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Proceedings Paper

Interdigitated photoconductors using organic and small molecule materials
Author(s): A. C. Niemeyer; I. H. Campbell; F. So; B. K. Crone
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Paper Abstract

In this study we present research results on interdigitated organic / small molecule photoconductors. We investigated photoconductivity in interdigitated lateral photoconductors with aluminum contacts, using (1) a spin-coated organic blend and (2) evaporated organic multilayers as the active layer. The spin-coated devices were made with a blend of a poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene] [MEH-PPV] and {6}-1-(3-(methoxycarbonyl) propyl)-{5}-1-phenyl-[6,6]-C61 [PCBM]. In spin-cast devices, the quantum efficiency was limited by the dissociation of the excitons. The field dependence of the dissociation of the excitons was explained using a modified Onsager model for charge dissociation. The evaporated devices were made from layers of alpha-sexithiophene [α-6T] and C60. In the evaporate devices, trap sites in the active layer limited the quantum efficiency. By modeling the quantum efficiency based on exciton diffusion to the interface and the dissociation of the excitons, the experimental quantum efficiency was explained by a trapping model with a charge carrier lifetime of 0.002s.

Paper Details

Date Published: 26 August 2008
PDF: 7 pages
Proc. SPIE 7052, Organic Photovoltaics IX, 70520O (26 August 2008); doi: 10.1117/12.793876
Show Author Affiliations
A. C. Niemeyer, Los Alamos National Lab. (United States)
Univ. of Florida (United States)
I. H. Campbell, Los Alamos National Lab. (United States)
F. So, Univ. of Florida (United States)
B. K. Crone, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 7052:
Organic Photovoltaics IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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