9/9/2023 0 Comments Download laceyerThe files you can download here are for use in DIVA for automatic georeferencing (to assign coordinates to places). Global gridded population databaseĪ gazetteer is a list of place names and their coordinates. Land cover, original data resampled onto a 30 seconds gridĬIESIN, 2000. Seperate files for line and area features The level of subdivision varies between countries The results provide a reference for the CVD preparation of 2D materials and lay the foundation for the fabication of next-generation optoelectronic devices with a wide-wavelength-range response.Select and download free geographic (GIS) data for any country in the worldĬountry outlines and administrative subdivisions for all countries. Furthermore, a high-performance photodetector based on WTe2 is fabricated, which has high responsivity of 118 mA/W (1550 nm) and 408 mA/W (2700 nm ) at room temperature, indicating its great potential for infrared optoelectronic devices. The thickness and lateral dimensions of WTe2 crystals can be effectively tuned by growth temperature and hydrogen concentration, that the dynamic growth mechanism is understood by the combination of surface reaction and mass transport. Here, we propose a salt-assisted double-tube CVD method for the one-step preparation of high-quality and large-scale WTe2 crystals of monolayer and few layers. However, the chemical activity between W and Te is low, and the controllable synthesis of large-size layered WTe2 with stoichiometric ratio is the main challenge for further research. At present, the preparation of WTe2 films mainly depends on the chemical vapor deposition method (CVD) method. WTe2, as a member of Weyl semimetals, is a vital candidate for the development of broad-wavelength-range photodetectors.
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