Hot exciton relaxation in CdZnSe/ZnSe quantum wells and quantum dots

被引：3

作者：

Bacher, G

Spiegel, R

Kummell, T

Weigand, R

Forchel, A

Jobst, B

Hommel, D

Landwehr, G

机构：

[1] Univ Wurzburg, D-97074 Wurzburg, Germany

[2] Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany

来源：

JOURNAL OF CRYSTAL GROWTH | 1998年 / 184卷

关键词：

CdZnSe/ZnSe; exciton relaxation; quantum dots; quantum wells;

D O I：

10.1016/S0022-0248(97)00613-1

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The dimensionality dependence of hot exciton relaxation has been studied by means of time-resolved photoluminescence and photoluminescence excitation spectroscopy comparing CdZnSe/ZnSe quantum wells and quantum dots. An energetically narrow exciton distribution within the inhomogeneously broadened luminescence band is prepared by low density laser excitation with an excess energy corresponding to an integer number of LO phonons. In quantum wells, lateral migration of excitons within the layer causes a transient redistribution of excitons in energy controlled by acoustic phonon interaction. This is indicated by a spectral broadening and a red shift of the PL signal with time. In contrast, this process is found to be substantially suppressed in quantum dots due to the three-dimensional exciton confinement. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：330 / 333

页数：4

共 11 条

[1] EXCITON RELAXATION AND RADIATIVE RECOMBINATION IN SEMICONDUCTOR QUANTUM DOTS [J].

BOCKELMANN, U .

PHYSICAL REVIEW B, 1993, 48 (23) :17637-17640

[2] RELAXATION OF EXCITONS IN COHERENTLY STRAINED CDTE/ZNTE QUANTUM-WELLS [J].

COLLET, JH ;

KALT, H ;

DANG, LS ;

CIBERT, J ;

SAMINADAYAR, K ;

TATARENKO, S .

PHYSICAL REVIEW B, 1991, 43 (08) :6843-6846

[3] LINEWIDTH DEPENDENCE OF RADIATIVE EXCITON LIFETIMES IN QUANTUM-WELLS [J].

FELDMANN, J ;

PETER, G ;

GOBEL, EO ;

DAWSON, P ;

MOORE, K ;

FOXON, C ;

ELLIOTT, RJ .

PHYSICAL REVIEW LETTERS, 1987, 59 (20) :2337-2340

[4] Low-temperature kinetics of localized excitons in nanostructures [J].

Golub, LE ;

Ivchenko, EL ;

Kiselev, AA .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1996, 13 (06) :1199-1204

[5] LATERAL QUANTIZATION EFFECTS IN LITHOGRAPHICALLY DEFINED CDZNSE/ZNSE QUANTUM DOTS AND QUANTUM WIRES [J].

ILLING, M ;

BACHER, G ;

KUMMELL, T ;

FORCHEL, A ;

ANDERSSON, TG ;

HOMMEL, D ;

JOBST, B ;

LANDWEHR, G .

APPLIED PHYSICS LETTERS, 1995, 67 (01) :124-126

[6] BAND OFFSETS AND EXCITON BINDING-ENERGIES IN ZN1-XCDXSE-ZNSE QUANTUM-WELLS GROWN BY METAL-ORGANIC VAPOR-PHASE EPITAXY [J].

LIACI, F ;

BIGENWALD, P ;

BRIOT, O ;

GIL, B ;

BRIOT, N ;

CLOITRE, T ;

AULOMBARD, RL .

PHYSICAL REVIEW B, 1995, 51 (07) :4699-4702

[7] Zero-dimensional excitons in (Zn,Cd)Se quantum structures [J].

Lowisch, M ;

Rabe, M ;

Stegemann, B ;

Henneberger, F ;

Grundmann, M ;

Turck, V ;

Bimberg, D .

PHYSICAL REVIEW B, 1996, 54 (16) :11074-11077

[8] HOT EXCITONS IN SEMICONDUCTORS [J].

PERMOGOROV, S .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 1975, 68 (01) :9-42

[9] EXCITATION-SPECTRA OF LUMINESCENCE IN CADMIUM-SULFIDE [J].

PLANEL, R ;

BONNOT, A ;

BENOIT, C .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1973, 58 (01) :251-266

[10] RELAXATION KINETICS AND PHOTOLUMINESCENCE LINESHAPE OF EXCITONS IN II-VI SEMICONDUCTOR QUANTUM-WELLS [J].

RUNGE, E ;

SCHULZGEN, A ;

HENNEBERGER, F ;

ZIMMERMANN, R .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 1995, 188 (01) :547-555

← 1 2 →