GaSb-based photovoltaic laser-power converter for the wavelength $\lambda\approx$ 1550 nm

The photovoltaic (PV) laser-power converters for the wavelength $\lambda$ = 1550 nm have been produced by diffusion from the gas phase into an $n$-GaSb substrate. PV cells with areas of $S$ = 4, 12.2, and 100 mm$^2$ have been fabricated and tested under a Xe flash lamp. The monochromatic ($\lambda$ = 1550 nm) efficiency $\eta$ = 34.8% is reached on the best samples with $S$ = 12.2 mm$^2$ at a current density of 8 A/cm$^2$. The stability of laser power converter and its degradation rate have been estimated at the operation temperature of 120$^\circ$C.