Current Spreading Eff ects in Vertical GaN-Based Light-Emitting Dio de on Si(111) Substrate

摘要

The optimal design of GaN-based Light-emitting diode (LED) is important for its reliability. In this work, a new three-Dimensional (3D) circuit model with a resistor network is developed to study the current distribution in the active layer of vertical conducting GaN-based LED grown on Si(111) substrate with different struc-tures and electrode patterns. It consists of resistance of Transparent conductive layer (TCL), resistance of epitax-ial layer, intrinsic diodes presenting the active layer, and AlN/Si junction as which the multilayer of AlN/Si is as-sumed. Simulations results of current distribution in active layers of two kinds of LED structures show that current distribution uniformity is greatly affected by the electrode pattern and the LED structure. Furthermore, the exper-imentally measured light emission uniformity agrees well with simulation results. The electrical and optical char-acteristics of LED are obviously affected by the current distribution uniformity.