• 文献标题:   Graphene as a Diffusion Barrier in Galinstan-Solid Metal Contacts
  • 文献类型:   Article
  • 作  者:   AHLBERG P, JEONG SH, JIAO MZ, WU ZG, JANSSON U, ZHANG SL, ZHANG ZB
  • 作者关键词:   contact, diffusion barrier, galinstan, graphene
  • 出版物名称:   IEEE TRANSACTIONS ON ELECTRON DEVICES
  • ISSN:   0018-9383 EI 1557-9646
  • 通讯作者地址:   Uppsala Univ
  • 被引频次:   19
  • DOI:   10.1109/TED.2014.2331893
  • 出版年:   2014

▎ 摘  要

This paper presents the use of graphene as a diffusion barrier to a eutectic Ga-In-Sn alloy, i.e., galinstan, for electrical contacts in electronics. Galinstan is known to be incompatible with many conventional metals used for electrical contacts. When galinstan is in direct contact with Al thin films, Al is readily dissolved leading to the formation of Al oxides present on the surface of the galinstan droplets. This reaction is monitored ex situ using several material analysis methods as well as in situ using a simple circuit to follow the time-dependent resistance variation. In the presence of a multilayer graphene diffusion barrier, the Al-galinstan reaction is effectively prevented for galinstan deposited by means of drop casting. When deposited by spray coating, the high-impact momentum of the galinstan droplets causes damage to the multilayer graphene and the Al-galinstan reaction is observed at some defective spots. Nonetheless, the graphene barrier is likely to block the formation of Al oxides at the Al/galinstan interface leading to a stable electrical current in the test circuit.