Exploring benefits of composition grading for forward-IV characteristics of In1-xGaxAs LEDs for cryogenic applications

摘要

The rise of cryogenic technologies such as quantum computing P. Platzman and M. Dykman, Science 284, 1967 (1999) calls for semiconductor devices that can operate efficiently and with low thermal leak at low temperatures. To better understand the behavior of light-emitting diodes (LEDs) at these extreme temperatures, we derive the LED forward characteristics in the case of an InGaAs single-quantum well. We demonstrate the benefits of composition grading for increasing LED current, especially at low temperatures. This is done by deriving the optimum indium composition as a function of position. The results of the derivation are compared with COMSOL Multiphysics simulations and are found to match well.