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Proceedings Paper

Charge transfer and recombination at conjugated polymer-semiconductor nanoparticle interfaces
Author(s): Baoquan Sun; Sebastian Westenhoff; Anoop S. Dhoot; Carlos Silva; Neil C Greenham
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Paper Abstract

We study the processes of charge transfer and recombination at the interface between semiconductor nanoparticles and conjugated polymers. These processes are crucial in determining the performance of photovoltaic devices based on these materials. Using femtosecond transient absorption we are able to follow the charge separation on picosecond timescales in blends of spherical CdSe nanocrystals with a poly(p-phenylenevinylene) derivative. Charge separation occurs on timescales of greater than 15 ps, indicating that it is limited by the diffusion of excitons to the nanoparticle interface. We also use time-resolved photoluminescence and quasi-steady-state photoinduced absorption measurements to study the vertical structure in films containing conjugated polymers and semiconductor tetrapods. Finally, we demonstrate that use of slow-evaporating solvents allows the formation of fibrilar structures in poly(3-hexylthiophene) films, and that this is correlated with improved performance in photovoltaic devices containing poly(3-hexylthiophene) and CdSe nanorods.

Paper Details

Date Published: 14 October 2004
PDF: 10 pages
Proc. SPIE 5513, Physical Chemistry of Interfaces and Nanomaterials III, (14 October 2004); doi: 10.1117/12.559441
Show Author Affiliations
Baoquan Sun, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Sebastian Westenhoff, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Anoop S. Dhoot, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Carlos Silva, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Neil C Greenham, Cavendish Lab./Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5513:
Physical Chemistry of Interfaces and Nanomaterials III
Gregory V. Hartland; Xiao-Yang Zhu, Editor(s)

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