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Sub-Bandgap Laser Light-Induced Excess Carrier Transport Between Surface States and Two-Dimensional Electron Gas Channel in AlGaN/GaN Structure

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3 Author(s)
Chang, Yun-Chorng ; Adv. Optoelectron. Technol. Center, Nat. Cheng Kung Univ., Tainan, Taiwan ; Jinn-Kong Sheu ; Yun-Li Li,

Variations of the channel resistance of a AlGaN/GaN high electron mobilities transistor caused by subsequently incident photons with sub-bandgap energies after ultraviolet light-induced changes became stable were studied. Temperature-dependent measurements yielded a 0.342 eV thermal activation energy and wavelength-varying measurements yielded a 0.8 eV cut-off photon energy. The ratio between the two values is very close to the theoretical value of the ratio between the valence and conduction band discontinuities. A qualitative description about the transports of excess carriers through the band discontinuities, is also proposed and consistent with the experimental results.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:46 ,  Issue: 1 )