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Experimental and Theoretical Investigation of Photosensitive ITO/PEDOT:PSS/MEH-PPV/Al Detector

Published online by Cambridge University Press:  31 January 2011

Leon Rohan Pinto ,
Jovana Petrovic ,
Petar Matavulj ,
David Keith Chambers ,
Difei Qi  and
Sandra Zivanovic Selmic
Leon Rohan Pinto
Affiliation:
[email protected], Louisiana Tech University, Institute for Micromanufacturing, Ruston, Louisiana, United States
Jovana Petrovic
Affiliation:
[email protected], University of Belgrade, Faculty of Electrical Engineering, Belgrade, Serbia
Petar Matavulj
Affiliation:
[email protected], University of Belgrade, Faculty of Electrical Engineering, Belgrade, Serbia
David Keith Chambers
Affiliation:
[email protected], Louisiana Tech University, Institute for Micromanufacturing, Ruston, Louisiana, United States
Difei Qi
Affiliation:
[email protected], Louisiana Tech University, Institute for Micromanufacturing, Ruston, Louisiana, United States
Sandra Zivanovic Selmic
Affiliation:
[email protected], Louisiana Tech University, Institute for Micromanufacturing, Ruston, Louisiana, United States
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Abstract

One of widely investigated materials for photodiode, light-emitting device, and solar cell applications is a soluble conjugated polymer poly(2-methoxy-5- (2,9-ethyl-hexyloxy)-1,4-phenylene vinylene) or MEH-PPV. In this paper we present experimental results on MEH-PPV polymer and ITO/PEDOT:PSS/MEH-PPV/Al photodetector, where ITO and PEDOT:PSS stand for indium tin oxide and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), respectively. Thin polymer films were fabricated by spin-coating technique. The characterization of the material and devices are done in air at room temperature. The experimental results include optical absorption of MEH-PPV and determination of the optical absorption coefficient, photocurrent dependence on optical power, light wavelength, bias voltage, and polymer thin film thickness. Theoretical modeling is based on drift-diffusion and continuity equations for hole polarons, as well as assumption that the charge carrier recombination process is bimolecular. The bimolecular recombination mechanism implies that the photocurrent depends on the square root of the optical power, which is confirmed with our experimental results.

Keywords

polymeroptoelectronicsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1190: Symposium NN – Active Polymers , 2009 , 1190-NN11-01
Copyright
Copyright © Materials Research Society 2009

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