2016/05/27 by Dingxun Fan, Ning Kang, N Kang +5
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Contact resistance #Electrical engineering #Field-effect transistor #Layer (electronics) #Materials science #Metal–semiconductor junction #Nanotechnology #Nanowire #Nanowire Synthesis and Applications #Optoelectronics #Schottky barrier #Semiconductor Quantum Structures and Devices #Transistor #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1088/0957-4484/27/27/275204
published as Nanotechnology 27, 275204 (2016) · 12 pages, 4 figures
arxiv created 2016/05/27 · openalex publication_date 2016/05/27 · arxiv updated 2016/05/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Understanding of the electrical contact properties of semiconductor nanowire (NW) field-effect transistors (FETs) plays a crucial role in the use of semiconducting NWs as building blocks for future nanoelectronic devices and in the study of fundamental physics problems. Here, we report on a study of the contact properties of Ti/Au, a widely used contact metal combination, when contacting individual InSb NWs via both two-probe and four-probe transport measurements. We show that a Schottky barrier of height [Formula: see text] is present at the metal-InSb NW interfaces and its effective height is gate-tunable. The contact resistance ([Formula: see text]) in the InSb NWFETs is also analyzed by magnetotransport measurements at low temperatures. It is found that [Formula: see text] in the on-state exhibits a pronounced magnetic field-dependent feature, namely it is increased strongly with increasing magnetic field after an onset field [Formula: see text]. A qualitative picture that takes into account magnetic depopulation of subbands in the NWs is provided to explain the observation. Our results provide solid experimental evidence for the presence of a Schottky barrier at Ti/Au-InSb NW interfaces and can be used as a basis for design and fabrication of novel InSb NW-based nanoelectronic devices and quantum devices.