To clarify the mechanism of the dip and hump during the photoquenching process observed in the time-dependent piezoelectric photoacoustic (PPA) signal, the PPA spectra were measured by changing the illumination time of the quenching-light of 1.12 eV at 80 K. It was found that a distinctive peak appeared around 1.1 eV and moved to higher photon energy side with increasing the illumination time. A contribution of the deep level that changes the activation energy during the photoquenching process is considered.
|ジャーナル||Journal of Crystal Growth|
|出版ステータス||Published - 2000 3 1|
|イベント||8th International Conference on Defects-Recognition, Imaging and Physics in Semiconductors - Narita, Jpn|
継続期間: 1999 9 15 → 1999 9 18
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