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Fourier Transform Infrared Absorbance and Photoluminescence Spectroscopy Studies of CdSe Colloidal Quantum Dot/Conducting Polymer Nanocomposites for Application to Infrared Photodetectors

Published online by Cambridge University Press:  01 February 2011

Kevin R. Lantz  and
Adrienne D. Stiff-Roberts
Kevin R. Lantz
Affiliation:
[email protected], Duke University, Electrical and Computer Engineering, Box 90291, Durham, NC, 27708-0291, United States
Adrienne D. Stiff-Roberts
Affiliation:
[email protected], Duke University, Electrical and Computer Engineering, Box 90291, Durham, NC, 27708-0291, United States
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Abstract

In this paper we investigate the optical properties of four CdSe colloidal quantum dot/conducting polymer nanocomposites deposited on GaAs substrates using photoluminescence and Fourier transform infrared spectroscopy absorbance. The purpose of this investigation is to find an appropriate electron-conducting polymer for use in a photoconductor that utilizes intraband transitions in the conduction band to detect mid- to long-wave-infrared radiation. As a feasibility demonstration, we fabricate a two-terminal photoconductor and characterize its dark current and spectral responsivity (at 125 K), demonstrating intraband peaks at 0.465 and 0.527 eV, which correspond to 2.67 and 2.35μm.

Keywords

optical propertiesinfrared (IR) spectroscopyabsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1015: Symposium BB – Hybrid Functional Materials for Optical Applications , 2007 , 1015-BB06-12
Copyright
Copyright © Materials Research Society 2007

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