1,537 research outputs found
Theory of photoinduced charge transfer in weakly coupled donor-acceptor conjugated polymers: application to an MEH-PPV:CN-PPV pair
In a pair of coupled donor-acceptor conjugated polymer chains, it is possible
for an exciton photoexcited on either polymer to decay into a hole in the donor
polymer's valence band and an electron in the conduction band of the acceptor
polymer. We calculate the corresponding exciton decay rate and its dependence
on inter-polymer distance. For a pair of derivatives of poly(phenylene
vinylene), PPV, specifically poly[2-methoxy, 5-(2-ethyl-hexyloxy)-1, 4
PPV], MEH-PPV, and poly(2,5-hexyloxy -phenylene cyanovinylene), CN-PPV, at a
separation of 6 \AA the characteristic decay time is 2.2 ps, whereas at 4 \AA
it is fs.Comment: 9 pages, RevTeX, 4 PS files, to be published in a special issue of
Chem. Phy
Photoinduced absorption of conjugated polymer/C60 solutions: evidence of triplet-state photoexcitations and triplet-energy transfer in poly(3-alkylthiophene)
Negative capacitance in organic semiconductor devices: bipolar injection and charge recombination mechanism
We report negative capacitance at low frequencies in organic semiconductor
based diodes and show that it appears only under bipolar injection conditions.
We account quantitatively for this phenomenon by the recombination current due
to electron-hole annihilation. Simple addition of the recombination current to
the well established model of space charge limited current in the presence of
traps, yields excellent fits to the experimentally measured admittance data.
The dependence of the extracted characteristic recombination time on the bias
voltage is indicative of a recombination process which is mediated by localized
traps.Comment: 3 pages, 3 figures, accepted for publication in Applied Physics
Letter
Electron and energy transfer processes of photoexcited oligothiophenes onto tetracyanoethylene and C 60
Fabrication of large area photovoltaic devices containing various blends of polymer and fullerene derivatives by using the doctor blade technique
Fabrication of large area photovoltaic devices containing various blends of polymer and fullerene derivatives by using the doctor blade technique
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