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Sci Rep. 2018 Feb 9;8(1):2763. doi: 10.1038/s41598-018-20368-3.

Flash-induced nanowelding of silver nanowire networks for transparent stretchable electrochromic devices.

Lee C1,2, Oh Y1,2, Yoon IS1,2, Kim SH1, Ju BK3, Hong JM4,5,6.

Author information

1
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
2
Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul, 02841, Republic of Korea.
3
Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul, 02841, Republic of Korea. bkju@korea.ac.kr.
4
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea. jmhong@kist.re.kr.
5
Division of Nano & Information Technology, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea. jmhong@kist.re.kr.
6
Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Republic of Korea. jmhong@kist.re.kr.

Abstract

Electrochromic devices (ECDs) are emerging as a novel technology for various applications like commercialized smart window glasses, and auto-dimming rear-view mirrors. Recently, the development of low-power, lightweight, flexible, and stretchable devices has been accelerated to meet the growing demand in the new wearable devices market. Silver nanowires (AgNWs) can become new primary transparent conducting electrode (TCE) materials to replace indium tin oxide (ITO) for ECDs. However, issues such as substrate adhesion, delamination, and higher resistance still exist with AgNWs. Herein, we report a high-performance stretchable flash-induced AgNW-network-based TCE on surface-treated polydimethylsiloxane (PDMS) substrates. A Xe flash light method was used to create nanowelded networks of AgNWs. Surface silane treatments increased the adhesion and durability of the films as well. Finally, ECDs were fabricated under the optimal conditions and examined under strained conditions to demonstrate the resistance and mechanical behaviours of the devices. Results showed a flexible and durable film maintaining a high level of conductivity and reversible resistance behaviour, beyond those currently achievable with standard ITO/PET flexible TCEs.

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