Mechanical and electrical stability of PEDOT: PTS and Au source/drain electrodes for bottom contact OTFTs on plastic films under bending conditions

Title
Mechanical and electrical stability of PEDOT: PTS and Au source/drain electrodes for bottom contact OTFTs on plastic films under bending conditions
Authors
김영호
Keywords
Flexibility; OTFTs; Mechanical stability; PEDOT:PTS electrodes; Adhesion
Issue Date
2015-07
Publisher
ELSEVIER SCIENCE BV
Citation
ORGANIC ELECTRONICS, v. 26, Page. 8-14
Abstract
Two types of source/drain (S/D) electrodes, formed of poly(3,4-ethylenedioxythiophene): p-toluenesulfonate (PEDOT:PTS) conducting polymer and Au, were fabricated and mounted on flexible pentacene transistors. Several properties of the S/D electrodes were investigated: the adhesion between electrode and pentacene, the failure induced by mechanical bending, the electrical properties including contact resistance, and the field-effect mobility. The measurement of adhesive force using a 90 degrees peel tester revealed that the adhesive force of the pentacene-PEDOT:PTS interface was 200 N/m, while that of Au-pentacene was too small to be measured. The poor adhesion between the Au and pentacene led to the local delamination of the Au film, starting at a strain of approximately 1% and with a rapid increase of delamination density with increasing strain. The strain-induced mechanical damage has a direct effect on contact resistance, which in turn degrades mobility. In contrast, no delamination is observed with the high adhesive force at the pentacene-PEDOT: PTS interface, which thus led to a slight increase of contact resistance and mobility with strain. Consequently, the pentacene-PEDOT: PTS contacts provide mechanical and electrical stability in flexible organic thin film transistors (OTFTs) under bending tests. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S1566119915300379http://hdl.handle.net/20.500.11754/26199
ISSN
1566-1199; 1878-5530
DOI
http://dx.doi.org/10.1016/j.orgel.2015.07.016
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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