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基于藍(lán)寶石襯底的三角形單層二硫化鎢

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  • 公司名稱 上海巨納科技有限公司
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  • 更新時(shí)間 2020/12/27 1:06:41
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Isolated monolayer thickness WS2 are grown onto c-cut (0001) sapphire substrates.

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Isolated monolayer thickness WS2 are grown onto c-cut (0001) sapphire substrates. This particular product contains monolayer thickness WS2 triangular flakes randomly distributed across sapphire substrate. While some regions reach continuity with coalesced WS2 triangles, this sample contains well-separated triangles for advanced spectroscopy, microscopy, and electronic measurements. Synthesized monolayer WS2 triangles are highly luminescent and Raman spectroscopy studies also confirm the monolayer thickness.

 

Sample Properties.

Sample size

1cm x 1cm square shaped

Substrate type

(0001) c-cut sapphire

Coverage

Isolated and partially merged monolayer triangl

Electrical properties

2.0 eV Direct Bandgap Semiconductor

Crystal structure

Hexagonal Phase

Unit cell parameters

a = b = 0.312 nm, c = 1.230 nm, α = β = 90, γ = 120°

Production method

Low pressure Chemical Vapor Deposition (LPCVD)

Characterization methods

Raman, photoluminescence, TEM, EDS

Specifications

1)     Well-separated WS2 domains across c-cut sapphire

2)     One centimeter in size. Larger sizes up to 2-inch wafer-scale available upon requests.

3)     Atomically smooth surface with roughness < 0.2 nm.

4)     Highly uniform surface morphology. WS2 triangles are scattered across sample.

5)     99.9995% purity as determined by nano-SIMS measurements

6)    Repeatable Raman and photoluminescence response

7)     High crystalline quality, Raman response, and photoluminescence emission comparable to single crystalline monolayer flakes.

8)     c-cut Sapphire but our research and development team can transfer WS2 triangles onto variety of substrates including PET, quartz, and SiO2/Si without significant compromising of material quality.

9)    WS2 monolayer triangles do not contain intentional dopants or defects. However, our technical staff can produce defected WS2 using α-bombardment technique.

 

Supporting datasets [for * Full area coverage on SiO2/Si]

 

Transmission electron images (TEM) acquired from CVD grown WS2 (triangular) monolayers on c-cut sapphire confirming highly crystalline nature of monolayers

Energy dispersive X-ray spectroscopy (EDX) characterization on CVD grown full area coverage WS2 on sapphire confirming W:S 1:2 ratios

Room temperature photoluminescence spectroscopy (PL) and Raman spectroscopy (Raman) measurements performed on CVD grown full area coverage MoS2 monolayers on c-cut sapphire. Raman spectroscopy measurement confirm monolayer nature of the CVD grown samples and PL spectrum display sharp and bright PL peak located at 1.85 eV in agreement with the literature.

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