Capture-escape model in 5 quantum well GaN LED

ledex09.in : Capture-escape model in 5 quantum well GaN LED

Requires: Blaze/Quantum/LED Minimum Versions: Atlas 5.28.1.R

This example demonstrates how to capture-escape model for quantum well LED. Capture-escape model allows to track dynamics of bound carriers in quantum wells. It also allows to account for the effect of quantum charge by including it self-consistently into Poisson equation.

There are several model parameters that specify quantum well and capture-escape model. Quantum well regions are declared with QWELL parameter in order to solve Schrodinger equation and LED parameter in order to output luminous power for each well into the IV log file. Wurtzite 3-band k.p-based band structure is specified by WZ.THREE parameter. K.P parameter forces drift-diffusion equation to use k.p based band edges. Parameter WELL.CAPT launches capture-escape model and parameter WELL.INPLANE allows 2D carriers to move along the quantum well. SPONTANEOUS parameter in quantum well regions will launch calculation of spontaneous emission; a simpler model for optical recombination is used in barriers, launched by OPTR parameter. Everywhere in the device Shockley-Read-Hall ( SRH ) and Auger ( AUGER ) recombination is calculated. Finally, parameter WELL.SELFCON forces two effects: 1) band edge for bulk carriers is modified in quantum well regions to remove wells. This effectively reduces bulk carrier density in these regions, by allowing only bulk carrier with energies above the barrier; 2) quantum charge is added to the total carrier charge and included into Poisson equation. In order to include all quantum charge, the maximum allowed number of subbands is increased by setting parameter WELL.CNBS and WELL.VNBS . To improve convergence, predictor-corrector scheme is used. WELL.NPRED parameter specifies that there are seven predictor iterations per one corrector iteration.

To obtain the EL spectrum, the SPECTRUM parameter on the SAVE statement. The range of the spectrum is determined automatically.

To load and run this example, select the Load button in DeckBuild > Examples. This will copy the input file and any support files to your current working directory. Select the Run button in DeckBuild to execute the example.