Reducing Stacking Faults in Highly Doped N-Type 4H-SiC Crystal

Abstract

We investigated a way of reducing the stacking fault (SF) density on a highly nitrogen (N) doped 4H-SiC crystal. SFs were generated at highly N doped crystal exceeding 4 x 1019 cm-3 and the density was increased with increasing N concentration. We found that Al co-doping had the potential to suppress this SF generation and was effective up to an N concentration of about 1 x 1021cm-3. This effect depended strongly on the Al concentration. We discussed the reason for the SF suppression effect of Al co-doping.

Natural products with 1,2-oxazine scaffold: occurrence, chemical diversity, bioactivity, synthesis, and biosynthesis

“…N845-98, was the rst identied terpenoid pyrrolobenzoxazine by Perry and coworkers in 1991, which had a chlorine substitution on the benzene ring and exhibited a broad spectrum of activity against insect pests, free-living nematodes, and parasites. 40 CJ-12662 (40) and CJ-12663 (41), two new terpenoid pyrrolobenzoxazines with additional oxidation and acetylation at the sesquiterpene moiety, were isolated by Kojima and coworkers from the fermentation broth of Aspergillus scheri var. thermomutatus ATCC 18618 in 1995.…”

“…thermomutatus ATCC 18618 in 1995. 41 These two compounds were highly effective against various pests of stored grains and agricultural plants and were also proved to be potent antiparasitic agents for the treatment and prevention of systemic infections caused by endoparasites. 41 In 2004, Didier and coworkers determined the absolute conguration of CJ-12662 (40) by single-crystal X-ray diffraction and further conrmed the structure by a partial synthesis of the 1,2-oxazineincorporated pyrrolobenzoxazine heterocycle employing [1,2]-Meisenheimer rearrangement.…”

“…41 These two compounds were highly effective against various pests of stored grains and agricultural plants and were also proved to be potent antiparasitic agents for the treatment and prevention of systemic infections caused by endoparasites. 41 In 2004, Didier and coworkers determined the absolute conguration of CJ-12662 (40) by single-crystal X-ray diffraction and further conrmed the structure by a partial synthesis of the 1,2-oxazineincorporated pyrrolobenzoxazine heterocycle employing [1,2]-Meisenheimer rearrangement. 42 From the soil-derived fungus Paecilomyces BAUA3058, a new terpenoid pyrrolobenzoxazine paeciloxazine (42), which differed from other congeners mainly in the sesquiterpene moiety, was identied by detailed spectroscopic analysis.…”

Natural products as anthelmintics: safeguarding animal health

“…thermomutatis ATCC 18618. 291 A 2004 report of a Japanese soil-derived Paecilomyces sp. BAUA3058 described the closely related paeciloxazine (5.45) as active in vitro against R. pseudoelongata (EC 100 50 mg mL −1 ) (the cause of otitis externa in cattle), 292 with a 2022 isolation from Penicillium janthinellum assigning the absolute conguration and characterising the biosynthesis.…”

An experiment on the alleviation of wafer-bending for CVD grown heavily Al-doped 4H-SiC epi-wafer by co-doping of N

“…Contrarily, the aand c-lattice constants of Al-doped SiC increase when N Al >1×10 19 cm -3 , where the change in c-lattice constant is greater than that in a-lattice constant. By co-doping of Al to highly N-doped 4H-SiC epilayer, we have demonstrated the improvement of crystal structure without changing the conductive type [9].…”