Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3182787
Keywords
excitons; fullerenes; impurity states; multilayers; organic compounds; photoconductivity; photodetectors; photoexcitation
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Funding
- U. S. Department of Energy [DE-FG02-07ER46474]
- Korea Foundation
- U.S. Department of Energy (DOE) [DE-FG02-07ER46474] Funding Source: U.S. Department of Energy (DOE)
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We employ an exciton fission process that converts one singlet exciton into two triplet excitons to increase the quantum efficiency of an organic multilayer photodetector beyond 100%. The photodetector incorporates ultrathin alternating donor-acceptor layers of pentacene and C(60), respectively. By comparing the quantum efficiency after separate pentacene and C(60) photoexcitation we find that singlet exciton fission in pentacene enhances the quantum efficiency by (45 +/- 7)%. In quantitative agreement with this result, we also observe that the photocurrent generated from pentacene excitons is decreased by (2.7 +/- 0.2)% under an applied magnetic field of H=0.4 T, while the C(60) photocurrent is relatively unchanged.
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