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Journal of Photonics for Energy

Deconvoluting contributions of photoexcited species in polymer-quantum dot hybrid photovoltaic materials
Author(s): Elsa Couderc; Matthew J. Greaney; William Thornbury; Richard L. Brutchey; Stephen E. Bradforth
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Paper Abstract

Ultrafast transient absorption spectroscopy is used in conjunction with spectroelectrochemistry and chemical doping experiments to study the photogeneration of charges in hybrid bulk heterojunction (BHJ) thin films composed of poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b′]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and CdSe nanocrystals. Chemical doping experiments on hybrid and neat PCPDTBT:CdSe thin films are used to deconvolute the spectral signatures of the transient states in the near infrared. We confirm the formation and assignment of oxidized species in chemical doping experiments by comparing the spectral data to that from spectroelectrochemical measurements on hybrid and neat PCPDTBT:CdSe BHJ thin films. The deconvolution procedure allows extraction of the polaron populations in the neat polymer and hybrid thin films.

Paper Details

Date Published: 2 January 2015
PDF: 10 pages
J. Photon. Energy. 5(1) 057404 doi: 10.1117/1.JPE.5.057404
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Elsa Couderc, The Univ. of Southern California (United States)
Matthew J. Greaney, The Univ. of Southern California (United States)
William Thornbury, The Univ. of Southern California (United States)
Richard L. Brutchey, The Univ. of Southern California (United States)
Stephen E. Bradforth, The Univ. of Southern California (United States)


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