Microstructural influence on the cyclic electro-mechanical behaviour of ductile films on polymer substrates

THIN SOLID FILMS

卷:644

Article; Proceedings Paper

Cordill, M. J.^1,4  Glushko, O.^1,4  Kleinbichler, A.^1,4  Putz, B.^1,4  Toebbens, D. M.³  Kirchlechner, C.^1,2,4 

[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[3] Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany

[4] Univ Leoben, Dept Mat Phys, Jahnstr 12, A-8700 Leoben, Austria

关键词: Thin films;    Mechanical properties;    Electrical resistivity;    Microstructure;    Fatigue;   

DOI  :  10.1016/j.tsf.2017.06.067

来源: Elsevier

【 摘 要 】

When ductile metal films on compliant polymer substrates are strained in tension catastrophic failure can be suppressed by the substrate, thus allowing for their use in flexible electronics and sensors. However, the charge carrying ductile films must be of an optimum thickness and microstructure for the suppression of cracking to occur. Studies of strained films on polymer substrates tend to have more emphasis on the electrical properties and thickness effects than on the film microstructure or deformation behaviour. To address both the electrical degradation and deformation behaviour of metal films supported by polymer substrates two types of combined electro-mechanical in-situ tests were performed. First, is a combination of in-situ resistance measurements with in-situ confocal scanning laser microscopy imaging of the film surface during cycling. The 4 point probe resistance measurements allow for the examination of the changes in resistance with strain, while the surface imaging permits the visualization of extrusion and crack formation. Second, is the combination of in-situ resistance with in-situ X-ray diffraction measurements of the film stresses during cycling. The combination of electrical measurements, surface imaging, and stress measurements allow for a complete picture of electromechanical behaviour needed for the improvement and future success of flexible electronic devices.

【 授权许可】

Free