Academic Journals Database
Disseminating quality controlled scientific knowledge

Monitoring Charge Exchange in P3HT-Nanotube Composites Using Optical and Electrical Characterisation

ADD TO MY LIST
 
Author(s): Alexandrou Ioannis | Lioudakis Emmanouil | Delaportas Dimitrios | Zhao CZ | Othonos Andreas

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 4;
Issue: 7;
Start page: 635;
Date: 2009;
Original page

ABSTRACT
Abstract Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential for use in optoelectronic devices such as solar cells and optical sensors. The density/total area of these heterojunctions is expected to increase with increasing SWNT concentration but the efficiency of solar cell peaks at low SWNT concentrations. Most researchers use current–voltage measurements to determine the evolution of the SWNT percolation network and optical absorption measurements to monitor the spectral response of the composites. However, these methods do not provide a detailed account of carrier transport at the concentrations of interest; i.e., near or below the percolation threshold. In this article, we show that capacitance–voltage (C–V) response of (metal)-(oxide)-(semiconducting composite) devices can be used to fill this gap in studying bulk heterojunctions. In an approach where we combine optical absorption methods withC–Vmeasurements we can acquire a unified optoelectronic response from P3HT-SWNT composites. This methodology can become an important tool for optoelectronic device optimization.

Tango Jona
Tangokurs Rapperswil-Jona

     Save time & money - Smart Internet Solutions