Engineering Disorder in Opto-Electronics

By Jacob B. Khurgin

Electrical and Computer Engineering, Johns Hopkins Univeristy, Baltimore, MD

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Abstract

GaN is a wide bandgap material which can on one hand withstand high power and high temperature operating conditions, and on the other hand has high saturation velocity needed for high frequency operation. This tremendous potential has not been fully realized yet and in this talk it will be shown that it is most probably due to hot longitudinal optical phonons effect. Then it will be demonstrated that introducing a certain degree of alloy or isotope disorder can mitigate hot phonon effects and improve performance of GaN transistors.

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Researchers should cite this work as follows:

  • Jacob B. Khurgin (2012), "Engineering Disorder in Opto-Electronics," https://nanohub.org/resources/16043.

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203 Physics, Purdue Universtiy, West Lafayette, IN

Tags

Engineering Disorder in Opto-Electronics
  • Engineering disorder in Opto-Electronics 1. Engineering disorder in Opto-E… 0
    00:00/00:00
  • What is it all about 2. What is it all about 91.424758091424764
    00:00/00:00
  • Mitigating Hot Phonon Effects in GaN HEMT using disorder 3. Mitigating Hot Phonon Effects … 132.43243243243245
    00:00/00:00
  • Why GaN FET? 4. Why GaN FET? 143.94394394394394
    00:00/00:00
  • Saturation Velocity 5. Saturation Velocity 166.09943276609943
    00:00/00:00
  • What causes velocity saturation? 6. What causes velocity saturatio… 189.78978978978981
    00:00/00:00
  • What causes velocity saturation? 7. What causes velocity saturatio… 245.87921254587923
    00:00/00:00
  • What else? 8. What else? 268.70203536870207
    00:00/00:00
  • Roles of LO Phonons 9. Roles of LO Phonons 330.296963630297
    00:00/00:00
  • What is special about GaN 10. What is special about GaN 441.97530864197535
    00:00/00:00
  • What is special about GaN 11. What is special about GaN 548.3483483483484
    00:00/00:00
  • What is special about GaN 12. What is special about GaN 586.08608608608608
    00:00/00:00
  • Too few phonons? 13. Too few phonons? 635.36870203536876
    00:00/00:00
  • Real phonon bottleneck 14. Real phonon bottleneck 831.69836503169836
    00:00/00:00
  • What we got? 15. What we got? 956.08942275608945
    00:00/00:00
  • Data: Measured, APL 89 202117 (2006) 16. Data: Measured, APL 89 202117 … 989.3226559893227
    00:00/00:00
  • LO modes per electron (out of at least 104) 17. LO modes per electron (out of … 1017.4174174174175
    00:00/00:00
  • Heating 18. Heating 1042.8428428428429
    00:00/00:00
  • Evidence of Hot Phonons 19. Evidence of Hot Phonons 1044.8782115448782
    00:00/00:00
  • Evidence of Hot Phonons 20. Evidence of Hot Phonons 1086.252919586253
    00:00/00:00
  • Evidence of Hot Phonons 21. Evidence of Hot Phonons 1142.4424424424426
    00:00/00:00
  • AS Raman Measurements of working device Xu et al Appl. Phys. Lett. 93, 051912 (2008) 22. AS Raman Measurements of worki… 1193.727060393727
    00:00/00:00
  • AS Raman Measurements of working device Xu et al APL, 2008 23. AS Raman Measurements of worki… 1229.1624958291625
    00:00/00:00
  • How to improve Neff/N 24. How to improve Neff/N 1271.9386052719387
    00:00/00:00
  • This is what we want 25. This is what we want 1349.84984984985
    00:00/00:00
  • Disorder to the rescue 26. Disorder to the rescue 1398.0313646980314
    00:00/00:00
  • Effect of isotope disorder 27. Effect of isotope disorder 1483.6503169836503
    00:00/00:00
  • Estimate of isotope disorder Appl. Phys. Lett. 93, 032110 (2008) 28. Estimate of isotope disorder A… 1591.4581247914582
    00:00/00:00
  • Clustering 29. Clustering 1638.4718051384718
    00:00/00:00
  • Results –LO phonon generation Appl. Phys. Lett. 93, 032110 (2008) 30. Results –LO phonon generatio… 1648.8154821488156
    00:00/00:00
  • Results-relaxation rates 31. Results-relaxation rates 1685.985985985986
    00:00/00:00
  • Results -transport 32. Results -transport 1767.0003336670004
    00:00/00:00
  • Preliminary Experiments: Growth 33. Preliminary Experiments: Growt… 1811.8118118118118
    00:00/00:00
  • Preliminary Experiments: Fabrication 34. Preliminary Experiments: Fabri… 1843.6102769436104
    00:00/00:00
  • First evidence of Increased Current 35. First evidence of Increased Cu… 1861.4280947614282
    00:00/00:00
  • Conclusions 36. Conclusions 1898.5318651985319
    00:00/00:00