Low-hole concentration polycrystalline germanium by CO2 laser annealing for the fabrication of an enhancement-mode nMOSFET

Hari Anand Kasirajan, Wen Hsien Huang, Ming Hsuan Kao, Hsing Hsiang Wang, Jia Min Shieh, Fu-Ming Pan, Chang Hong Shen

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10 Scopus citations

Abstract

A p-type polycrystalline Ge (poly-Ge) film processed by UV and CO2 laser annealing reduces the hole concentration from 6 × 1018 to 2 × 1016 cm-3, accompanied by poly-grain growth. The decrease in hole concentration arises from the defect annealing using a CO2 laser, as demonstrated by the changes in the work function, that is, the valence-band maximum (VBM). The laser processes reduce the thermal budget for the fabrication of an enhancement-mode poly-Ge nMOSFET, which has a I on/I off ratio of 5 × 103, a V th of 2 V, and a subthreshold swing of 250 mV/dec., and will be potential fabrication methods for monolithic 3D integrated circuits in the future.

Original languageEnglish
Article number101305
JournalApplied Physics Express
Volume11
Issue number10
DOIs
StatePublished - 1 Oct 2018

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