Ms. Alyson C. Niemeyer Profile

Alyson C. Niemeyer

at Los Alamos National Lab

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Proceedings Article | 26 August 2008 Paper

Interdigitated photoconductors using organic and small molecule materials

A. Niemeyer, I. Campbell, F. So, B. Crone

Proceedings Volume 7052, 70520O (2008) https://doi.org/10.1117/12.793876

KEYWORDS: Quantum efficiency, Excitons, Electrodes, Diffusion, Interfaces, Heterojunctions, Photoresistors, Absorption, Data modeling, Molecules

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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.

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