301. A Comparative Study on Hole Transfer Inversely Correlated with Driving Force in Two Non-Fullerene Organic Solar Cells.
- Author
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Wang J, Xu J, Yao N, Zhang D, Zheng Z, Xie S, Zhang X, Zhang F, Zhou H, Zhang C, and Zhang Y
- Abstract
We report a faster rate of hole transfer under a smaller Δ
HOMO in a comparative study of two group organic solar cells (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 rate of transfer of a hole 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, slower recombination, and rapid charge extraction enabled by desired morphology and balanced charge carrier mobilities with PBDBT-SF, suggesting that under a sufficiently high ΔHOMO , comprehensive considerations of the transport, film morphology, and energy levels are needed when designing new materials for high-performance OSCs.- Published
- 2019
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