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Temperature Effects on Photocurrent Generation in Polymer Hetero—Junction Photovoltaic Devices

Published online by Cambridge University Press:  01 February 2011

Mi Yeon Song ,
Kang-Jin Kim  and
Dong Yong Kim
Mi Yeon Song
Affiliation:
Optoelectronic Materials Research Center, Korea Institute of Science and Technology, P.O. Box 131. Cheongryang, Seoul 130–650, Korea
Kang-Jin Kim
Affiliation:
Department of Chemistry and Molecular Engineering, Korea University, Seoul 136–701, Korea
Dong Yong Kim
Affiliation:
Optoelectronic Materials Research Center, Korea Institute of Science and Technology, P.O. Box 131. Cheongryang, Seoul 130–650, Korea
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Abstract

In a heterojunction photovoltaic device of ITO/TiO2/poly(3-alkylthiophene)/Au, the photocurrent was characterized with different temperature by using regio-random (P3HT), regular (RP3HT) poly(3-hexylthiophene) and regio-regular poly(3-dodecylthiophene)(RP3DT). The regio-regularity and alky chain length affected the photovoltaic characteristics due to the difference in the hole carrier transport. The drift charge mobility of those devices were analyzed by the space charge limited current (SCLC) theory using dark current versus bias relations. The photocurrent in the devices based on poly(3-alkylthiopene)s began to decrease rapidly below a temperature at which the drift charge mobility was 10−5 cm2/V.s.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 836: Symposium L – Materials for Photovoltaics , 2004 , L5.5
Copyright
Copyright © Materials Research Society 2005

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References

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