Improving mechanical fatigue resistance by optimizing the nanoporous structure of inkjet-printed Ag electrodes for flexible devices

Title
Improving mechanical fatigue resistance by optimizing the nanoporous structure of inkjet-printed Ag electrodes for flexible devices
Authors
Byoung-Joon KimThomas HaasAndreas FriederichJi-Hoon LeeDae-Hyung NamJoachim R BinderWerner Bauer최인석Young-Chang JooPatric A GruberOliver Kraft
Keywords
inkjet printing; fatigue lifetime; flexible electrode; nanoporous
Issue Date
2014-03
Publisher
Nanotechnology
Citation
VOL 25, NO 12, 125706-1-125706-6
Abstract
The development of highly conductive metallic electrodes with long-term reliability is in great demand for real industrialization of flexible electronics, which undergo repeated mechanical deformation during service. In the case of vacuum-deposited metallic electrodes, adequate conductivity is provided, but it degrades gradually during cyclic mechanical deformation. Here, we demonstrate a long-term reliable Ag electrode by inkjet printing. The electrical conductivity and the mechanical reliability during cyclic bending are investigated with respect to the nanoporous microstructure caused by post heat treatment, and are compared to those of evaporated Ag films of the same thickness. It is shown that there is an optimized nanoporous microstructure for inkjet-printed Ag films, which provides a high conductivity and improved reliability. It is argued that the nanoporous microstructure ensures connectivity within the particle network and at the same time reduces plastic deformation and the formation of fatigue damage. This concept provides a new guideline to develop an efficient method for highly conductive and reliable metallic electrodes for flexible electronics.
URI
http://pubs.kist.re.kr/handle/201004/48324
ISSN
09574484
Appears in Collections:
KIST Publication > Article
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