Patent ID: 6660928
Filing Date: 2003-12-09
Classification: H01L,Y02E

Abstract:
A triple-junction photovoltaic device comprising:a p-doped substrate comprising GaAs; a p-doped buffer layer deposited on said substrate, where said buffer layer comprises In0.13Ga0.87As; a bottom subcell deposited on said buffer layer, where said bottom subcell includes a p-doped back window layer comprising In0.62Ga0.38P, a p-doped base layer deposited on said back window layer and comprising In0.13Ga0.87As, an n-doped emitter layer deposited on said base layer and comprising In0.13Ga0.87As, and an n-doped front window layer comprising In0.62Ga0.38P; a lower tunnel junction deposited on said bottom subcell, where said lower tunnel junction includes an n-doped lower layer comprising In0.62Ga0.38P, and a p-doped upper layer comprising Al0.09Ga0.91As; a middle subcell deposited on the upper surface of said lower tunnel junction, where said middle subcell includes a p-doped back window layer comprising In0.62Ga0.38P, a p-doped base layer deposited on said back window layer and comprising In0.49Ga0.51As0.23P0.77, an n-doped emitter layer deposited on said base layer and comprising In0.49Ga0.51As0.23P0.77, and an n-doped front window layer comprising Al0.42In0.58P; an upper tunnel junction deposited on said middle subcell, where said upper tunnel junction includes an n-doped lower layer comprising In0.62Ga0.38P, and a p-doped upper layer comprising Al0.09Ga0.91As; a top subcell deposited on the upper surface of said upper tunnel junction, where said top subcell includes a p-doped back window layer comprising Al0.42In0.58P, a p-doped base layer deposited on said back window layer and comprising (In)0.6(Ga0.33Al0.67)0.4P, an n-doped emitter layer deposited on said base layer and comprising (In)0.6(Ga0.33Al0.67)0.4P, and an n-doped front window layer comprising Al0.42In0.58P; and an n-doped cap layer deposited on said top subcell and comprising In0.13Ga0.87As.