High-efficiency and low dark current crystalline selenium-based heterojunction photodiode with a high-quality tellurium nucleation layer
In this study, a high-efficiency and low dark current thin-film crystalline selenium (c-Se)/gallium oxide (Ga2O3) heterojunction photodiode is demonstrated via improving the deposition conditions for the tellurium nucleation layer that prevents the peeling of the selenium film during annealing. The highly (100)-oriented polycrystalline selenium film is grown by employing a thin tellurium (Te) nucleation layer with high-quality crystallinity. The device exhibits high external quantum efficiency in the visible region and extremely low dark current that is below 100 pA/cm2 at a reverse-bias voltage of 15 V at room temperature. The result indicates the high potential of crystalline selenium-based photodiodes to be used as photoconversion layers in imaging devices.
Efficient ITO/Se Heterojunction Solar Cells
Indium-tin-oxide (ITO)/selenium heterojunction solar cells with AM 1 conversion efficiencies as high as 3.3% have been fabricated by vacuum deposition. These cells have extremely high spectral response at short wavelengths, resulting in an efficiency of 6.5% under fluorescent light. The photovoltaic performance strongly depends upon the layer thickness of selenium (0.5∼10 µm) and of tellurium (0∼55Å) which is interposed to provide a sufficient mechanical bond between the oxide and selenium layers.
The Application of Using Bezier Curve to Design Turbine Blade
The blade of the turbine is analyzed,the principle and characteristics of the Bezier curve are elaborated,the paper presents a method of using Bezier curve to design turbine blade.It was proved that it's a good and simple way to design turbine blade.Through this way,you can build mathematics model easily.It's certainly had some superiority.