| Summary: | High-efficiency multijunction laser power converters are demonstrated for low temperature applications with an optical input at 808 nm. The photovoltaic power converting III-V semiconductor devices are designed with GaAs absorbing layers, here with 5 thin subcells (PT5), connected by transparent tunnel junctions. Unprecedented conversion efficiencies of up to 74.7% are measured at temperatures around 150 K. At temperatures around 77 K, a remarkably low bandgap offset value of W<sub>oc</sub> = 71 mV is obtained at an optical input intensity of ~7 W/cm<sup>2</sup>. At 77 K, the PT5 retains an efficiency of 65% with up to 0.3 W of converted output power.
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