Patent ID: 6552412
Filing Date: 2003-04-22
Classification: H01L,Y10S

Abstract:
A semiconductor device comprising:an n-layer with n-type conduction; a p-layer with p-type conduction; a negative electrode contacting said n-layer; a positive electrode contacting said p-layer and applied with a positive voltge relative to said negative electrode; quantum-wave interference layer units having plural periods of a pair of a first layer and a second layer, said second layer having a wider band gap than said first layer; a middle layer disposed between adjacent two of said quantum-wave interference layer units; and wherein the thickness of said first layer (DW) is equal to nW&lgr;W/4, where nW is an odd number and &lgr;W is a quantum-wave wavelength of carriers injected in the first layer; the thickness of said second layer (DB) is equal to nB&lgr;B/4, where nB is an odd number and &lgr;B is a quantum-wave wavelength of carriers injected in the second layer; the carriers in said first and second layers are selected from the group consisting of electrons and holes, said middle layer does not have a multi-period structure but has a plane structure in a band structure, wherein said quantum-wave interference layer units and the middle layer are connected in series, wherein a kinetic energy of said carriers which determines said quantum-wave wavelength is set at a level near the bottom of a conduction band or a valence band of said second layer, according to the case that said carriers are electrons and holes, respectively, wherein said quantum-wave wavelength &lgr;W in said first layer is equal to h/[2mW(E+V)]Â½, said quantum-wave wavelength &lgr;B in said second layer is equal to h/(2mBE)Â½, where h, mW, mB, E, V, represent Plank's constant, an effective mass of said carrier in said first layer, an effective mass of said carrier in said second layer, a kinetic energy of carriers flowing into said second layer, a potential energy of said second layer to said first layer, respectively.