In this paper, a quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced. Multi quantu...In this paper, a quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced. Multi quantum wells structures based on III-Nitride materials due to their large band gaps are used. In order to calculate the photodetector parameters, wave functions and energy levels are obtained by solving 1-D Schrodinger–Poisson equation self consistently at 80 ?K. Responsivity values are about 22 mA/W and 18.75 mA/W for detecting of 1.33 μm and 1.55 μm wavelengths, respectively. Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm wavelengths, respectively.展开更多
The demand for green energy is growing these days as a result of the world energy crisis,as well as global warm-ing.Solar cells are in great interest due to the fact that solar energy can be easily converted to electr...The demand for green energy is growing these days as a result of the world energy crisis,as well as global warm-ing.Solar cells are in great interest due to the fact that solar energy can be easily converted to electricity,if the photovoltaic cell’s cost can be lowered.One of the methods to make low-cost energy is using Luminescent solar concentrators.They have the advantage of directly integrating solar cells to dense urban areas as well as skyscrapers.Different materials and waveguide sizes have been investigated for use in luminescent solar concen-trators.However,the optimized waveguide geometry and quantum dots concentrators have not been thoroughly studied.In this paper,we have simulated graphene quantum dots using density function theory.A Monte-Carlo ray-tracing simulation was developed to model our device.We have optimized the luminescent solar concentrator geometry by Monte-Carlo simulation.The optimization results show a 99%enhancement in the energy flux gain of the final device.Besides,we have calculated and analyzed the fate of all photons.展开更多
文摘In this paper, a quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced. Multi quantum wells structures based on III-Nitride materials due to their large band gaps are used. In order to calculate the photodetector parameters, wave functions and energy levels are obtained by solving 1-D Schrodinger–Poisson equation self consistently at 80 ?K. Responsivity values are about 22 mA/W and 18.75 mA/W for detecting of 1.33 μm and 1.55 μm wavelengths, respectively. Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm wavelengths, respectively.
文摘The demand for green energy is growing these days as a result of the world energy crisis,as well as global warm-ing.Solar cells are in great interest due to the fact that solar energy can be easily converted to electricity,if the photovoltaic cell’s cost can be lowered.One of the methods to make low-cost energy is using Luminescent solar concentrators.They have the advantage of directly integrating solar cells to dense urban areas as well as skyscrapers.Different materials and waveguide sizes have been investigated for use in luminescent solar concen-trators.However,the optimized waveguide geometry and quantum dots concentrators have not been thoroughly studied.In this paper,we have simulated graphene quantum dots using density function theory.A Monte-Carlo ray-tracing simulation was developed to model our device.We have optimized the luminescent solar concentrator geometry by Monte-Carlo simulation.The optimization results show a 99%enhancement in the energy flux gain of the final device.Besides,we have calculated and analyzed the fate of all photons.
