Title

Evidences of photocurrent generation by hole-exciton interaction at organic semiconductor interfaces

Document Type

Journal Article

Publisher

Elsevier

Faculty

Health, Engineering and Science

School

Electron Science Research Institute

RAS ID

21504

Comments

This article was originally published as: 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. Original article available here

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.

DOI

10.1016/j.orgel.2015.07.024

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