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High Luminescence Efficiency in MoS2 Grown by Chemical Vapor Deposition

Journal Article · · ACS Nano
 [1];  [2];  [3];  [4];  [4];  [5];  [4];  [4];  [6];  [4];  [3];  [2];  [4]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Office of Scientific and Technical Information (OSTI)
  2. Army Research Lab., Adelphi, MD (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We report that one of the major challenges facing the rapidly growing field of two-dimensional (2D) transition metal dichalcogenides (TMDCs) is the development of growth techniques to enable large-area synthesis of high-quality materials. Chemical vapor deposition (CVD) is one of the leading techniques for the synthesis of TMDCs; however, the quality of the material produced is limited by defects formed during the growth process. A very useful nondestructive technique that can be utilized to probe defects in semiconductors is the room-temperature photoluminescence (PL) quantum yield (QY). It was recently demonstrated that a PL QY near 100% can be obtained in MoS2 and WS2 monolayers prepared by micromechanical exfoliation by treating samples with an organic superacid: bis(trifluoromethane)sulfonimide (TFSI). Here we have performed a thorough exploration of this chemical treatment on CVD-grown MoS2 samples. We find that the as-grown monolayers must be transferred to a secondary substrate, which releases strain, to obtain high QY by TFSI treatment. Furthermore, we find that the sulfur precursor temperature during synthesis of the MoS2 plays a critical role in the effectiveness of the treatment. By satisfying the aforementioned conditions we show that the PL QY of CVD-grown monolayers can be improved from ~0.1% in the as-grown case to ~30% after treatment, with enhancement factors ranging from 100 to 1500× depending on the initial monolayer quality. We also found that after TFSI treatment the PL emission from MoS2 films was visible by eye despite the low absorption (5–10%). Lastly, the discovery of an effective passivation strategy will speed the development of scalable high-performance optoelectronic and electronic devices based on MoS2.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0001088; AC02-05CH11231; SC0004993
OSTI ID:
1557789
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 7 Vol. 10; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (33)

Spatial Control of Photoluminescence at Room Temperature by Ferroelectric Domains in Monolayer WS 2 /PZT Hybrid Structures journal December 2016
Solution-Based Synthesis of Few-Layer WS2 Large Area Continuous Films for Electronic Applications journal February 2020
Enhancing monolayer photoluminescence on optical micro/nanofibers for low-threshold lasing. text January 2019
Tuning carrier concentration in a superacid treated MoS$_2$ monolayer text January 2018
MoS$_{2}$ pixel arrays for real-time photoluminescence imaging of redox molecules text January 2019
Surface-Functionalization-Mediated Direct Transfer of Molybdenum Disulfide for Large-Area Flexible Devices journal January 2018
Metallo‐Hydrogel‐Assisted Synthesis and Direct Writing of Transition Metal Dichalcogenides journal May 2019
Centimeter‐Scale and Visible Wavelength Monolayer Light‐Emitting Devices journal December 2019
Transient SHG Imaging on Ultrafast Carrier Dynamics of MoS 2 Nanosheets journal February 2018
Atomic Layer Deposition of Crystalline MoS 2 Thin Films: New Molybdenum Precursor for Low-Temperature Film Growth journal March 2017
Light Emission Properties of 2D Transition Metal Dichalcogenides: Fundamentals and Applications journal August 2018
Stretchable and Broadband Cavity‐Free Lasers Based on All 2D Metamaterials journal January 2020
Structural and optical characterization of stacked MoS2 nanosheets by hydrothermal method journal December 2017
Analysis of photoluminescence behavior of high-quality single-layer MoS2 journal April 2019
Stacking-controllable interlayer coupling and symmetric configuration of multilayered MoS2 journal February 2018
Evidence of indirect gap in monolayer WSe2 journal October 2017
Two-Dimensional MoxW1−xS2 Graded Alloys: Growth and Optical Properties journal August 2018
Tuning carrier concentration in a superacid treated MoS2 monolayer journal February 2019
Near-field spectral mapping of individual exciton complexes of monolayer WS 2 correlated with local defects and charge population journal January 2017
Molecular chemistry approaches for tuning the properties of two-dimensional transition metal dichalcogenides journal January 2018
Two-dimensional light-emitting materials: preparation, properties and applications journal January 2018
Near-field exciton imaging of chemically treated MoS 2 monolayers journal January 2018
Synergistic additive-mediated CVD growth and chemical modification of 2D materials journal January 2019
Remarkable quality improvement of as-grown monolayer MoS 2 by sulfur vapor pretreatment of SiO 2 /Si substrates journal January 2020
Polytype control of MoS 2 using chemical bath deposition journal May 2019
Highly sensitive MoS 2 photodetectors with graphene contacts journal March 2018
2D materials advances: from large scale synthesis and controlled heterostructures to improved characterization techniques, defects and applications journal December 2016
Dielectric impact on exciton binding energy and quasiparticle bandgap in monolayer WS 2 and WSe 2 journal March 2019
MoS 2 pixel arrays for real-time photoluminescence imaging of redox molecules journal November 2019
Enhancing monolayer photoluminescence on optical micro/nanofibers for low-threshold lasing journal November 2019
Doping of Two-Dimensional Semiconductors: A Rapid Review and Outlook journal January 2019
Enhancing monolayer photoluminescence on optical micro/nanofibers for low-threshold lasing journalarticle January 2019
Two-Dimensional Semiconductor Optoelectronics Based on van der Waals Heterostructures journal October 2016

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