Open AccessOrganic field-effect transistor with low-cost CuI/Al bilayer electrode
Author(s) -
Guozheng Nie,
Junbiao Peng,
Zhou Ren-Long
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.127304
Subject(s) - materials science , pentacene , bilayer , electrode , optoelectronics , layer (electronics) , organic semiconductor , transistor , field effect transistor , semiconductor , organic field effect transistor , absorption (acoustics) , ultraviolet photoelectron spectroscopy , electron mobility , voltage , nanotechnology , thin film transistor , x ray photoelectron spectroscopy , composite material , chemical engineering , chemistry , electrical engineering , membrane , biochemistry , engineering
An organic field-effect transistor based on pentacene semiconductor with CuI/Al bilayer electrode is investigated. The CuI layer, directly contacting the organic semiconductor layer, serves as the hole-injection layer. The overcoated metal layer is responsible for the reduction in contact barrier. Compared with the device with a single metal (Al, Au) layer used as the source-drain electrode, the device with CuI/Al electrodes considerably improves the hole mobility and the on/off current ratio and greatly reduces the threshold voltage. Results of X-ray photoelectron and ultraviolet/visible absorption studies reveal that the reduction in the contact barrier can be attributed to an electron transfer from pentacene and Al to CuI.