材料科学
光电流
聚合物太阳能电池
接受者
电子迁移率
有机太阳能电池
异质结
电子受体
光电子学
能量转换效率
聚合物
光化学
化学
物理
凝聚态物理
复合材料
作者
Ru‐Ze Liang,Maxime Babics,Akmaral Seitkhan,Kai Wang,Paul B. Geraghty,Sergei Lopatin,Federico Cruciani,Yuliar Firdaus,Marco Caporuscio,David J. Jones,Pierre M. Beaujuge
标识
DOI:10.1002/adfm.201705464
摘要
Abstract Achieving efficient bulk‐heterojunction (BHJ) solar cells from blends of solution‐processable small‐molecule (SM) donors and acceptors is proved particularly challenging due to the complexity in obtaining a favorable donor–acceptor morphology. In this report, the BHJ device performance pattern of a set of analogous, well‐defined SM donors— DR3TBDTT ( DR3 ), SMPV1 , and BTR —used in conjunction with the SM acceptor IDTTBM is examined. Examinations show that the nonfullerene “All‐SM” BHJ solar cells made with DR3 and IDTTBM can achieve power conversion efficiencies (PCEs) of up to ≈4.5% (avg. 4.0%) when the solution‐processing additive 1,8‐diiodooctane (DIO, 0.8% v/v) is used in the blend solutions. The figures of merit of optimized DR3:IDTTBM solar cells contrast with those of “as‐cast” BHJ devices from which only modest PCEs <1% can be achieved. Combining electron energy loss spectrum analyses in scanning transmission electron microscopy mode, carrier transport measurements via “metal‐insulator‐semiconductor carrier extraction” methods, and systematic recombination examinations by light‐dependence and transient photocurrent analyses, it is shown that DIO plays a determining role—establishing a favorable lengthscale for the phase‐separated SM donor–acceptor network and, in turn, improving the balance in hole/electron mobilities and the carrier collection efficiencies overall.
科研通智能强力驱动
Strongly Powered by AbleSci AI