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Proceedings Paper

Characteristics of organic solar cells with various cathodes and n-type organic semiconductors
Author(s): Jay Chang; Hong-Long Cheng; Shyh-Jiun Liu; Szu-Yu Lin; Fu-Ching Tang; Jen-Sue Chen; Steve Lien-Chung Hsu; Yu-Jen Wang; Wei-Yang Chou
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Paper Abstract

The influence of the cathode electrode on the characteristics of pentacene/perylene derivatives based organic solar cells was analysed by means of absorption, photoluminescence, and X-ray spectroscopies. We report the characteristics of a series of organic solar cells fabricated with Al, Ag, and Au electrodes for the interface between metals and organic semiconductors, which play a central role in the physics of organic solar cells. Donor and acceptor layers of a solar cell were pentacene and N,N'-dioctyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-8C) and N,N'-ditridecyl-3,4,9,10-perylene-tetracarboxylic diimide (PTCDI-13C) respectively. Two organic solar cells with pentacene/PTCDI-8C and pentacene/PTCDI-13C heterojunctions as active layers were fabricated to compare the influence of power conversion efficiency among perylene derivatives with various numbers of carbon molecules by means of J-V measurements. Under the sunlight simulator with an AM1.5G filter and power of 100 mW/cm2, the solar cells of the pentacene/PTCDI-13C heterojunction with the Ag cathode had J-V characteristics of short-circuit current density of 0.415 mA/cm2, open-circuit voltage of 0.413 V, fill factor of 0.55, and power conversion efficiency of 0.1%, which were better than those of the pentacene/PTCDI-8C heterojunction. Moreover, according to the thin film analysis, the PTCDI-13C thin film's excitons at the interface of the heterojunction for dissociation were more, and the probability of radiative recombination of the electron-hole pair was less than for the PTCDI-8C. The PTCDI-13C thin-film possessed better carrier mobility than PTCDI-8C. Therefore, we could conclude that the factors mentioned above are keys to the pentacene/PTCDI-13C-based solar cells' better power conversion efficiency. The carrier transportation mechanism of these solar cells is discussed clearly.

Paper Details

Date Published: 10 September 2008
PDF: 9 pages
Proc. SPIE 7045, Photovoltaic Cell and Module Technologies II, 70450D (10 September 2008); doi: 10.1117/12.792715
Show Author Affiliations
Jay Chang, National Cheng Kung Univ. (Taiwan)
Hong-Long Cheng, National Cheng Kung Univ. (Taiwan)
Shyh-Jiun Liu, National Univ. of Tainan (Taiwan)
Szu-Yu Lin, National Cheng Kung Univ. (Taiwan)
Fu-Ching Tang, National Cheng Kung Univ. (Taiwan)
Jen-Sue Chen, National Cheng Kung Univ. (Taiwan)
Steve Lien-Chung Hsu, National Cheng Kung Univ. (Taiwan)
Yu-Jen Wang, Industrial Technology Research Institute (Taiwan)
Wei-Yang Chou, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7045:
Photovoltaic Cell and Module Technologies II
Bolko von Roedern; Alan E. Delahoy, Editor(s)

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