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Optical and electronic properties of single modulation doped GaAs/AlGaAs v-grooved quantum wire modified by ion implantation

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Science China(Physics,Mechanics & Astronomy) 2005年第3期48卷 361-370页

作者： HUANG Shaohua CHEN Zhanghai BAI Lihui WANG Fangzhen SHEN Xuechu Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China

Single GaAs/Al0.5Ga0.5As v-grooved quantum wire modified by selective ion-implantation and rapid thermally annealing was investigated by spatially-resolved microphotoluminescence and magneto-resistance measurement. Spatially-resolved photoluminescence results indicate that the ion-implantation induced quantum well intermixing raises significantly the electron subband energies of the side quantum wells and vertical quantum wells, and more efficient accumulation of electrons in the quantum wires is achieved. Furthermore, the polarization properties of the photoluminescence from the quantum wires show large linear polarization degree up to 63%. Magneto- transport investigation on the ion implanted quantum wire samples presents the quasi-one dimensional intrinsic motion of electrons, which is important for the design and optimization of one dimensional electronic devices.

关键词： GaAs/AlGaAs v-grooved quantum wire, ion-implantation, photoluminescence, polarization,magneto-resistance

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Numerical Investigation Thermal Performance of Solar Air Heater Using Different Angle v-grooved of Corrugated Absorber Plate

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 227-243页

作者： Ayad S.Abedalh Sohaib Hassan Mohammed Engineering Technical College of Mosul Northern Technical UniversityMosul41001Iraq

Solar energy,a renewable resource,can be harnessed instead of fossil fuels to generate power and *** effective method for converting solar energy into heat is through a solar air heating(SAH)*** theoretical investigation focused on the thermal performance of various v-groove angles on a corrugated absorber *** researchers maintained the exterior dimensions and constraints of the absorber plate while increasing its surface area by using a corrugated absorber *** the simulation,three different v-groove angles were employed:45°,30°,and 15°.The temperature and air flow rate into the system had been set at 30℃ and 0.15 m/s,respectively four various solar radiation intensities have been examined for each of the *** governing equations associated with the standard design,including the turbulent kinetic energy(k)and dissipation rates model(ε),were solved using the ANSYS 2020 R2 *** results indicated that Utilizing corrugated absorber plates resulted in a rise in the Nusselt number.,surpassing the performance of flat plate *** the different configurations,the v-grooved 45°plate demonstrated the best results under the same ***,it was observed that the efficiency values improved with increasing solar *** investigation also showed that the employing of v-grooved 45°,v-grooved 30°,and v-grooved 15°absorbers led to efficiency improvements of about 20.8%,26.3%,and 36.14%,respectively,when compared to a flat plate at a solar irradiation of 900 W/m2.

关键词： v-grooved different angles absorber plate Nusselt number

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