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Title: Equivalent ambipolar carrier injection of electrons and holes with Au electrodes in air-stable field effect transistors

Carrier injection from Au electrodes to organic thin-film active layers can be greatly improved for both electrons and holes by nano-structural surface control of organic semiconducting thin films using long-chain aliphatic molecules on a SiO{sub 2} gate insulator. In this paper, we demonstrate a stark contrast for a 2,5-bis(4-biphenylyl)bithiophene (BP2T) active semiconducting layer grown on a modified SiO{sub 2} dielectric gate insulator between two different modifications of tetratetracontane and poly(methyl methacrylate) thin films. Important evidence that the field effect transistor (FET) characteristics are independent of electrode metals with different work functions is given by the observation of a conversion of the metal-semiconductor contact from the Schottky limit to the Bardeen limit. An air-stable light emitting FET with an Au electrode is demonstrated.
Authors:
; ;  [1] ; ;  [2] ;  [1] ;  [3]
  1. WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577 (Japan)
  2. Department of Physics, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba, Sendai 980-8578 (Japan)
  3. (Japan)
Publication Date:
OSTI Identifier:
22486392
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; CARRIERS; CONTROL; CONVERSION; DIELECTRIC MATERIALS; ELECTRIC CONTACTS; ELECTRODES; FIELD EFFECT TRANSISTORS; HOLES; LAYERS; METALS; METHACRYLIC ACID ESTERS; MODIFICATIONS; MOLECULES; SILICON OXIDES; SURFACES; THIN FILMS; VISIBLE RADIATION; WORK FUNCTIONS