Exciton diffusion in monolayer and bulk MoSe2

被引：113

作者：

Kumar, Nardeep ^{[1
]}

Cui, Qiannan ^{[1
]}

Ceballos, Frank ^{[1
]}

He, Dawei ^{[2
]}

Wang, Yongsheng ^{[2
]}

Zhao, Hui ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[2] Beijing Jiaotong Univ, Inst Optoelect Technol, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

来源：

NANOSCALE | 2014年 / 6卷 / 09期

基金：

美国国家科学基金会; 北京市自然科学基金;

关键词：

VALLEY POLARIZATION; HETEROSTRUCTURES; SEMICONDUCTORS; GRAPHENE; PHOTOLUMINESCENCE; PHOTOTRANSISTORS; EXFOLIATION; GENERATION; EMISSION; CARRIERS;

D O I：

10.1039/c3nr06863c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The exciton dynamics in monolayer and bulk MoSe2 samples are studied by transient absorption microscopy with a high spatiotemporal resolution. Excitons are injected with a point-like spatial distribution using a tightly focused femtosecond pulse. The spatiotemporal dynamics of these excitons are monitored by measuring transient absorption of a time-delayed and spatially scanned probe pulse. We obtain the exciton diffusion coefficients of 12 +/- 3 and 19 +/- 2 cm(2) s(-1) and exciton lifetimes of 130 +/- 20 and 210 +/- 10 ps in the monolayer and bulk samples, respectively. These values are useful for understanding excitons and their interactions with the environment in these structures and potential applications of MoSe2 in optoelectronics and electronics.

引用

页码：4915 / 4919

页数：5

共 51 条

[1] KRAMERS-KRONIG ANALYSIS OF THE REFLECTIVITY SPECTRA OF 2H-MOS2, 2H-MOSE2 AND 2H-MOTE2 [J].

BEAL, AR ;

HUGHES, HP .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (05) :881-890

[2] Visibility of dichalcogenide nanolayers [J].

Benameur, M. M. ;

Radisavljevic, B. ;

Heron, J. S. ;

Sahoo, S. ;

Berger, H. ;

Kis, A. .

NANOTECHNOLOGY, 2011, 22 (12)

[3] Strong Light-Matter Interactions in Heterostructures of Atomically Thin Films [J].

Britnell, L. ;

Ribeiro, R. M. ;

Eckmann, A. ;

Jalil, R. ;

Belle, B. D. ;

Mishchenko, A. ;

Kim, Y. -J. ;

Gorbachev, R. V. ;

Georgiou, T. ;

Morozov, S. V. ;

Grigorenko, A. N. ;

Geim, A. K. ;

Casiraghi, C. ;

Castro Neto, A. H. ;

Novoselov, K. S. .

SCIENCE, 2013, 340 (6138) :1311-1314

[4] Field-Effect Tunneling Transistor Based on Vertical Graphene Heterostructures [J].

Britnell, L. ;

Gorbachev, R. V. ;

Jalil, R. ;

Belle, B. D. ;

Schedin, F. ;

Mishchenko, A. ;

Georgiou, T. ;

Katsnelson, M. I. ;

Eaves, L. ;

Morozov, S. V. ;

Peres, N. M. R. ;

Leist, J. ;

Geim, A. K. ;

Novoselov, K. S. ;

Ponomarenko, L. A. .

SCIENCE, 2012, 335 (6071) :947-950

[5] Valley-selective circular dichroism of monolayer molybdenum disulphide [J].

Cao, Ting ;

Wang, Gang ;

Han, Wenpeng ;

Ye, Huiqi ;

Zhu, Chuanrui ;

Shi, Junren ;

Niu, Qian ;

Tan, Pingheng ;

Wang, Enge ;

Liu, Baoli ;

Feng, Ji .

NATURE COMMUNICATIONS, 2012, 3

[6] Optical identification of atomically thin dichalcogenide crystals [J].

Castellanos-Gomez, A. ;

Agrait, N. ;

Rubio-Bollinger, G. .

APPLIED PHYSICS LETTERS, 2010, 96 (21)

[7] Controlled charge trapping by molybdenum disulphide and graphene in ultrathin heterostructured memory devices [J].

Choi, Min Sup ;

Lee, Gwan-Hyoung ;

Yu, Young-Jun ;

Lee, Dae-Yeong ;

Lee, Seung Hwan ;

Kim, Philip ;

Hone, James ;

Yoo, Won Jong .

NATURE COMMUNICATIONS, 2013, 4

[8] Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials [J].

Coleman, Jonathan N. ;

Lotya, Mustafa ;

O'Neill, Arlene ;

Bergin, Shane D. ;

King, Paul J. ;

Khan, Umar ;

Young, Karen ;

Gaucher, Alexandre ;

De, Sukanta ;

Smith, Ronan J. ;

Shvets, Igor V. ;

Arora, Sunil K. ;

Stanton, George ;

Kim, Hye-Young ;

Lee, Kangho ;

Kim, Gyu Tae ;

Duesberg, Georg S. ;

Hallam, Toby ;

Boland, John J. ;

Wang, Jing Jing ;

Donegan, John F. ;

Grunlan, Jaime C. ;

Moriarty, Gregory ;

Shmeliov, Aleksey ;

Nicholls, Rebecca J. ;

Perkins, James M. ;

Grieveson, Eleanor M. ;

Theuwissen, Koenraad ;

McComb, David W. ;

Nellist, Peter D. ;

Nicolosi, Valeria .

SCIENCE, 2011, 331 (6017) :568-571

[9] Solvent Exfoliation of Transition Metal Dichalcogenides: Dispersibility of Exfoliated Nanosheets Varies Only Weakly between Compounds [J].

Cunningham, Graeme ;

Lotya, Mustafa ;

Cucinotta, Clotilde S. ;

Sanvito, Stefano ;

Bergin, Shane D. ;

Menzel, Robert ;

Shaffer, Milo S. P. ;

Coleman, Jonathan N. .

ACS NANO, 2012, 6 (04) :3468-3480

[10] MOBILITY OF CHARGE CARRIERS IN SEMICONDUCTING LAYER STRUCTURES [J].

FIVAZ, R ;

MOOSER, E .

PHYSICAL REVIEW, 1967, 163 (03) :743-&

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