TY - JOUR

T1 - Crack deflecting microstructure for improved electro-mechanical lifetimes of flexible systems

AU - Cordill, Megan J.

AU - Jörg, Tanja

AU - Glushko, Oleksandr

AU - Franz, Robert

AU - Mitterer, Christian

PY - 2019/2/13

Y1 - 2019/2/13

N2 - Polymer supported metal thin films for flexible and stretchable applications need to have exceptional electro-mechanical behavior. Typically, brittle metal films thicker than 300 nm will fail at low strains. It will be demonstrated that with residual stress and microstructural tuning, a 500 nm thick Mo film on polyimide has a high crack onset strain and does not fail electrically after 1000 tensile straining cycles of 1% due to a novel zig–zag microstructure. The zig–zag microstructure imparts a crack deflecting behavior which ensures longer lifetimes. As a consequence, a high crack onset strain does not indicate better behavior under cyclic loading conditions.

AB - Polymer supported metal thin films for flexible and stretchable applications need to have exceptional electro-mechanical behavior. Typically, brittle metal films thicker than 300 nm will fail at low strains. It will be demonstrated that with residual stress and microstructural tuning, a 500 nm thick Mo film on polyimide has a high crack onset strain and does not fail electrically after 1000 tensile straining cycles of 1% due to a novel zig–zag microstructure. The zig–zag microstructure imparts a crack deflecting behavior which ensures longer lifetimes. As a consequence, a high crack onset strain does not indicate better behavior under cyclic loading conditions.

UR - http://www.scopus.com/inward/record.url?scp=85061722640&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2019.02.039

DO - 10.1016/j.matlet.2019.02.039

M3 - Article

VL - 244.2019

SP - 47

EP - 49

JO - Materials letters

JF - Materials letters

SN - 0167-577X

IS - 1 June

ER -