题目：

Unraveling the role of substrates on interface energetics and morphology of PCDTBT:PC₇₀BM bulk heterojunction

作者：

Yu Zhou , Chi Li , Hao-Jun Xie , Yan-Qing Li , Steffen Duhm , and Jian-Xin Tang*

单位：

Institute of Functional Nano and Soft Materials (FUNSOM)，Collaborative Innovation Center of Suzhou Nano Science and Technology，Jiangsu Key Laboratory for Carbon-Based Functional

Materials and Devices， Soochow University, Suzhou 215123, People’s Republic of China

摘要：

In the pursuit of developing highly effi cient polymer solar cells, it is indispensable to experimentally determine the molecular electronic and geometrical structures of distributed donor/acceptor bulk heterojunctions for understanding the processes inside the cell. In this article, substrate effect on interface energetics and film morphology of the poly[N-9′-heptadecanyl-2,7- carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]:[6,6]-phenyl-C 70butyric acid methyl ester (PCDTBT:PC₇₀BM) blends with various blending ratios on various conductive substrates is clarified based on the characterization of photoelectron spectroscopy and atomic force microscope, where the PCDTBT:PC₇₀BM blend fi lm serves as an important model system due to efficient charge generation and transport with low recombination. The energetics of the PCDTBT:PC 70 BM blend film is demonstrated to be highly dependent on the substrate work function, showing the transition from vacuum level alignment to Fermi level pinning with the variation of PC₇₀BM ratio in the blend fi lm. The resulting morphology is in good agreement with the observed formation of a PCDTBT-rich layer at the top of the PCDTBT:PC₇₀BM blend film irrespective of the variation of the PC₇₀BM blending ratio and annealing temperature. The results show the possibility of tuning the interfacial electronic structures by utilizing the substrate effects and potential applications on performance enhancement in polymer solar cells.

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因子：

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情况：

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链接：

http://onlinelibrary.wiley.com/doi/10.1002/admi.201500095/abstract