TY - JOUR
T1 - Piezoelectric effects in GaN/AlGaN multiple quantum wells probed by picosecond time-resolved photoluminescence
AU - Kim, H. S.
AU - Lin, J. Y.
AU - Jiang, H. X.
AU - Chow, W. W.
AU - Botchkarev, A.
AU - Morkoç, H.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - Piezoelectric effects in GaN/AlGaN multiple quantum wells (MQWs) have been directly probed by picosecond time-resolved photoluminescence (PL) spectroscopy. The time-resolved PL spectra of the 40 angstrom well MQWs reveal that the PL transition peak position is in fact blueshifted at early delay times due to the collective effects of quantum confinement of carriers, piezoelectric field, and Coulomb screening. However, the spectral peak position shifts toward lower energies as the delay time increases and becomes redshifted at longer delay times. By comparing experimental and calculation results, we have obtained a low limit of the piezoelectric field strength to be about 560 kV/cm in the 40 angstrom well GaN/Al0.15Ga0.85N MQWs.
AB - Piezoelectric effects in GaN/AlGaN multiple quantum wells (MQWs) have been directly probed by picosecond time-resolved photoluminescence (PL) spectroscopy. The time-resolved PL spectra of the 40 angstrom well MQWs reveal that the PL transition peak position is in fact blueshifted at early delay times due to the collective effects of quantum confinement of carriers, piezoelectric field, and Coulomb screening. However, the spectral peak position shifts toward lower energies as the delay time increases and becomes redshifted at longer delay times. By comparing experimental and calculation results, we have obtained a low limit of the piezoelectric field strength to be about 560 kV/cm in the 40 angstrom well GaN/Al0.15Ga0.85N MQWs.
UR - http://www.scopus.com/inward/record.url?scp=17644447125&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:17644447125
VL - 537
SP - G3.3
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
SN - 0272-9172
Y2 - 30 November 1998 through 4 December 1998
ER -