Enhanced Adhesion of Copper Films on Fused Silica Glass Substrate by Plasma Pre-Treatment
文献类型： 外文期刊
作者： Yang, Liqing 1 ; Yang, Xianli 2 ; Gao, Fei 1 ; Guan, Yongmao 1 ; Wan, Rui 1 ; Wang, Pengfei 1 ;
作者机构： 1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China
2.Shanghai Acad Agr Sci, Inst Agrofood Stand & Testing Technol, Shanghai 200062, Peoples R China
关键词： copper films; plasma pre-treatment; adhesion; diffusion junction layer
期刊名称：MATERIALS （ 影响因子：3.4； 五年影响因子：3.8 ）
ISSN：
年卷期： 2023 年 16 卷 14 期
页码：
收录情况： SCI
摘要： A non-thermal atmospheric jet plasma pre-treatment technique was introduced to help the growth of extremely sticky copper films on fused silica glass substrates. A tape test was utilized to assess the bonding quality between copper films and fused silica glass substrates. AFM was used to characterize the sample surface roughness and XPS for chemical bonding characterization. The Owens-Wendt method and a Theta Lite Optical Tensiometer were used to analyze the contact angle and surface energy. The results showed that the surface energy greatly increased from 34.6 & PLUSMN; 0.3 mJ & BULL;m(-2) to 55.9 & PLUSMN; 0.4 mJ & BULL;m(-2) after 25 s plasma pre-treatment due to the increasing Si-O and Si-N concentrations, which brought about the electrostatic force increasing at the copper/glass interface. After 25 s plasma pre-treatment, the average surface roughness (Sa) grew from 0.8 & PLUSMN; 0.1 nm to 2.4 & PLUSMN; 0.3 nm. With higher surface roughness, there were more spaces and vacancies for the copper atoms to make contact on the bonded surfaces and increase the mechanical bite force. The electrostatic force and the mechanical bite force on the interface helped to form an atomic diffusion connection layer and improved the interactions between the copper film and the glass substrate. The findings in the SEM supported the conclusions stated above. Therefore, the adhesion between copper films and fused silica glass substrates increased by about 20% by 25 s plasma pre-treatment compared with the untreated glass substrate.
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