An InAs/Si heterojunction formed by a wet wafer bonding method with an annealing temperature of 350 °C was investigated by transmission electron microscopy (TEM). InAs and Si were observed to be uniformly bonded without any voids in a 2-µm-long field of view in a bright-field TEM image. A high-resolution TEM image revealed that, between the InAs and Si lattice images, there existed a transition la...
We have improved the efficiency of photoconductive antennas (PCAs) using low-temperature-grown GaAs (LT-GaAs). We found that the physical properties of LT-GaAs photoconductive layers greatly affect the generation and detection characteristics of terahertz (THz) waves. In THz generation, high photoexcited carrier mobility and the presence of a few As clusters in the LT-GaAs are two important factor...
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