Effects of illumination on the excess carrier dynamics and variations of the surface states in an AlGaN/GaN heterostructure

被引:12
|
作者
Chang, Yun-Chorng [1 ,2 ,3 ]
机构
[1] Natl Cheng Kung Univ, Inst Electroopt Sci & Engn, Tainan 701, Taiwan
[2] Natl Cheng Kung Univ, Adv Optoelect Technol Ctr, Tainan 701, Taiwan
[3] Natl Cheng Kung Univ, Ctr Micro Nano Sci & Technol, Tainan 701, Taiwan
关键词
aluminium compounds; charge exchange; conduction bands; gallium compounds; III-V semiconductors; lighting; surface states; two-dimensional electron gas; valence bands; wide band gap semiconductors; FIELD-EFFECT TRANSISTORS; HEMTS; GAS;
D O I
10.1063/1.3295916
中图分类号
O59 [应用物理学];
学科分类号
摘要
Light illumination was observed to be able to change the charge status of surface states in an AlGaN/GaN heterostructure and vary the conductivity of the two-dimensional electron gas channel. The effects of several parameters, including sample temperature, intensity of the ultraviolet (UV) light, wavelength, and intensity of the laser light, were investigated and mathematically analyzed. A physical model that described the dynamics of excess carriers to different light illumination was proposed. Excess carriers created by UV light are able to reach the surface states after overcoming the valence and conduction band discontinuities by absorbing thermal energy and energy of the subsequently incident photon, respectively. Understanding the effect of the ambient illumination can help to achieve a higher sensitivity for an AlGaN/GaN sensor and discover new applications in the future.
引用
收藏
页数:7
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