Patent ID: 6815792
Filing Date: 2004-11-09
Classification: H01L,Y02E

Abstract:
A compound semiconductor multi-layer structure comprising:a compound semiconductor substrate; a compound semiconductor buffer layer formed on the compound semiconductor substrate, the buffer layer being of the same conduction type as the compound semiconductor substrate; an undoped compound semiconductor light-absorbing layer formed on the compound semiconductor buffer layer; and a compound semiconductor cap layer formed on the compound semiconductor light-absorbing layer, the cap layer being of the same conduction type as the compound semiconductor substrate, wherein the compositional proportions of a compound semiconductor constituting the compound semiconductor light-absorbing layer cyclically vary in a thickness direction with respect to predetermined compositional proportions that establish lattice matching between the compound semiconductor and a compound semiconductor constituting the compound semiconductor substrate. 2.The compound semiconductor multi-layer structure of claim 1, wherein the profile of the cyclic variation of the compositional proportions in a thickness direction assumes the form of a sinusoid.