Publication Informations

Title
Concentration and excitation effects on the exciton dynamics of poly(3-hexylthiophene)/PbS quantum dot blend films
Authors: D Tsokkou; G Itskos; S Choulis; M Yarema; W Heiss; A Othonos
Year: 2013
Research Area: Ultrafast Spectroscopy
Type of Publication: Article
Journal Details
Journal: Nanotechnology
Volume: 24
Number: 23
Pages: 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 (
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