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دسته بندی:
برق الکترونیک - Power Electronics
سال انتشار:
2021
عنوان انگلیسی مقاله:
Layer number dependent optical and electrical properties of CVD grown two-dimensional anisotropic WS2
ترجمه فارسی عنوان مقاله:
خواص نوری و الکتریکی وابسته به تعداد لایه WS2 ناهمسانگرد دوبعدی رشد CVD
منبع:
ScienceDirect- Elsevier- Surfaces and Interfaces, 26 (2021) 101308: doi:10:1016/j:surfin:2021:101308
نویسنده:
Deepa Thakur
چکیده انگلیسی:
Engineering 2D transition metal dichalcogenides with precise control over layer number enable tuning of
exciting optical and electrical properties at the nanoscale level. We report controlled one-step chemical vapour
deposition growth of WS2 monolayer, bilayer, and trilayer for large scale manufacturing and demonstrate layer
dependent changes in their work function, photoluminescence, and electrical conductivity. Raman, photoluminescence, and fluorescence imaging revealed that the base WS2 monolayer contains alternating triangular
domains with different emission properties. It is observed that bilayer and trilayer grow selectively on less
luminescent facet leading to fan-like morphology for second and third layers. We have systematically demonstrated that desired growth and areal coverage of bilayer and trilayer can be achieved by controlling WO3
precursor content. Kelvin probe force microscopic studies suggest a higher work function of thicker layers as
compared to the monolayer. It was found that work function increases by 0.04 eV when thickness increases from
monolayer to bilayer. FET device measurement on mono and bilayer shows n-type characteristics and two-fold
higher photo-current in monolayer in comparison to the bilayer. The studied thickness dependence of the work
function of WS2 is vital to the fabrication of metal contacts for WS2 based electronic and optoelectronic devices.
Keywords: CVD growth | 2D materials | PL segmentation | Optoelectronics | Transition metal dichalcogenides | KPFM
قیمت: رایگان
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