WS2 - Monolayer Triangles on c-cut Sapphire

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 triangles for advanced spectroscopy, microscopy, and electronic measurements. The triangle sizes show sample to sample variation. Synthesized monolayer WS₂ triangles are highly luminescent and Raman spectroscopy studies also confirm the monolayer thickness. 

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

Specification.

• Identification. Well-separated WS₂ domains 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 < 0.2 nm.
• Uniformity. Highly uniform surface morphology. WS₂ triangles are scattered across 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 WS₂ triangles onto variety of substrates including PET, quartz, and SiO2/Si without significant compromising 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. WS₂ monolayer triangles do not contain intentional dopants or defects. However, our technical staff can produce defected WS₂ using a-bombardment technique.