Improvement of ultrathin gate oxide and oxynitride integrity using fluorine implantation technique
- 6 January 1997
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 70 (1) , 37-39
- https://doi.org/10.1063/1.119297
Abstract
The effects of fluorine on ultrathin gate oxide and oxynitride (∼40 Å) have been studied. The incorporation of fluorine was done by fluorine ion implantation into polycrystalline silicon (polysilicon) gate followed by a high-temperature drive-in step. It has been found that the integrity of oxide has been improved with the incorporation of fluorine as demonstrated by the reduction of stress-induced leakage current and interface trap generation. Furthermore, unlike thicker dielectrics (>100 Å) for which the charge-to-breakdown (QBD) values decrease with increasing fluorine concentration, QBD’s remain the same as those of the control samples for the ultrathin thickness regime. The mechanism for oxide quality improvement by F will also be discussed in the letter.Keywords
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