S-shaped behaviour of the temperature-dependent energy band gap in dilute nitrides

Mazzucato S., Potter R., Erol A., Balkan N., Chalker P., Joyce T., ...More

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, vol.17, pp.242-244, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 17
  • Publication Date: 2003
  • Doi Number: 10.1016/s1386-9477(02)00783-x
  • Journal Name: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.242-244
  • Keywords: S-shaped, GaInNAs, GaNAs, temperature dependent photoluminescence, QUALITY
  • Istanbul University Affiliated: Yes

Abstract

We have investigated the temperature dependence of the band gap energy in GaInNAs, GaNAs and InGaAs quantum wells. In the structures containing nitrogen the well-known S-shaped characteristic was observed at low temperatures. We explain this anomalous temperature behaviour by strong carrier localization in potential fluctuations at low temperatures. In the nitrogen free samples, there was no S-shaped behaviour and the empirical Varshni dependence was followed. (C) 2002 Elsevier Science B.V. All rights reserved.