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나노 구조 물리 연구단
나노구조물리 연구단
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Nanoscale photovoltaic characteristics of single quantum dot hybridized with poly(3-hexylthiophene)

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Title
Nanoscale photovoltaic characteristics of single quantum dot hybridized with poly(3-hexylthiophene)
Author(s)
Han, YD; Jeon, S; Kim, SD; Ji-Hee Kim; Kim, SY; Jeongyong Kim; Lee, KS; Joo, J
Publication Date
2014-11
Journal
ORGANIC ELECTRONICS, v.15, no.11, pp.2893 - 2902
Publisher
ELSEVIER SCIENCE BV
Abstract
Hybrids consisting of CdSe/ZnS quantum dot (QD) as a core and thiol-group functionalized poly(3-hexylthiophene) (P3HT) as a shell were fabricated using the ligand-exchange method. We clearly observed the photovoltaic characteristics of a single QD-P3HT hybrid by using conducting atomic force microscopy. Monochromatic power conversion efficiency drastically increased with an increase in the molecular weight (Mw) of P3HT, suggesting sufficient photoinduced charge transfer between the QD and highly ordered P3HT chains. The nanoscale photoluminescence (PL) intensity for a single QD considerably decreased with increasing Mw of P3HT owing to charge transfer effects. On the basis of time-resolved PL and transient absorption spectra measurements of the QD-P3HT hybrids, we deduced that the exciton lifetimes of the QD were reduced with higher-Mw P3HT hybrids, and photobleaching was observed. The measured nanoscale optical characteristics of the single QD-P3HT hybrids support their distinct photovoltaic behaviors.
URI
https://pr.ibs.re.kr/handle/8788114/869
ISSN
1566-1199
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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