Origin of the anomalous temperature evolution of photoluminescence peak energy in degenerate InN nanocolumns.
Photoluminescence (PL) behaviour in InN nanocolumns reveal decreasing, increasing and near invariant peak energies (E(PL)) as a function of temperature. Samples, having E(PL)~0.730 eV at 20 K, showed temperature invariance of E(PL). Samples possessing E(PL) 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.
Wei
Pai-Chun
PC
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
Chattopadhyay
Surojit
S
Lin
Fang-Sheng
FS
Hsu
Chih-Ming
CM
Jou
Shyankay
S
Chen
Jr-Tai
JT
Huang
Ping-Jung
PJ
Hsu
Hsu-Cheng
HC
Shih
Han-Chang
HC
Chen
Kuei-Hsien
KH
Chen
Li-Chyong
LC
D004867:Equipment Design; D007204:Indium / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D010777:Photochemistry / Q000379:methods*; D012666:Semiconductors; D013053:Spectrophotometry / Q000379:methods; D013696:Temperature
D007204:Indium; C513701:indium nitride