09:00 〜 09:15
[3Da01] SiドープGaN中ドーパント活性サイトの化学状態・原子構造
X-ray absorption near-edge structure (XANES) and photoelectron spectroscopy were used to investigate the active and inactive dopant sites in Si-doped GaN. Si-doped GaN formed two dopant states, which were attributed to Si3N4 and SiNx. From the Si K-edge XANES, the Si3N4 state did not exhibit electronic states in the GaN bandgap, indicating inactive dopant sites in GaN, whereas the SiNx state exhibited bandgap states. Thus, the SiNx state should act as an active dopant site in Si-doped GaN. The simulation of XANES spectra well reproduced the electronic state in the GaN-bandgap when the Ga atom is replaced by the Si atom, suggesting that the active dopant site may be the Si-substituted Ga sites.