Origin of the anomalous temperature evolution of Photoluminescence peak energy in degenerate InN nanocolumns

Pai Chun Wei, Surojit Chattopadhyay, Fang Sheng Lin, Chih Ming Hsu, Shyankay Jou, Tai Chen, Ping Jung Huang, Hsu Cheng Hsu, Han Chang Shih, Kuei Hsien Chen, Li Chyong Chen

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Photoluminescence (PL) behaviour in InN nanocolumns reveal decreasing, increasing and near invariant peak energies (EPL) as a function of temperature. Samples, having EPL∼0.730 eV at 20 K., showed temperature invariance of EPL. Samples possessing EPL on the lower and higher energy side of 0.730 eV demonstrate a normal redshift and anomalous blueshift, respectively, with increasing temperature. This temperature evolution can be effectively explained on the basis of a competition between a conventional red shift from lattice dilation, dominant for low carrier density sample, on one hand, and a blue shift of the electron and hole quasi Fermi-level separation, dominant for high carrier density samples, on the other.

Original languageEnglish
Pages (from-to)11690-11697
Number of pages8
JournalOptics Express
Volume17
Issue number14
DOIs
Publication statusPublished - 2009 Jul 6

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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