电场
异质结
材料科学
宽禁带半导体
费米气体
光电子学
凝聚态物理
电子
光谱学
电压
物理
量子力学
作者
C. Buchheim,R. Goldhahn,G. Gobsch,Katja Tonisch,V. Cimalla,Florentina Niebelschütz,O. Ambacher
摘要
Ga-face GaN∕AlGaN∕GaN heterostructures with different cap thicknesses are investigated by electroreflectance spectroscopy (ER). The voltage dependent electric field strengths of the barrier and cap layers are determined. The AlGaN electric field amounts of up to −2.6MV∕cm, whereas the GaN electric field is always below 700kV∕cm. The two electric fields have opposite signs. Characteristic features in the voltage maps of the ER spectra are assigned to the formation/depletion of a two-dimensional electron gas below and a two-dimensional hole gas above the AlGaN barrier. Between −6.5 and 0V, both carrier gases coexist.
科研通智能强力驱动
Strongly Powered by AbleSci AI