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

Na Yeon Kim, Jihoon Kyhm, Hyemi Han, Soo Jin Kim, Jongtae Ahn, Do Kyung Hwang, Ho Won Jang, Byeong Kwon Ju, Jung Ah Lim

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 left- and right-handed circularly polarized light is successfully fabricated by using the hybrid films with the heterojunction bilayer structure.

Original languageEnglish
Article number1808668
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 2019 Jan 1

Keywords

  • 1,1′-binaphthyl
  • circularly polarized light
  • heterojunction bilayer structure
  • photodiode
  • polythiophene

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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