Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 42, Issue 14, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0022-3727/42/14/145103
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Funding
- CSIR, Government of India [03/1016/05/EMR-II]
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The photovoltaic properties of devices based on a new combination, pentacene/[6,6]-phenyl C-61 butyric acid methyl ester (PCBM) bilayer hetero-junctions, were investigated. The crystallinity of pentacene was found to be improved by depositing a PEDOT : PSS layer on an indium tin oxide substrate, which in turn doubled the power conversion efficiency of the device. The PCBM layer showed a significant contribution to the device photocurrent, which originated mainly due to the dissociation of excitons at the pentacene/PCBM interface. By optimizing the thickness of the pentacene and PCBM layers, a broader photo-response was obtained in the external quantum efficiency spectra indicating efficient light harvesting throughout the visible region of the solar spectrum.
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