Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers

被引：1405

作者：

Gutierrez, Humberto R. ^{[1
]}

Perea-Lopez, Nestor ^{[1
]}

Elias, Ana Laura ^{[1
]}

Berkdemir, Ayse ^{[1
]}

Wang, Bei ^{[1
]}

Lv, Ruitao ^{[1
]}

Lopez-Urias, Florentino ^{[1
]}

Crespi, Vincent H. ^{[1
]}

Terrones, Humberto ^{[1
]}

Terrones, Mauricio ^{[1
,2
,3
]}

机构：

[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[3] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

来源：

NANO LETTERS | 2013年 / 13卷 / 08期

基金：

美国国家科学基金会;

关键词：

Metal dichalcogenides; tungsten disulfide; 2D materials; photoluminescence; Raman; INORGANIC FULLERENE-LIKE; MOS2 ATOMIC LAYERS; LARGE-AREA; OPTICAL-ABSORPTION; CRYSTAL-STRUCTURES; 1ST PRINCIPLES; MS2; M; GROWTH; PHASE; FILMS;

D O I：

10.1021/nl3026357

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Individual monolayers of metal dichalcogenides are atomically thin two-dimensional crystals with attractive physical properties different from those of their bulk counterparts. Here we describe the direct synthesis of WS2 monolayers with triangular morphologies and strong room-temperature photoluminescence (PL). The Raman response as well as the luminescence as a function of the number of S-W-S layers is also reported. The PL weakens with increasing number of layers due to a transition from direct band gap in a monolayer to indirect gap in multilayers. The edges of WS2 monolayers exhibit PL signals with extraordinary intensity, around 25 times stronger than that at the platelet's center. The structure and chemical composition of the platelet edges appear to be critical for PL enhancement.

引用

页码：3447 / 3454

页数：8

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