Abstract
The effect of post-deposition H2 annealing (PDHA) on the reduction of a contact resistance by the metal-interlayer-semiconductor (M-I-S) source/drain (S/D) structure of the germanium (Ge) n-channel field-effect transistor (FET) is demonstrated in this letter. The M-I-S structure reduces the contact resistance of the metal/n-type Ge (n-Ge) contact by alleviating the Fermi-level pinning (FLP). In addition, the PDHA induces interlayer doping and interface controlling effects that result in a reduction of the tunneling resistance and the series resistance regarding the interlayer and an alleviation of the FLP, respectively. A specific contact resistivity ( ρc) of 3.4 × 10-4 Ω · cm2 was achieved on a moderately doped n-Ge substrate (1 × 1017 cm -3) , whereby 5900× reduction was exhibited from the Ti/n-Ge structure, and a 10× reduction was achieved from the Ti/Ar plasma-treated TiO2-x/n-Ge structure. The PDHA technique is, therefore, presented as a promising S/D contact technique for the development of the Ge n-channel FET, as it can further lower the contact resistance of the M-I-S structure.
Original language | English |
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Article number | 7460191 |
Pages (from-to) | 709-712 |
Number of pages | 4 |
Journal | IEEE Electron Device Letters |
Volume | 37 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2016 Jun |
Keywords
- Contact resistance
- Fermi-level unpinning
- germanium
- post-deposition hydrogen annealing
- source/drain
- titanium dioxide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering