CVD-WSe2单层薄膜（进口）-CVD-WSe2单层薄膜（进口）-南京牧科纳米科技有限公司

样品照片：

HRTEM:

Raman和PL光谱:

Description:

This product contains full area coverage WSe2 monolayers on c-cut sapphire substrates. Sample size measures 1cm in size and the entire sample surface contains monolayer thick WSe2 sheet. Synthesized full area coverage monolayer WSe2 is highly luminescent and Raman spectroscopy studies also confirm the monolayer thickness (please see the technical specifications)

Growth method: Our company synthesizes these monolayers using chemical vapor deposition (CVD) using highest purity (6N) gases and precursors in semiconductor grade facilities to produce crystalline and large domain size samples (1-50um). This is unlike commonly used MOCVD process wherein defects are very very large and domain sizes are small (10nm-500nm). Our samples are always highly luminescent and highly crystallized

Sample Properties

Sample size	1cm x 1cm square shaped
Substrate type	(0001) c-cut sapphire
Coverage	Full coverage monolayer
Electrical properties	1.62 eV Direct Bandgap Semiconductor
Crystal structure	Hexagonal Phase
Unit cell parameters	a = b = 0.327 nm, c = 1.295 nm, α = β = 90°, γ = 120°
Production method	Low pressure Chemical Vapor Deposition (LPCVD)
Characterization methods	Raman, photoluminescence, TEM, EDS

Specifications

Identification. Full coverage 100% monolayer WSe2 uniformly covered across c-cut sapphire
Physical dimensions. one centimeter in size. Larger sizes up to 2-inch wafer-scale available upon requests.
Smoothness. Atomically smooth surface with roughness < 0.15 nm.
Uniformity. Highly uniform surface morphology. WSe2 monolayers uniformly cover across the sample.
Purity. 99.9995% purity as determined by nano-SIMS measurements
Reliability. Repeatable Raman and photoluminescence response
Crystallinity. High crystalline quality, Raman response, and photoluminescence emission comparable to single crystalline monolayer flakes.
Substrate. c-cut Sapphire but our research and development team can transfer WSe2 monolayers onto variety of substrates including PET, quartz, and SiO2/Si without significant compromisation of material quality.
Support. 2Dsemiconductors USA is an American owned, regulated, and operated company. Our customers are well-protected by international as well as strict American customer laws and regulations. We give full technical support and guarantee your satisfaction with our well-established customer
Defect profile. WSe2 monolayers do not contain intentional dopants or defects. However, our technical staff can produce defected WSe2 using a-bombardment technique.

Publications:

Enabling valley selective exciton scattering in monolayer WSe2 through upconversion, Nature Communications, 8,14927 (2017)
doi:10.1038/ncomms14927