nextnano.NEGF - Software for
Quantum Transport

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==== Wurtzite QW LED simulation ====

In the following tutorial we demonstrate how can a wurtzite single Quantum well diode be simulated. 

The structure is built from the following composition depicted in Figure {{ref>bandstructure0}}. 

<figure bandstructure0>
;#;
{{nnp:optics:bandedges0.png}}
;#;
<caption>Band edges without external bias</caption>
</figure>


The band edges can be simulated upon external bias, which is plotted in Figure {{ref>bandstructure}}. 

<figure bandstructure>
;#;
{{nnp:optics:bandedges.png}}
;#;
<caption>Band edges and quasi-Fermi levels of the **p-i-n** diode under forward bias (2.8V)</caption>
</figure>

The bias voltage dependence of the structure can be simulated using drift diffusion method, coupled various recombination processes (SRH, Auger, Direct recombination)   
The emission spectra due direct recombination is plotted in figure {{ref>spectra}}. 


<figure spectra>
;#;
{{nnp:optics:emission_spectrum.png}}
;#;
<caption>Emission spectrum of the structure</caption>
</figure>

The quantum efficiency is plotted in  {{ref>iqe}}.  

<figure iqe>
;#;
{{nnp:optics:iqe.png}}
;#;
<caption>Internal quantum efficiency</caption>
</figure>

The input file can be downloaded from {{nnp:optics:sqw_led_wz.zip?linkonly | here }}

nextnano.NEGF - Software for Quantum Transport

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nextnano.NEGF - Software for
Quantum Transport