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
Additional Information
Elements: |
W,Se |
Element: |
Tungsten |
Element: |
Selenium |
Formula: |
WSe2 |
Material class: |
MX2 |
Material class: |
Dichalcogen |
Properties: |
Semiconductor |
Properties: |
Excitonic |
Band gap range: |
VIS |
Growth method: |
CVD |
Doping: |
Undoped |
Thin-film type: |
Monolayer |
Substrate: |
Sapphire |
