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Reduced exciton binding energy in organic semiconductors: Tailoring the Coulomb interaction
Author(s) -
Engel Miriam,
Kunze Frederik,
Lupascu Doru C.,
Benson Niels,
Schmechel Roland
Publication year - 2012
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105488
Subject(s) - exciton , organic semiconductor , pentacene , semiconductor , coulomb , organic solar cell , electric field , optoelectronics , energy conversion efficiency , materials science , permittivity , photovoltaics , screening effect , binding energy , chemical physics , nanotechnology , condensed matter physics , chemistry , physics , dielectric , atomic physics , polymer , photovoltaic system , quantum mechanics , electrical engineering , electron , engineering , layer (electronics) , composite material , thin film transistor
For organic photovoltaics (OPV) the maximum in obtainable power conversion efficiency is limited by a low semiconductor permittivity and the resulting enhanced Coulomb interaction (CI). This, however, is an aspect rarely addressed in the OPV development. Here, a concept is introduced which allows a reduced CI in organic semiconductors. This is the result of a device structure, which upon exciton formation forces part of the electric field between complementary charges through a high‐ k material, resulting in partial field screening and as such a reduced CI. The feasibility of this concept is substantiated by an investigation on the exciton separation efficiency in pentacene devices. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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