材料科学
化学物理
光电流
相(物质)
重组
电荷(物理)
溶剂
接受者
分子
形态学(生物学)
载流子
化学工程
小分子
纳米尺度
纳米技术
光电子学
化学
有机化学
凝聚态物理
生物化学
量子力学
生物
遗传学
工程类
物理
基因
作者
Aung Ko Ko Kyaw,Dong Hwan Wang,Cheng Luo,Yong Cao,Thuc‐Quyen Nguyen,Guillermo C. Bazan,Alan J. Heeger
标识
DOI:10.1002/aenm.201301469
摘要
The effects of solvent additive (1,8‐diiodooctane (DIO)) on the morphology, charge generation, transport, and recombination in solution‐processed small‐molecule solar cells are studied and these parameters are correlated with device performance. In the optimum nanoscale morphology, which is processed with 0.4% DIO, the phase separation is large enough to create a percolating pathway for carrier transport, yet still small enough to form large interfacial area for efficient charge separation. Complete phase separation in this film reduces the interfacial defects, which occurs without DIO, and hence suppresses the monomolecular recombination. Moreover, balanced charge transport and weak bimolecular recombination lead to a high fill factor (72%). On the other hand, an excess amount of DIO (0.8%) in the solvent results in the over‐aggregation of the donor phase, which disturbs the percolating pathway of the acceptor phase and reduces the electron mobility. The over‐aggregation of the donor phase also shrinks the interfacial area for charge separation and consequently reduces the photocurrent generation.
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