Improvement of interface properties in SiC(0001) MOS structures by plasma nitridation of SiC surface followed by SiO2 deposition and CO2 annealing
Applied Physics Express(2023)
摘要
Abstract Although nitridation passivates defects at the SiO 2 /SiC interface, avoiding the introduction of nitrogen atoms into SiO 2 is crucial for reliability. This paper presents a method to selectively introduce nitrogen at the SiC-side of the interface. The method comprises the following steps: (i) plasma nitridation of the SiC surface, (ii) sputter deposition of SiO 2 , and (iii) annealing in a CO 2 ambient. Significantly low D it values of about 1 × 10 11 cm −2 eV −1 were obtained near the conduction band edge of SiC. Furthermore, the resulting interface properties were hardly degraded by excimer ultraviolet light irradiation, indicating better stability compared with a NO-nitrided sample.
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关键词
sic0001 surface,mos structures,plasma nitridation,interface properties
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