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next nano GmbH, Garching b. München , Germany

2017-Dec-15. www.nextnano.com stefan.birner@nextnano.com. How to treat Quaternaries in nextnano. Dr. Stefan Birner, Managing Director. next nano GmbH, Garching b. München , Germany. Material parameters needed. GaAs / AlGaAs heterostructures ( no strain )

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next nano GmbH, Garching b. München , Germany

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  1. 2017-Dec-15 www.nextnano.com stefan.birner@nextnano.com How to treat Quaternaries in nextnano Dr. Stefan Birner, Managing Director nextnano GmbH, Garching b. München, Germany

  2. Material parameters needed GaAs/AlGaAsheterostructures (no strain) • effectivemasses(me, mhh, mlh, mso, ...) ork∙pparameters • band gapEgap, split-off energy • band offsets(CBO, VBO) • dielectricconstant (Poissonequation)

  3. Ternaries • Linear interpolation • Quadratic interpolation using a constant bowing parameter • Interpolation using a bowingparameterwhichdepends on alloycontentx

  4. Ternaries Ternary • Binaries GaAs, AlAs Ternary AlxGa1-xAs = xAlAs + (1-x) GaAs • BowingparameterC – Cx(1-x) – C(x)x(1-x) might depend on alloy content x

  5. Quaternaries • Quaternary: AlxGa1-xAsyP1-y III-III-V-V III-III-III-V, III-V-V-V

  6. Quaternaries AlxGa1-xIn1-x-yAs III-III-III-V III-V-V-V 10 parameters!

  7. Quaternaries AlxGa1-xAsyP1-yIII-III-V-V 13 parameters!

  8. Material parameters needed GaAs/InGaAsheterostructures (strain!) • ... + • latticeconstant • elasticconstants (2-3 parameters) • piezoelectricconstant • deformationpotentials (3-8 parameters)

  9. nextnano++ software • http://www.nextnano.com/nextnanoplus/software_documentation/database/zincblende.htm • http://www.nextnano.com/nextnanoplus/software_documentation/input_file/structure.htm

  10. More information • PhD thesis T. Zibold(Appendix E) • http://www.nextnano.com/information/publications.php • nextnano³ softwarehttp://www.nextnano.com/nextnano3/input_parser/database/docu/quaternaries.htmhttp://www.nextnano.com/nextnano3/tutorial/1Dtutorial_AlGaInP_onGaAs.htm

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