Radiative recombination of excitons in the transition-metal dichalcogenides MoS2:Cl2 and WS2:Br2

被引：6

作者：

Charron, L

Dumchenko, D

Fortin, E

Gherman, C

Kulyuk, L ^{[1
]}

机构：

[1] Moldavian Acad Sci, Inst Phys Appl, Kishinev 2028, Moldova

[2] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada

来源：

JOURNAL OF LUMINESCENCE | 2005年 / 112卷 / 1-4期

关键词：

photoluminescence; bound excitons; intercalation;

D O I：

10.1016/j.jlumin.2004.09.077

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The comparative study of the excitonic radiative recombination in 2H-MoS2:Cl-2 and 2H-WS2:Br-2 layered crystals is presented. The steady-state emission spectra of both the investigated materials include two distinct regions. The short-wavelength region consisting of sharp lines is produced by bound excitons, related to the halogen molecules intercalated in the layered semiconductors during the growth process. The second spectral region-a vibronic broad band identical for both types of crystals, is attributed to the deep radiative centres, caused by the intrinsic defects of the host lattices. The atypical temperature increase of the excitonic radiative decay time observed for 2H-WS2:Br-2 in the range T 2-7 K is related to the presence of a long lifetime sublevel, placed 0.3 meV above the lowest excitonic state. (c) 2004 Published by Elsevier B.V.

引用

页码：45 / 49

页数：5

共 19 条

[1]

ARUCHAMY A, 1992, PHOTOELECTROCHEMISTY

[2]

ARUSHANOV E, 1996, P 19 INT SEM C CAS 9

[3] TRANSIENT CHARACTERISTICS OF EXCITONS BOUND AT HOLE-ATTRACTIVE ISOELECTRONIC CENTERS IN GAP [J].

BERGMAN, P ;

MONEMAR, B ;

PISTOL, ME .

PHYSICAL REVIEW B, 1989, 40 (18) :12280-12289

[4] Band structure of MoS2, MoSe2, and α-MoTe2:: Angle-resolved photoelectron spectroscopy and ab initio calculations -: art. no. 235305 [J].

Böker, T ;

Severin, R ;

Müller, A ;

Janowitz, C ;

Manzke, R ;

Voss, D ;

Krüger, P ;

Mazur, A ;

Pollmann, J .

PHYSICAL REVIEW B, 2001, 64 (23)

[5]

DEAN J, 1979, EXCITONS, P55

[6] INTERCALATION COMPOUNDS OF GRAPHITE [J].

DRESSELHAUS, MS ;

DRESSELHAUS, G .

ADVANCES IN PHYSICS, 1981, 30 (02) :139-326

[7] TEMPERATURE-DEPENDENCE OF ELECTRICAL-CONDUCTIVITY AND HALL-COEFFICIENT IN 2H-MOS2, MOSE2, WSE2, AND MOTE2 [J].

ELMAHALAWY, SH ;

EVANS, BL .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 1977, 79 (02) :713-722

[8]

FRIENDT RH, 1987, ADV PHYS, V36, P2

[9]

GIL M, 1985, PHYS REV B, V32, P6650

[10]

HUSSAIN A, 2003, PHYS REV B, V68, DOI UNSP 125101

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