Journal
NANO LETTERS
Volume 14, Issue 2, Pages 626-633Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4038399
Keywords
Field effect transistor; Hall effect; Hall cross; multigate FET; III-V; nanowire FET CMOS; scattering; electrical transport; diffusive transport; ballistic transport
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Funding
- National Science Foundation
- SAMSUNG GRO project at Penn State University
- SRC
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The III-V semiconductors such as InxGa1-xAs (x = 0.53-0.70) have attracted significant interest in the context of low power digital complementary metal-oxide-semiconductor (CMOS) technology due to their superior transport properties. However, top-down patterning of III-V semiconductor thin films into strongly confined quasi-one-dimensional (ID) nanowire geometries can potentially degrade the transport properties. To date, few reports exist regarding transport measurement in multigate nanowire structures. In this work, we report a novel methodology for characterizing electron transport in III-V multigate nanowire field effect transistors (NWFETs). We demonstrate multigate NWFETs integrated with probe electrodes in Hall Bridge geometry to enable four-point measurements of both longitudinal and transverse resistance. This allows for the first time accurate extraction of Hall mobility and its dependence on carrier concentration in III-V NWFETs. Furthermore, it is shown that by implementing parallel arrays of nanowircs, it is possible to enhance the signal-to-noise ratio of the measurement, enabling more reliable measurement of Hall voltage (carrier concentration) and, hence, mobility. We characterize the mobility for various nanowire widths down to 40 nm and observe a monotonic reduction in mobility compared to planar devices. Despite this reduction, III-V NWFET mobility is shown to outperform state-of-the-art strained silicon NWFETs. Finally, we demonstrate evidence of room -temperature ballistic transport, a desirable property in the context of short channel transistors, in strongly confined III-V nanowire junctions using magnetotransport measurements in a nanoscale Hall-cross structure.
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