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Fabrication and Photoelectrical Characteristics of Polymer-Organic-Blend Photodetectors

Published online by Cambridge University Press:  17 March 2011

Difei Qi ,
Kody Varahramyan  and
Sandra Selmic
Difei Qi
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
Kody Varahramyan
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
Sandra Selmic
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
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Abstract

Polymer optoelectronics and microelectronics have been recognized as next generation technologies. One of the widely investigated materials for photodiode, LED and solar cell applications is the insoluble conjugated polymer poly(p-phenylene vinylene) or PPV. In this paper we present experimental results of a blended polymer-organic compound photodiode. This diode is based on a soluble derivative of PPV, poly(2-methoxy-5- (2,9-ethyl-hexyloxy)-1,4- phenylene vinylene) or MEH-PPV, and the organic material ethyl viologen dibromide or EVD. In making the photodiodes, solutions of MEH-PPV and EVD were spin-coated on indium tin oxide coated glass substrates. The thicknesses of these polymer-organic thin films were approximately 190 nm. An aluminum cathode was deposited by thermal evaporation. These devices were illuminated under monochromatic light in UV and visible range wavelengths. These thin polymer-organic blend photodiodes have shown an eight-fold increase in responsivity and quantum efficiency compared to pure MEH-PPV photodiode devices. The increase in photoconductivity of blended MEH-PPV:EVD photodiodes may be due to charge transfer by EVD dication. The results from this work clearly demonstrate the application of the reported approach for the realization of polymer photodiodes with increased photoconductivity characteristics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 814: Symposium I – Flexible Electronics 2004-Materials and Device Technology , 2004 , I11.7
Copyright
Copyright © Materials Research Society 2004

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