Molybdenum gate technology for ultrathin-body MOSFETs and FinFETs

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Damage-free sputter deposition and highly selective dry-etch processes have been developed for molybdenum (Mo) metal gate technology, for application to fully depleted silicon-on-insulator ( devices such as the ultrathin body (UTB) MOSFET and double-gate FinFET. A plasma charge trap effectively eliminates high-energy particle bombardment during Mo sputtering; hence the gate-dielectric integrity (TDDB, Q(BD)) is significantly improved and the field-effect mobility in Mo-gated MOSFETs follows the universal mobility curve. The effects of etch process parameters such as chlorine (Cl-2) and oxygen (O-2) gas flow rate, and source and bias radio frequence powers, were investigated in order to optimize the Mo etch rate and selectivity to SiO2. A highly selective etch process was successfully applied to pattern Mo gate electrodes for UTB MOSFETs and FinFETs without leaving any residue or stringers. Measured electrical characteristics and physical analysis results are discussed.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2004-12
Language
English
Article Type
Article
Keywords

SI MOSFETS; METAL; DEPOSITION; NITRIDE

Citation

IEEE TRANSACTIONS ON ELECTRON DEVICES, v.51, no.12, pp.1989 - 1996

ISSN
0018-9383
DOI
10.1109/TED.2004.839752
URI
http://hdl.handle.net/10203/685
Appears in Collection
EE-Journal Papers(저널논문)
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