摘要
The effects of a polarization field on the current transport mechanisms in ultraviolet light emitting diodes(UV-LEDs)are studied by analyzing forward current-voltage(I–V)characteristics based on the experimental data and theoretical simulation.The results indicate that polarization electric field suppresses the diffusion current and meanwhile enhances the tunneling current in the metal-face UV LEDs under forward bias.The presence of a large polarization field in the deep UV-LEDs is responsible for the current transport mechanism dominated by the tunneling process at a moderate forward bias.
基金
Supported by the National Basic Research Program of China under Grant Nos 2012CB619306,2010CB327504 and 2009CB320300
the Natural Science Foundation of Jiangsu Province under Grant No BK2011010,the National Natural Science Foundation of China under Grant Nos 61274075,60936004,and 60990311
the Ph.D.Program Foundation of Ministry of Education of China under Grant No 20110091110032.
