introduction: it seems that improvement in care and new treatment and screening methods along with better control of diabetes mellitus (dm) has led to a change in incidence of diabetic complications, especially diabetic retinopathy .this study was performed to assess the 4 years incidence rate of diabetic retinopathy in patients with type ii diabetes and factors affecting its progression. metho...

The electronic structure and band offsets of blue phosphorus/WSe2 van der Waals (vdW) heterostructure are investigated via performing first-principles calculations. Blue vdW exhibits modulation bandgaps by the applied vertical compressive strain, a large strain more than 23% leads to semiconductor-to-metal transition. is demonstrated have type-II alignment, which promotes spontaneous spatial se...

Inverted strip buried heterostructure lasers have been fabricated. These lasers have threshold currents and quantum efficiencies that are comparable to those of conventional buried heterostructure lasers. The optical mode is confined by a weakly guiding strip loaded waveguide which makes possible operation in the fundamental transverse mode for larger stripe widths than is possible for conventi...

Articles you may be interested in Temperature modulation molecularbeam epitaxy and its application to the growth of periodic index separate confinement heterostructure InGaAs quantumwell lasers Periodic index separate confinement heterostructure InGaAs/AlGaAs multiple quantum well laser grown by organometallic vapor phase epitaxy Appl. Very low threshold single quantum well gradedindex separate...

Two-dimensional van der Waals heterostructures have been widely designed and applied to numerous optoelectronic devices such as photoelectrochemical (PEC)-type photodetectors, water splitting, solar cells. The understanding of the influence band alignment in type-I on photoelectric response remains incomplete yet essential for designing new devices. Herein, two-step physical vapor deposition is...

In this work, we present a first-principles study of quantum transport in tunnel FETs based on van der Waals (vdW) heterostructures transition metal dichalcogenides (TMDs). We focus 1T-HfSe2 and 1T-SnS2 monolayers to construct vertical heterostructure with type-II band alignment. By including dissipative effects due the electron–phonon interaction, show that vdW are highly sensible phonon coupl...

Well-aligned ZnO nanostructures have been intensively studied over the last decade for remarkable physical properties and enormous applications. Here, we describe a one-step fabrication technique to synthesis freestanding ZnO nanorod/graphene/ZnO nanorod double heterostructure. The preparation of the double heterostructure is performed by using thermal chemical vapor deposition (CVD) and prehea...

Novel hierarchical Cd4SiS6/SiO2 based heterostructure nanowire arrays were fabricated on silicon substrates by a one-step thermal evaporation of CdS powder. The as-grown products were characterized using scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. Studies reveal that a typical hierarchical Cd4SiS6/SiO2 heterostructure nanowire is composed of a single c...