Deconvoluting contributions of photoexcited species in polymer-quantum dot hybrid photovoltaic materials

Elsa Couderc; Matthew J. Greaney; William Thornbury; Richard L. Brutchey; Stephen E. Bradforth

doi:10.1117/1.JPE.5.057404

2 January 2015 Deconvoluting contributions of photoexcited species in polymer-quantum dot hybrid photovoltaic materials

Elsa Couderc, Matthew J. Greaney, William Thornbury, Richard L. Brutchey, Stephen E. Bradforth

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Funded by: National Science Foundation

Journal of Photonics for Energy, Vol. 5, Issue 1, 057404 (January 2015). https://doi.org/10.1117/1.JPE.5.057404

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.

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Elsa Couderc, Matthew J. Greaney, William Thornbury, Richard L. Brutchey, and Stephen E. Bradforth "Deconvoluting contributions of photoexcited species in polymer-quantum dot hybrid photovoltaic materials," Journal of Photonics for Energy 5(1), 057404 (2 January 2015). https://doi.org/10.1117/1.JPE.5.057404

Published: 2 January 2015

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