TY - JOUR
T1 - Mechanical reliability of self-similar serpentine interconnect for fracture-free stretchable electronic devices
AU - Qaiser, Nadeem
AU - Damdam, Asrar Nabil
AU - Khan, Sherjeel M.
AU - Elatab, Nazek
AU - Hussain, Muhammad Mustafa
N1 - KAUST Repository Item: Exported on 2021-07-08
Acknowledged KAUST grant number(s): REP/1/2707-01-01, REP/1/2880-01-01
Acknowledgements: This publication is based on the work supported by King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award Nos. REP/1/2707-01-01 and REP/1/2880-01-01. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
PY - 2021/7/7
Y1 - 2021/7/7
N2 - Currently, silicon (Si)-based island–interconnect structures are emerging in next-generation stretchable electronic devices such as flexible medical implants, soft robotics, and wearables. Various geometrical designs are being used as interconnects for promising stretchable electronic systems. Among them, self-similar serpentine interconnects (SS-interconnects) are widely used due to their high areal efficiency and stretchability. However, to date, pertinent devices choose random parameters of SS-interconnects since the detailed design guidelines are still elusive. Additionally, no study has revealed how the lateral size or width affects the stretchability during in-plane and out-of-plane stretching. Here, we show how the mechanics could help get the optimized Si-based SS-interconnect without losing its areal efficiency. Our numerical and experimental results show that thin interconnects attain 70%–80% higher stretchability than thicker counterparts. The numerical and experimental results match well. Numerical results indicate the areas prone to break earlier, followed by experimental validation. We devise how induced stress could predict the fracture conditions for any given size and shape of an interconnect. Our results demonstrate that the larger width plays a crucial role in out-of-plane stretching or rotation, i.e., the stress values are 60% higher for the larger width of SS-interconnect during rotation (up to 90°). Our calculations reveal the fracture-free zone for SS-interconnects, showing the figure-of-merit. We demonstrate the detailed guidelines that could help choose the right parameters for fracture-free SS-interconnects for required stretchability, devising the next-generation stretchable and wearable electronic devices.
AB - Currently, silicon (Si)-based island–interconnect structures are emerging in next-generation stretchable electronic devices such as flexible medical implants, soft robotics, and wearables. Various geometrical designs are being used as interconnects for promising stretchable electronic systems. Among them, self-similar serpentine interconnects (SS-interconnects) are widely used due to their high areal efficiency and stretchability. However, to date, pertinent devices choose random parameters of SS-interconnects since the detailed design guidelines are still elusive. Additionally, no study has revealed how the lateral size or width affects the stretchability during in-plane and out-of-plane stretching. Here, we show how the mechanics could help get the optimized Si-based SS-interconnect without losing its areal efficiency. Our numerical and experimental results show that thin interconnects attain 70%–80% higher stretchability than thicker counterparts. The numerical and experimental results match well. Numerical results indicate the areas prone to break earlier, followed by experimental validation. We devise how induced stress could predict the fracture conditions for any given size and shape of an interconnect. Our results demonstrate that the larger width plays a crucial role in out-of-plane stretching or rotation, i.e., the stress values are 60% higher for the larger width of SS-interconnect during rotation (up to 90°). Our calculations reveal the fracture-free zone for SS-interconnects, showing the figure-of-merit. We demonstrate the detailed guidelines that could help choose the right parameters for fracture-free SS-interconnects for required stretchability, devising the next-generation stretchable and wearable electronic devices.
UR - http://hdl.handle.net/10754/670038
UR - https://aip.scitation.org/doi/10.1063/5.0048477
U2 - 10.1063/5.0048477
DO - 10.1063/5.0048477
M3 - Article
SN - 0021-8979
VL - 130
SP - 014902
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 1
ER -