Journal ArticleDOI
Ultrafast field-induced dissociation of excitons in conjugated polymers
R. Kersting,Uli Lemmer,M. Deussen,H. J. Bakker,Rainer F. Mahrt,Heinrich Kurz,Vladimir Arkhipov,Heinz Bässler,Ernst O. Göbel +8 more
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TLDR
The experimental results suggest that the photocarriers in conjugated polymers are not formed directly but result from dissociation of excitons, which is explained by the interplay of the dissociation and the spectral relaxation of the exciton within an inhomogeneously broadened density of states.Abstract:
We present a time-resolved study of the field-induced luminescence quenching in poly(phenylphenylenevinylene) using femtosecond luminescence spectroscopy. The dynamic quenching of the luminescence reveals a delay between the generation of excitons and their breakup into geminate electron-hole pairs. We explain the data by the interplay of the dissociation and the spectral relaxation of the excitons within an inhomogeneously broadened density of states. Our experimental results suggest that the photocarriers in conjugated polymers are not formed directly but result from dissociation of excitons.read more
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Small molecular weight organic thin-film photodetectors and solar cells
TL;DR: In this paper, the double heterojunction was proposed to confine excitons within the active layers, allowing substantially higher internal efficiencies to be achieved, and a full optical and electrical analysis of the double-heterostructure architecture leads to optimal cell design as a function of the optical properties and exciton diffusion lengths of the photoactive materials.
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Device Physics of Polymer:Fullerene Bulk Heterojunction Solar Cells
TL;DR: In this paper, the authors review the processes and limitations that govern device operation of polymer-fullerene BHJ solar cells, with respect to the charge-carrier transport and photogeneration mechanism.
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Efficient two layer leds on a polymer blend basis
J. Pommerehne,Horst Vestweber,Werner Guss,Rainer F. Mahrt,Heinz Bässler,Michael Porsch,Jörg Daub +6 more
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Charge separation and photovoltaic conversion in polymer composites with internal donor/acceptor heterojunctions
G. Yu,A. J. Heeger +1 more
TL;DR: In this article, a phase-separated polymer blend (composite) made with poly[2methoxy]-5−(2′−ethylhexyloxy)‐1,4‐phenylene vinylene], MEH‐PPV, as donor and cyano-PPV (CN•PPV), as acceptor, is described.
Journal ArticleDOI
Improved quantum efficiency for electroluminescence in semiconducting polymers.
TL;DR: The results imply that the exciton binding energy is weak, or that singlet bound states are formed with higher probability than triplets, in polymer light-emitting diodes, attained by blending electron transport materials with the conjugated polymer to improve the injection of electrons.