期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 30, 页码 34317-34322出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06953
关键词
2D materials; thermoreflectance; alloy thin films; miscibility gap; TEM images
资金
- National Science Foundation [ENG ECCS 1901972]
- Army Research Office [W911NF-17-1-0397]
- NSF [ENG ECCS 1901864]
- MCSI Seed Fund from University of Pittsburgh
- [NSF-CHE1566228]
To identify superior thermal contacts to graphene, we implement a high-throughput methodology that systematically explores the Ni-Pd alloy composition spectrum and the effect of Cr adhesion layer thickness on thermal interface conductance with monolayer graphene. Frequency domain thermoreflectance measurements of two independently prepared Ni-Pd/Cr/graphene/SiO2 samples identify a maximum metal/graphene/SiO2 junction thermal interface conductance of 114 +/- (39, 25) MW/m(2) K and 113 +/- (33, 22) MW/m(2) K at similar to 10 at. % Pd in Ni-nearly double the highest reported value for pure metals and 3 times that of pure Ni or Pd. The presence of Cr, at any thickness, suppresses this maximum. Although the origin of the peak is unresolved, we find that it correlates with a region of the Ni-Pd phase diagram that exhibits a miscibility gap. Cross-sectional imaging by high-resolution transmission electron microscopy identifies striations in the alloy at this particular composition, consistent with separation into multiple phases. Through this work, we draw attention to alloys in the search for better contacts to two-dimensional materials for next-generation devices.
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