Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1786
Title: Organic donor-acceptor assemblies form coaxial p-n heterojunctions with high photoconductivity
Authors: Prasanthkumar, S
Ghosh, S
Vijayakumar C Nair
Saeki, A
Seki, S
Ajayaghosh, A
Keywords: Photoconductivity
p-n heterojunctions
Donor-acceptor systems
Issue Date: 2015
Publisher: Wiley
Citation: Angewandte Chemie International Edition 54(3):946-950;12 Jan 2015
Abstract: The formation of coaxial p-n heterojunctions by mesoscale alignment of self-sorted donor and acceptor molecules, important to achieve high photocurrent generation in organic semiconductor-based assemblies, remains a challenging topic. Herein, we show that mixing a p-type pi gelator (TTV) with an n-type semiconductor (PBI) results in the formation of self-sorted fibers which are coaxially aligned to form interfacial p-n heterojunctions. UV/Vis absorption spectroscopy, powder X-ray diffraction studies, atomic force microscopy, and Kelvin-probe force microscopy revealed an initial self-sorting at the molecular level and a subsequent mesoscale self-assembly of the resulted supramolecular fibers leading to coaxially aligned p-n heterojunctions. A flash photolysis time-resolved microwave conductivity (FP-TRMC) study revealed a 12-fold enhancement in the anisotropic photoconductivity of TTV/PBI coaxial fibers when compared to the individual assemblies of the donor/acceptor molecules.
ISSN: 1521-3773
Appears in Collections:2015

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