32 citations · 64 across the 3 of their papers we have counts for
3 papers
Negative-charge-storing mechanism of potassium-ion electrets used for vibration-powered generators: Microscopic study of a-SiO2 with and without potassium atoms
Toru Nakanishi, Takeshi Miyajima, Kenta Chokawa +5
A potassium-ion electret, which is a key element of vibration-powered microelectromechanical generators, can store negative charge almost permanently. However, the mechanism by whi…
Screw dislocation that converts p-type GaN to n-type: Microscopic study on the Mg condensation and the leakage current in p-n diodes
Takashi Nakano, Yosuke Harashima, Kenta Chokawa +9
Recent experiments suggest that Mg condensation at threading dislocations induce current leakage, leading to degradation of GaN-based power devices. To study this issue, we perform…
Intrinsic Origin of Negative Fixed Charge in Wet Oxidation for Silicon Carbide
Yasuhiro Ebihara, Kenta Chokawa, Shigenori Kato +2
We demonstrate on the basis of first-principles calculations that the formation of carbonate-like moiety in SiO could be the intrinsic origin of negative fixed charge in SiC th…