接受者
材料科学
分子间力
富勒烯
离域电子
有机半导体
光诱导电荷分离
化学物理
光致发光
超快激光光谱学
聚合物
载流子
光化学
有机太阳能电池
电子受体
光谱学
分子
化学
有机化学
光电子学
光催化
量子力学
人工光合作用
凝聚态物理
催化作用
物理
复合材料
作者
Hilary M. Feier,Obadiah G. Reid,Natalie A. Pace,Jaehong Park,Jesse J. Bergkamp,Alan Sellinger,Devens Gust,Garry Rumbles
标识
DOI:10.1002/aenm.201502176
摘要
How free charge is generated at organic donor–acceptor interfaces is an important question, as the binding energy of the lowest energy (localized) charge transfer states should be too high for the electron and hole to escape each other. Recently, it has been proposed that delocalization of the electronic states participating in charge transfer is crucial, and aggregated or otherwise locally ordered structures of the donor or the acceptor are the precondition for this electronic characteristic. The effect of intermolecular aggregation of both the polymer donor and fullerene acceptor on charge separation is studied. In the first case, the dilute electron acceptor triethylsilylhydroxy‐1,4,8,11,15,18,22,25‐octabutoxyphthalocyaninatosilicon(IV) (SiPc) is used to eliminate the influence of acceptor aggregation, and control polymer order through side‐chain regioregularity, comparing charge generation in 96% regioregular (RR‐) poly(3‐hexylthiophene) (P3HT) with its regiorandom (RRa‐) counterpart. In the second case, ordered phases in the polymer are eliminated by using RRa‐P3HT, and phenyl‐C 61 ‐butyric acid methyl ester (PC 61 BM) is used as the acceptor, varying its concentration to control aggregation. Time‐resolved microwave conductivity, time‐resolved photoluminescence, and transient absorption spectroscopy measurements show that while ultrafast charge transfer occurs in all samples, long‐lived charge carriers are only produced in films with intermolecular aggregates of either RR‐P3HT or PC 61 BM, and that polymer aggregates are just as effective in this regard as those of fullerenes.
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