Medium wavelength infrared detector with diffused AlxIn/sub 1-x/Sb/InSb quantum-well structure

The subband of Al _xIn _1-xSb/InSb quantum-well structure under the effect of interdiffusion were calculated. The model use the 14-band calculation and the effective Hamiltonian approach. The results show that the interband transition energy is relatively small, compared to quantum well constructed by As based. With a particular Al concentration and design, the interband transition energy at around 200-300 meV. This is the range for medium wavelength infrared region. Hence, we suggest in this paper to use Al _xIn _1-xSb/InSb quantum-well structure for infrared detectors. The effect of interdiffusion shows a shift in interband transitions energy, which is useful for find tunneling the transition energy. When it apply to infrared detector, the absorption wavelength can be tune by interdiffusion to a desire value. In this paper, we propose to use antimonide based interdiffusion quantum well as an infrared detector, and show it wavelength tunability.