Chiroptical-Conjugated Polymer/Chiral Small Molecule Hybrid Thin Films for Circularly Polarized Light-Detecting Heterojunction Devices

Title
Chiroptical-Conjugated Polymer/Chiral Small Molecule Hybrid Thin Films for Circularly Polarized Light-Detecting Heterojunction Devices
Authors
임정아황도경한혜미김수진안종태김나연김지훈장호원주병권
Keywords
circularly polarized light; 1,1'-binaphthyl; polythiophene; heterojunction bilayer structure; photodiode
Issue Date
2019-03
Publisher
Advanced functional materials
Citation
VOL 29, NO 11-1808668-10
Abstract
Herein, a simple and facile strategy is described to obtain chiroptically active semiconductor thin films by blending of poly(3-alkylthiophene)s, which are conventional achiral polymer semiconductors, and 1,1′-binaphthyl (BN), a versatile chiral molecule. As expected, the intermolecular interaction between the two materials is important to extend the chirality of the binaphthyl molecules to the hybrid films. The controlled phase separation and crystallization of poly[3-(6-carboxyhexyl)thiophene-2,5-diyl] (P3CT) and binaphthyl hybrid films result in unique heterojunction bilayer thin-film structures that consisted of BN microcrystals at the top and a P3CT/BN mixed layer at the bottom. Such heterojunction bilayer films exhibit significantly amplified chiroptical response with weak broadened tails, which is due to the enhanced crystallization of the chiral BN molecules and formation of heteroaggregates in the hybrid films. Based on the characterization of crystalline structure and photoluminescence analysis, it is found that new electronic energy states are formed in the conduction band region of P3CTs in the P3CT/BN heteroaggregates, which contribute to chirality transfer from BN to the hybrid films. As a proof of concept, a photodiode capable of distinguishably sensing the leftand right-handed circularly polarized light is successfully fabricated by using the hybrid films with the heterojunction bilayer structure.
URI
http://pubs.kist.re.kr/handle/201004/69173
ISSN
1616-301X
Appears in Collections:
KIST Publication > Article
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