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Journal of Applied Physics : The dissociation of excitons at indium tin oxide-copper phthalocyanine interface in organic solar cells

By X. Y. Sun, Q. L. Song, M. L. Wang, X. M. Ding, X. Y. Hou et al

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Book Id: WPLBN0002169383
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 17 November 2008

Title: Journal of Applied Physics : The dissociation of excitons at indium tin oxide-copper phthalocyanine interface in organic solar cells  
Author: X. Y. Sun, Q. L. Song, M. L. Wang, X. M. Ding, X. Y. Hou et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
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Publication Date:
Publisher: American Institute of Physics

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Sun, Q. L. Song, M. L. Wang, X. M. Ding, X. Y. Hou Et A, X. Y. (n.d.). Journal of Applied Physics : The dissociation of excitons at indium tin oxide-copper phthalocyanine interface in organic solar cells. Retrieved from http://hawaiilibrary.net/


Description
Description: Exciton dissociation process at indium tin oxide (ITO)/copper phthalocyanine (CuPc) interface of ITO/CuPc(370 nm)/Al is studied by transient photovoltage method. A negative-to-positive change in the polarity of photovoltage upon pulsed laser irradiation is observed in CuPc thin film. The polarity change is regarded as a summation of the effect of exciton dissociation at ITO/CuPc interface (fast process) and that of free carrier separation by built-in field (slow process). Further experiments confirm the existence of exciton dissociation at ITO/CuPc interface, and the direction of which is electron injected into ITO, with holes left in CuPc film. This is opposite to that of the interfacial dissociation at donor/acceptor (D/A) interface in single heterojunction cells (ITO/D/A/buffer/Al). 3-nm-thick LiF insulating layer is inserted between ITO and CuPc to inhibit the exciton dissociation at ITO/CuPc interface. Thereby, the open-circuit voltage and power conversion efficiency of the single layer cell have been increased by several times.

 

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