Variation of photoluminescence spectral line shape of monolayer WS2

被引:16
作者
Kwon, Yongjae [1 ]
Kim, Kangwon [1 ]
Kim, Wontaek [2 ]
Ryu, Sunmin [2 ,3 ]
Cheong, Hyeonsik [1 ]
机构
[1] Sogang Univ, Dept Phys, Seoul 04107, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Dept Chem, Pohang 37673, South Korea
[3] Pohang Univ Sci & Technol POSTECH, Div Adv Mat Sci, Pohang 37673, South Korea
基金
新加坡国家研究基金会;
关键词
Tungsten disulfide; Photoluminescence; Exciton; Trion; Second harmonic generation; EXCITON BINDING-ENERGY; SINGLE; STATES; EDGE;
D O I
10.1016/j.cap.2018.05.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The origin of the variation of photoluminescence (PL) spectra of monolayer tungsten disulfide (WS2) is investigated systematically. Dependence of the PL spectrum on the excitation power show that the relatively sharp component corresponds to excitons whereas the broader component at slightly lower energy corresponds to negatively charged trions. PL imaging and second harmonic generation measurements show that the trion signals are suppressed more than the exciton signals near the edges, thereby relatively enhancing the excitonic feature in the PL spectrum and that such relative enhancement of the exciton signals is more pronounced near approximately armchair edges. This effect is interpreted in terms of depletion of free electrons near the edges caused by structural defects and adsorption of electron acceptors such as oxygen atoms.
引用
收藏
页码:941 / 945
页数:5
相关论文
共 42 条
[1]   Equilibrium at the edge and atomistic mechanisms of graphene growth [J].
Artyukhov, Vasilii I. ;
Liu, Yuanyue ;
Yakobson, Boris I. .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2012, 109 (38) :15136-15140
[2]   Identification of individual and few layers of WS2 using Raman Spectroscopy [J].
Berkdemir, Ayse ;
Gutierrez, Humberto R. ;
Botello-Mendez, Andres R. ;
Perea-Lopez, Nestor ;
Elias, Ana Laura ;
Chia, Chen-Ing ;
Wang, Bei ;
Crespi, Vincent H. ;
Lopez-Urias, Florentino ;
Charlier, Jean-Christophe ;
Terrones, Humberto ;
Terrones, Mauricio .
SCIENTIFIC REPORTS, 2013, 3
[3]   Optical identification of sulfur vacancies: Bound excitons at the edges of monolayer tungsten disulfide [J].
Carozo, Victor ;
Wang, Yuanxi ;
Fujisawa, Kazunori ;
Carvalho, Bruno R. ;
McCreary, Amber ;
Feng, Simin ;
Lin, Zhong ;
Zhou, Chanjing ;
Perea-Lopez, Nestor ;
Laura Elias, Ana ;
Kabius, Bernd ;
Crespi, Vincent H. ;
Terrones, Mauricio .
SCIENCE ADVANCES, 2017, 3 (04)
[4]   Symmetry-dependent phonon renormalization in monolayer MoS2 transistor [J].
Chakraborty, Biswanath ;
Bera, Achintya ;
Muthu, D. V. S. ;
Bhowmick, Somnath ;
Waghmare, U. V. ;
Sood, A. K. .
PHYSICAL REVIEW B, 2012, 85 (16)
[5]   Electrical Tuning of Exciton Binding Energies in Monolayer WS2 [J].
Chernikov, Alexey ;
van der Zande, Arend M. ;
Hill, Heather M. ;
Rigosi, Albert F. ;
Velauthapillai, Ajanth ;
Hone, James ;
Heinz, Tony F. .
PHYSICAL REVIEW LETTERS, 2015, 115 (12)
[6]   Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2 [J].
Chernikov, Alexey ;
Berkelbach, Timothy C. ;
Hill, Heather M. ;
Rigosi, Albert ;
Li, Yilei ;
Aslan, Ozgur Burak ;
Reichman, David R. ;
Hybertsen, Mark S. ;
Heinz, Tony F. .
PHYSICAL REVIEW LETTERS, 2014, 113 (07)
[7]   Bandgap Engineering of Strained Monolayer and Bilayer MoS2 [J].
Conley, Hiram J. ;
Wang, Bin ;
Ziegler, Jed I. ;
Haglund, Richard F., Jr. ;
Pantelides, Sokrates T. ;
Bolotin, Kirill I. .
NANO LETTERS, 2013, 13 (08) :3626-3630
[8]   Optical control of charged exciton states in tungsten disulfide [J].
Currie, M. ;
Hanbicki, A. T. ;
Kioseoglou, G. ;
Jonker, B. T. .
APPLIED PHYSICS LETTERS, 2015, 106 (20)
[9]   Possible doping strategies for MoS2 monolayers: An ab initio study [J].
Dolui, Kapildeb ;
Rungger, Ivan ;
Das Pemmaraju, Chaitanya ;
Sanvito, Stefano .
PHYSICAL REVIEW B, 2013, 88 (07)
[10]   Aging of Transition Metal Dichalcogenide Monolayers [J].
Gao, Jian ;
Li, Baichang ;
Tan, Jiawei ;
Chow, Phil ;
Lu, Toh-Ming ;
Koratkar, Nikhil .
ACS NANO, 2016, 10 (02) :2628-2635