Effect of morphological and physicochemical properties of dielectric-organic semiconductor interfaces on photoresponse of organic phototransistors

Hea Lim Park, In Ho Lee, Chang Min Keum, Sin Hyung Lee, Sin Doo Lee

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We investigate the effect of the interfacial properties between a polymer dielectric and an organic semiconductor (OS) layers on the photoresponse properties of an organic phototransistor (OPT). Three different polymer materials having different interfacial properties, poly(methyl methacrylate), amorphous fluoropolymer CYTOP, and poly(4-vinylphenol), were used as gate insulators for the OPTs in a bottom-gate top-contact configuration. For the trapping and detrapping processes of minority carriers, the physicochemical nature and the density of functional group of the dielectric material were found to more dominantly govern the photoresponsive properties of the OPT than the morphological effect. Our molecular level description provides a useful guideline to select a proper dielectric material, being used as a gate insulator, for optical applications of the OPTs such as optical memory devices and optical sensors.

Original languageEnglish (US)
Pages (from-to)297-301
Number of pages5
JournalThin Solid Films
Volume619
DOIs
StatePublished - Nov 30 2016

Bibliographical note

Funding Information:
This work was supported in part by Samsung Display Company and the Brain Korea 21 Project in 2016.

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Dielectric/organic semiconductor interface
  • Functional group
  • Morphology
  • Organic phototransistor
  • Polymer dielectric layer
  • Surface energy

Fingerprint

Dive into the research topics of 'Effect of morphological and physicochemical properties of dielectric-organic semiconductor interfaces on photoresponse of organic phototransistors'. Together they form a unique fingerprint.

Cite this