBDBT and PBDBT-SF as donors. In the OSCs based on PBDBT-SF:IT-4F, a higher short-circuit current ( JSC) was observed with a ΔHOMO of 0.31 eV compared to a lower JSC in PBDBT:IT-4F OSCs with a larger ΔHOMO (0.45 eV). Intensive investigation indicates that the hole transfer rate from IT-4F to PBDBT-SF or PBDBT is inversely proportional to the ΔHOMO between IT-4F and donors. The larger JSC in the PBDBT-SF:IT-4F device is attributed to a synergy of faster hole transfer, reduced recombination and rapid charge extraction enabled by desired morphology and balanced charge carrier mobilities with PBDBT-SF, which suggests that under a sufficiently high ΔHOMO, comprehensive considerations on the transport, film morphology and energy levels are needed when designing new materials for high performance OSCs.