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Operation of a reversed pentacene-fullerene discrete heterojunction photovoltaic device
Author(s) -
D. M. Nanditha,
M.A.K.L. Dissanayake,
Ross A. Hatton,
Richard J. Curry,
S. Ravi P. Silva
Publication year - 2007
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.2713345
Subject(s) - pentacene , heterojunction , photocurrent , materials science , optoelectronics , charge carrier , organic solar cell , nanoclusters , fullerene , exciton , organic semiconductor , context (archaeology) , bilayer , electrode , chemistry , nanotechnology , physics , condensed matter physics , polymer , paleontology , biochemistry , organic chemistry , layer (electronics) , membrane , composite material , biology , thin film transistor
The photoresponse of reversed bilayer organic photovoltaic device based on pentacene and C60 is examined, and the mechanism of photocurrent generation is shown to be different to that in conventional heterojunction devices, with free charge carriers generated at the electrode-organic interfaces rather than the organic heterojunction. This hypothesis is tested with silver nanoclusters incorporated at the organic heterojunction to quench excitons and facilitate recombination of free charge carriers, which shows a predicted increase in Jsc. The large Voc in this reversed cell structure is also rationalized in the context of the model proposed.

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