Thermoelectric Model of the InGaN/GaN Light Emission Diode with Allowance for the Substrate Heterostructure Effect

Abstract

Accounting for the production of heat in high-ohmic substrates of heterostructural light-emitting diodes (LEDs) is an important factor, determining their functional properties, limiting operation modes, and reliability. A nonlinear thermoelectric model of the InGaN/GaN LED is presented, taking into account Joule thermal generation in a semiconductor substrate. The potential distribution on structural elements and the dependence on the current of the thermal resistance of a semiconductor structure of the device are obtained. The adequacy of the model is confirmed by comparing the calculated and experimental dependences of the thermal resistance of a high-power LED on the total current. The thermoelectric model of the LED with allowance for Joule heat production allows us to calculate its thermal resistance. The adequacy of the model is confirmed experimentally.