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VACUUM ›› 2022, Vol. 59 ›› Issue (3): 41-45.doi: 10.13385/j.cnki.vacuum.2022.03.09

• Thin Film • Previous Articles     Next Articles

Modification of Tungsten Crucible for Electron Beam Evaporation of Silver Film

FU Xue-cheng, WU Li-ying, LUAN Zhen-xing, MAO Hai-ping, WANG Ying   

  1. Advanced Electronics Materials and Devices, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2021-09-10 Online:2022-05-25 Published:2022-06-01

Abstract: When using tungsten crucible and electron beam evaporation equipment to evaporate silver thin film, silver is infiltrated with tungsten crucible in the molten state,and the liquid level of molten metal in the crucible is concave. Such concave evaporation sources often lead to poor uniformity of the as-deposited films. According to the principle that the microstructure of the object surface will change the contact angle between liquid and solid, a groove array is fabricated on the smooth inner wall of tungsten crucible by chemical corrosion. By changing the contact angle between the molten metal material and the inner wall of the tungsten crucible, the wettability of liquid silver and the wall of tungsten crucible can be adjusted. The results show that when the groove width is about 1mm,the depth is about 0.5mm and the period is about 2mm, the inner wall of the molten silver and tungsten crucible becomes no longer infiltrated. 100nm-thick silver film is evaporated with unmodified and modified tungsten crucible, respectively, and it is found that the uniformity of the evaporated film can be improved effectively by using the modified tungsten crucible.

Key words: electron beam evaporation, tungsten crucible, silver film, microstructure, uniformity

CLC Number: 

  • TB43
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