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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Hole Transfer Promoted by a Viscosity Additive in an All-Polymer Photovoltaic Blend

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Title
Hole Transfer Promoted by a Viscosity Additive in an All-Polymer Photovoltaic Blend
Author
Xu, JianqiuWang, RuiChen, ShanshanZhang, ChunfengLiu, LinHuang, FengzhenLu, XiaomeiYang, ChangdukWang, XiaoyongXiao, Min
Issue Date
2020-02
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.11, no.4, pp.1384 - 1389
Abstract
Viscosity modifiers are widely applied to improve the mechanical compliance of organic optoelectronic devices. However, the effect of the viscosity additives on the charge dynamics remains poorly understood. Here, we report the observation of markedly different effects of a high-viscosity polymeric additive on the electron- and hole-transfer dynamics in all-polymer organic photovoltaic blends. By using ultrafast transient absorption spectroscopy, we determine that hole transfer from charge-transfer excitations in the acceptor is markedly promoted while the electron transfer from local excitations in the donor remains nearly unchanged upon introduction of viscosity additives into the blends. We argue that the modification of dielectric screening is the mechanism underlying the effect of the additive on the charge dynamics. This finding suggests a new strategy for designing high-performance flexible organic photovoltaic devices by manipulating the dielectric environment.
URI
https://scholarworks.unist.ac.kr/handle/201301/31658
URL
https://pubs.acs.org/doi/abs/10.1021/acs.jpclett.0c00025
DOI
10.1021/acs.jpclett.0c00025
ISSN
1948-7185
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