Patent ID: 10181537

Abstract:
A Laser Power Converter (LPC) device (1) comprises an anti-reflection coating (10), a window layer (20), an active region (30), an electron blocking layer (40), a Distributed Bragg Reflector (DBR) (50) and a substrate (60). The device further comprises an anode (70), a cathode (80) and insulating layers (90). The active region (30) is formed of indium gallium arsenide phosphide (InGaAsP), with the proportion of chemical elements in the InGaAsP layers being InyGa1-yAsxP1-x, and is designed to convert electromagnetic radiation having a wavelength of 1.55 μm into electrical energy. However, the exact composition of the InGaAsP is chosen to have a band-gap wavelength at slightly above 1.55 μm because in operation the device heats up and the band-gap shifts to longer wavelengths. To obtain a suitable band-gap the composition may be InyGa1-yAsxP1-x, where x=0.948, 0.957, 0.965, 0.968, 0.972 or 0.976 and y=0.557, 0.553, 0.549, 0.547, 0.545 or 0.544 respectively.