TY - JOUR
T1 - Tunable metal contacts at layered black-arsenic/metal interface forming during metal deposition for device fabrication
AU - Kundu, Subhajit
AU - Golani, Prafful
AU - Yun, Hwanhui
AU - Guo, Silu
AU - Youssef, Khaled M.
AU - Koester, Steven J.
AU - Mkhoyan, K. Andre
N1 - Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - Understanding the kinetics of interfacial reaction in the deposition of metal contacts on 2D materials is important for determining the level of contact tenability and the nature of the contact itself. Here, we find that some metals, when deposited onto layered black-arsenic films using e-beam evaporation, form a-few-nm thick distinct intermetallic layer and significantly change the nature of the metal contact. In the case of nickel, the intermetallic layer is Ni11As8, whereas in the cases of chromium and titanium they are CrAs and a-Ti3As, respectively, with their unique structural and electronic properties. We also find that temperature, which affects interatomic diffusion and interfacial reaction kinetics, can be used to control the thickness and crystallinity of the interfacial layer. In the field effect transistors with black-arsenic channel, due to the specifics of its formation, this interfacial layer introduces a second and more efficient edge-type charge transfer pathway from the metal into the black-arsenic. Such tunable interfacial metal contacts could provide new pathways for engineering highly efficient devices and device architectures.
AB - Understanding the kinetics of interfacial reaction in the deposition of metal contacts on 2D materials is important for determining the level of contact tenability and the nature of the contact itself. Here, we find that some metals, when deposited onto layered black-arsenic films using e-beam evaporation, form a-few-nm thick distinct intermetallic layer and significantly change the nature of the metal contact. In the case of nickel, the intermetallic layer is Ni11As8, whereas in the cases of chromium and titanium they are CrAs and a-Ti3As, respectively, with their unique structural and electronic properties. We also find that temperature, which affects interatomic diffusion and interfacial reaction kinetics, can be used to control the thickness and crystallinity of the interfacial layer. In the field effect transistors with black-arsenic channel, due to the specifics of its formation, this interfacial layer introduces a second and more efficient edge-type charge transfer pathway from the metal into the black-arsenic. Such tunable interfacial metal contacts could provide new pathways for engineering highly efficient devices and device architectures.
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U2 - 10.1038/s43246-022-00233-7
DO - 10.1038/s43246-022-00233-7
M3 - Article
AN - SCOPUS:85126166405
SN - 2662-4443
VL - 3
JO - Communications Materials
JF - Communications Materials
IS - 1
M1 - 11
ER -