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Title: Concentration and excitation effects on the exciton dynamics of poly(3-hexylthiophene)/PbS quantum dot blend films
Authors: Tsokkou, Demetra 
Itskos, Grigorios 
Choulis, Stelios A. 
Yarema, Maksym 
Heiss, Wolfgang 
Othonos, Andreas 
Keywords: Heterojunction solar-cells;Colloidal pbS nanocrystals;Organic photodiodes;Charge-separation;Electron-transfer;Polymer;Fullerene;Spectroscopy;P3HT/PCBM
Category: Nano-Technology
Field: Engineering and Technology
Issue Date: 14-Jun-2013
Publisher: IOP Publishing Ltd.
Source: Nanotechnology, 2013, Volume 24, Issue 23, Article number 235707
DOI: 10.1088/0957-4484/24/23/235707
Abstract: The dynamics of photoexcitations in hybrid blends of poly(3-hexylthiophene) (P3HT) conjugated polymer donor and oleic-acid capped lead sulfide (PbS) quantum dot (QD) acceptors of different concentrations - for light harvesting applications - were investigated using time-resolved transmission and photoluminescence spectroscopies. Following excitation at 400 nm and probing in the 500-1000 nm region, we find that geminate excitation recombination in the blend of P3HT/PbS QDs dominates the transient decays at sub-ns times while intermaterial interactions such as charge transfer processes appear at longer times in the 1-50 ns regime. For the hybrid blend films with lower QD concentrations (<67% wt), polymer exciton recombination dominates the overall transient absorption signal. For higher QD contents, QD state relaxation effects become visible. Excitation density studies reveal the presence of linear exciton relaxation effects in the P3HT region while carrier decay for films with high PbS QD concentration is influenced by QD Auger recombination. Time-resolved luminescence shows that electron transfer from the P3HT/PbS QDs appears relatively inefficient in comparison to the geminate recombination, while hole transfer competes favorably to intrinsic QD recombination.
ISSN: 09574484
Rights: © 2013 IOP Publishing Ltd.
Type: Article
Appears in Collections:Άρθρα/Articles

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