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Influence of Semiconductor Nanocrystal Concentration on Polymer Hole Transport in Hybrid Nanocomposites
Department of Electrical and Computer Engineering, Duke University, Box 90291, Durham, NC 27708, USA
* Author to whom correspondence should be addressed.
Received: 1 November 2011; in revised form: 30 December 2011 / Accepted: 10 January 2012 / Published: 16 January 2012
Abstract: This article investigates hole transport in poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV)/CdSe colloidal quantum dot (CQD) nanocomposites using a modified time-of-flight photoconductivity technique. The measured hole drift mobilities are analyzed in the context of Bässler’s Gaussian disorder model and the correlated disorder model in order to determine the polymer internal morphology of hybrid nanocomposite thin films. This work shows that increasing the CdSe CQD concentration decreases the polymer hole mobility from ~5.9 × 10−6 cm2/Vs in an MEH-PPV film to ~8.1 × 10−8 cm2/Vs in a 20:80 (wt%) MEH-PPV:CdSe CQD nanocomposite film (measured at 25 °C and ~2 × 105 V/cm). The corresponding disorder parameters indicate increasing disruption of interchain interaction with increasing CQD concentration. This work quantifies polymer chain morphology in hybrid nanocomposite thin films and provides useful information regarding the optimal use of semiconductor nanocrystals in conjugated polymer-based optoelectronics.
Keywords: hybrid nanocomposites; hole drift mobility; time-of-flight photoconductivity; amorphous disorder models
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Pate, R.; Stiff-Roberts, A.D. Influence of Semiconductor Nanocrystal Concentration on Polymer Hole Transport in Hybrid Nanocomposites. Crystals 2012, 2, 78-89.
Pate R, Stiff-Roberts AD. Influence of Semiconductor Nanocrystal Concentration on Polymer Hole Transport in Hybrid Nanocomposites. Crystals. 2012; 2(1):78-89.
Pate, Ryan; Stiff-Roberts, Adrienne D. 2012. "Influence of Semiconductor Nanocrystal Concentration on Polymer Hole Transport in Hybrid Nanocomposites." Crystals 2, no. 1: 78-89.