skip to main content

SciTech ConnectSciTech Connect

Title: High performance organic field-effect transistors with ultra-thin HfO{sub 2} gate insulator deposited directly onto the organic semiconductor

We have produced stable organic field-effect transistors (OFETs) with an ultra-thin HfO{sub 2} gate insulator deposited directly on top of rubrene single crystals by atomic layer deposition (ALD). We find that ALD is a gentle deposition process to grow thin films without damaging rubrene single crystals, as results these devices have a negligibly small threshold voltage and are very stable against gate-bias-stress, and the mobility exceeds 1 cm{sup 2}/V s. Moreover, the devices show very little degradation even when kept in air for more than 2 months. These results demonstrate thin HfO{sub 2} layers deposited by ALD to be well suited as high capacitance gate dielectrics in OFETs operating at small gate voltage. In addition, the dielectric layer acts as an effective passivation layer to protect the organic semiconductor.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ; ;  [3] ;  [5]
  1. Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511 (Japan)
  2. (Switzerland)
  3. Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)
  4. (Japan)
  5. Laboratory for Solid State Physics, ETH Zurich, Zurich 8093 (Switzerland)
Publication Date:
OSTI Identifier:
22257115
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIELECTRIC MATERIALS; FIELD EFFECT TRANSISTORS; HAFNIUM OXIDES; MONOCRYSTALS; ORGANIC SEMICONDUCTORS; THIN FILMS