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Effect of Sol-Gel-Derived ZnO Interfacial Layer on the Photovoltaic Properties of Polymer Solar Cells

Authors
Kim, JYLee, HPark, JLee, DSong, HJKwak, JLee, C
Issue Date
Oct-2012
Publisher
IOP Publishing Ltd
Citation
Japanese Journal of Applied Physics, v.51, no.10
Journal Title
Japanese Journal of Applied Physics
Volume
51
Number
10
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147573
DOI
10.1143/JJAP.51.10NE29
ISSN
0021-4922
1347-4065
Abstract
The effect of a zinc oxide (ZnO) interfacial layer on the device performance of polymer solar cells based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) was studied. When a 15 nm ZnO layer was inserted between the active layer (P3HT:PCBM) and Al electrode, the power conversion efficiency (PCE) was increased by approximately 10% as compared to that without ZnO layer. From the systematic analysis of the current-voltage and impedance characteristics of devices with and without the ZnO layer at various temperatures and light intensities, we found that the device with the ZnO layer has a lower activation energy for carrier extraction and bimolecular recombination loss compared with that without the ZnO layer. Therefore, the enhanced efficiency of the device with ZnO is mainly attributed to the enhanced extraction efficiency and thereby increased short-circuit current density. (C) 2012 The Japan Society of Applied Physics
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