Channel Length-Dependent Operation of Ambipolar Schottky-Barrier Transistors on a Single Si Nanowire

Title
Channel Length-Dependent Operation of Ambipolar Schottky-Barrier Transistors on a Single Si Nanowire
Authors
전대영So Jeong ParkVioletta SessiJens TrommerAndre HeinzigThomas MikolajickGyu-Tae KimWalter M. Weber
Keywords
Si nanowire; effective Schottky barrier height; Schottky barrier; ambipolar transistors; channel length scaling; current?voltage contour map
Issue Date
2020-09
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 12, NO 39-43932
Abstract
For use in flexible, printable, wearable electronics, Schottky-barrier field-effect transistors (SB-FETs) with various channel materials including low-dimensional nanomaterials have been considered so far due to their comparatively simple and cost-effective integration scheme free of junction and channel dopants. However, the electric conduction mechanism and the scaling properties underlying their performance differ significantly from those of conventional metal– oxide– semiconductor (MOS) field-effect transistors. Indeed, an understanding of channel length scaling and drain bias impact has not been elucidated sufficiently. Here, multiple ambipolar SB-FETs with different channel lengths have been fabricated on a single silicon nanowire ensuring a constant nanowire diameter. Their length scaling behavior is analyzed through drain current and transconductance contour maps, each depending on the drain and gate bias. The reduced gate control and extended drain field effect on Schottky junctions were observed in short channels. Activation energy measurements showed lower sensitive behavior of the Schottky barrier to gate bias in the short-channel device and confirmed the thinning of Schottky barrier width for electrons at the source interface with drain bias.
URI
http://pubs.kist.re.kr/handle/201004/71904
ISSN
1944-8244
Appears in Collections:
KIST Publication > Article
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