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Enhancing Thermal Interface Conductance to Graphene Using Ni-Pd Alloy Contacts.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-01 , DOI: 10.1021/acsami.0c06953 Dipanjan Saha 1 , Xiaoxiao Yu 2 , Yanhao Du 3 , Zhitao Guo 2 , Feng Xiong 3 , Andrew J Gellman 2, 4 , Jonathan A Malen 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-01 , DOI: 10.1021/acsami.0c06953 Dipanjan Saha 1 , Xiaoxiao Yu 2 , Yanhao Du 3 , Zhitao Guo 2 , Feng Xiong 3 , Andrew J Gellman 2, 4 , Jonathan A Malen 1
Affiliation
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/m2 K and 113 ± (33, 22) MW/m2 K at ∼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.
中文翻译:
使用Ni-Pd合金触点提高石墨烯的热界面电导率。
为了确定与石墨烯的优良热接触,我们实施了一种高通量方法,该方法系统地探索了Ni-Pd合金的成分谱以及Cr粘附层厚度对单层石墨烯热界面电导的影响。两个独立制备的Ni-Pd / Cr /石墨烯/ SiO 2样品的频域热反射率测量表明,最大金属/石墨烯/ SiO 2结热界面电导为114±(39,25)MW / m 2 K和113±(33 ,22)兆瓦/米2K在〜10 at。Ni中的Pd百分比-几乎是纯金属最高报告值的两倍,是纯Ni或Pd的3倍。任意厚度的Cr都会抑制该最大值。尽管峰的起源尚未解决,但我们发现它与Ni-Pd相图中显示出混溶间隙的区域相关。通过高分辨率透射电子显微镜进行的横截面成像可以确定在此特定成分下合金中的条纹,这与分离成多个相一致。通过这项工作,我们将注意力集中在合金上,以寻求与下一代设备的二维材料更好的接触。
更新日期:2020-07-29
中文翻译:
使用Ni-Pd合金触点提高石墨烯的热界面电导率。
为了确定与石墨烯的优良热接触,我们实施了一种高通量方法,该方法系统地探索了Ni-Pd合金的成分谱以及Cr粘附层厚度对单层石墨烯热界面电导的影响。两个独立制备的Ni-Pd / Cr /石墨烯/ SiO 2样品的频域热反射率测量表明,最大金属/石墨烯/ SiO 2结热界面电导为114±(39,25)MW / m 2 K和113±(33 ,22)兆瓦/米2K在〜10 at。Ni中的Pd百分比-几乎是纯金属最高报告值的两倍,是纯Ni或Pd的3倍。任意厚度的Cr都会抑制该最大值。尽管峰的起源尚未解决,但我们发现它与Ni-Pd相图中显示出混溶间隙的区域相关。通过高分辨率透射电子显微镜进行的横截面成像可以确定在此特定成分下合金中的条纹,这与分离成多个相一致。通过这项工作,我们将注意力集中在合金上,以寻求与下一代设备的二维材料更好的接触。