TY - JOUR
T1 - Internal electric field in wurtzite ZnO Zn0.78Mg0.22O quantum wells
AU - Morhain, C.
AU - Bretagnon, T.
AU - Lefebvre, P.
AU - Tang, X.
AU - Valvin, P.
AU - Guillet, T.
AU - Gil, B.
AU - Taliercio, T.
AU - Teisseire-Doninelli, M.
AU - Vinter, B.
AU - Deparis, C.
PY - 2005/12/15
Y1 - 2005/12/15
N2 - Continuous-wave, time-integrated, and time-resolved photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite ZnO Zn0.78Mg0.22O quantum wells of varying widths. By comparing experimental results with a variational calculation of excitonic energies and oscillator strengths, we determine the magnitude (0.9MV cm) of the longitudinal electric field that is induced by both spontaneous and piezoelectric polarizations. The quantum-confined Stark effect counteracts quantum confinement effects for well widths larger than 3nm, leading to emission energies that can lie 0.5eV below the ZnO excitonic gap and to radiative lifetimes that can be larger than milliseconds.
AB - Continuous-wave, time-integrated, and time-resolved photoluminescence experiments are used to study the excitonic optical recombinations in wurtzite ZnO Zn0.78Mg0.22O quantum wells of varying widths. By comparing experimental results with a variational calculation of excitonic energies and oscillator strengths, we determine the magnitude (0.9MV cm) of the longitudinal electric field that is induced by both spontaneous and piezoelectric polarizations. The quantum-confined Stark effect counteracts quantum confinement effects for well widths larger than 3nm, leading to emission energies that can lie 0.5eV below the ZnO excitonic gap and to radiative lifetimes that can be larger than milliseconds.
UR - https://www.scopus.com/pages/publications/29644435687
U2 - 10.1103/PhysRevB.72.241305
DO - 10.1103/PhysRevB.72.241305
M3 - 文章
AN - SCOPUS:29644435687
SN - 1098-0121
VL - 72
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 24
M1 - 241305
ER -