Special Section on Hybrid Organic-Inorganic Solar Cells

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

[+] Author Affiliations
Elsa Couderc

University of Southern California, Department of Chemistry, Los Angeles, California 90089-0482, United States

Matthew J. Greaney

University of Southern California, Department of Chemistry, Los Angeles, California 90089-0482, United States

William Thornbury

University of Southern California, Department of Chemistry, Los Angeles, California 90089-0482, United States

Richard L. Brutchey

University of Southern California, Department of Chemistry, Los Angeles, California 90089-0482, United States

Stephen E. Bradforth

University of Southern California, Department of Chemistry, Los Angeles, California 90089-0482, United States

J. Photon. Energy. 5(1), 057404 (Jan 02, 2015). doi:10.1117/1.JPE.5.057404
History: Received October 7, 2014; Accepted November 19, 2014
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

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", J. Photon. Energy. 5(1), 057404 (Jan 02, 2015). ; http://dx.doi.org/10.1117/1.JPE.5.057404


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