Patent ID: 8895846

Claim:
A photovoltaic device, comprising: a p + -doped AlGaAs layer, wherein recesses are formed in the p + -doped AlGaAs layer such that the recesses extend through the p + -doped AlGaAs layer; and a n-doped GaAs layer directly adjacent to the p + -doped AlGaAs layer, wherein the n-doped GaAs layer and p + -doped AlGaAs layer form a p-n heterojunction such that electric energy is created when light is absorbed by the p-n heterojunction; an interface layer comprising a Group III-V compound semiconductor above the p + -doped AlGaAs layer; a diffuser above the p + -doped AlGaAs layer, wherein the diffuser layer is covered with a reflective layer, wherein the diffuser layer and the interface layer are in direct contact with the p + -doped AlGaAs layer, wherein the diffuser layer is found in direct contact with a first side of the interface layer and in direct contact with a second side of the interface layer, and wherein the recesses in the p + -doped AlGaAs layer extend through the diffuser layer and the reflective layer; window layer below the n-doped GaAs layer, wherein a bottom surface of the p + -doped AlGaAs has been roughed to provide different angles for increased light trapping; and an antireflective coating disposed below the window layer.