Dominant Influence of Interface Roughness Scattering on the Performance of GaN Terahertz Quantum Cascade Lasers.
Nanoscale Res Lett
; 14(1): 206, 2019 Jun 17.
Article
en En
| MEDLINE
| ID: mdl-31209591
ABSTRACT
Effect of interface roughness of quantum wells, non-intentional doping, and alloy disorder on performance of GaN-based terahertz quantum cascade lasers (QCL) has been investigated by the formalism of nonequilibrium Green's functions. It was found that influence of alloy disorder on optical gain is negligible and non-intentional doping should stay below a reasonable concentration of 1017 cm-3 in order to prevent electron-impurities scattering degradation and free carrier absorption. More importantly, interface roughness scattering is found the dominating factor in optical gain degradation. Therefore, its precise control during the fabrication is critical. Finally, a gain of 60 cm-1 can be obtained at 300 K, showing the possibility of fabricating room temperature GaN Terahertz QCL.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Nanoscale Res Lett
Año:
2019
Tipo del documento:
Article
País de afiliación:
China