Evidences of photocurrent generation by hole-exciton interaction at organic semiconductor interfaces
Authors/Creators
Ping Li
Yu Jun Zhang
Lun Cai
Bao Fu Ding, Edith Cowan University
Jin Xiang
Gang Wang
Kamal Alameh, Edith Cowan UniversityFollow
Da Chen Zhou
Qun Liang Song
Abstract
The charge-exciton interaction at the donor/acceptor interface plays a significant role in the exciton dissociation processes, and thus influences the performance of organic solar cells. In this work, the evidences of photocurrent generation via hole-exciton interaction (HEI) at the organic semiconductor interface in organic solar cells, which is the counterpart of photocurrent generated by electron-exciton interaction, is demonstrated. A heterojunction, composed of copper phthalocyanine (CuPc) and fullerene (C60), is used to provide free holes that interact with the excitons supplied by perfluorinated hexadecafluorophthalo-cyaninatozinc (F16ZnPc). The fact that photocurrent generation via HEI is well evidenced by: (1) a short circuit current of 0.38 mA cm-2; (2) the jump of an external quantum efficiency (EQE) around 800 nm after adding a bias light; (3) the EQE variations under bias light of different wavelengths and light intensities; and (4) the superlinear dependence of the photocurrent on the light intensity.
Document Type
Journal Article
Date of Publication
2015
Faculty
Faculty of Health, Engineering and Science
Publisher
Elsevier
School
Electron Science Research Institute
RAS ID
21504
Copyright
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Comments
Li, P., Zhang, Y. J., Cai, L., Ding, B. F., Xiang, J., Wang, G., ... & Song, Q. L. (2015). Evidences of photocurrent generation by hole–exciton interaction at organic semiconductor interfaces. Organic Electronics, 26, 75-80. Available here