Colloidal nanoplatelet/conducting polymer hybrids: excitonic and material properties
Author(s)
Date
2016Source Title
Journal of Physical Chemistry C
Print ISSN
1932-7447
Publisher
American Chemical Society
Volume
120
Issue
6
Pages
3573 - 3582
Language
English
Type
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Abstract
Here we present the first account of conductive polymer/colloidal nanoplatelet hybrids. For this, we developed DEH-PPV-based polymers with two different anchor groups (sulfide and amine) acting as surfactants for CdSe nanoplatelets, which are atomically flat semiconductor nanocrystals. Hybridization of the polymers with the nanoplatelets in the solution phase was observed to cause strong photoluminescence quenching in both materials. Through steady-state photoluminescence and excitation spectrum measurements, photoluminescence quenching was shown to result from dominant exciton dissociation through charge transfer at the polymer/nanoplatelet interfaces that possess a staggered (i.e., type II) band alignment. Importantly, we found out that sulfide-based anchors enable a stronger emission quenching than amine-based ones, suggesting that the sulfide anchors exhibit more efficient binding to the nanoplatelet surfaces. Also, shorter surfactants were found to be more effective for exciton dissociation as compared to the longer ones. In addition, we show that nanoplatelets are homogeneously distributed in the hybrid films owing to the functional polymers. These nanocomposites can be used as building blocks for hybrid optoelectronic devices, such as solar cells.
Keywords
AnchorsCharge transfer
Dissociation
Excited states
Excitons
Interface states
Optoelectronic devices
Photoluminescence
Quenching
Surface active agents
Building blockes
Conductive polymer
Emission quenching
Excitation spectrum
Exciton dissociation
Hybrid optoelectronic devices
Photoluminescence quenching
Semiconductor nanocrystals
Sulfur compounds