68.9% Efficient GaAs‐Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance. Issue 7 (10th July 2021) - Helmers, Henning
Abstract : A thin‐film GaAs/AlGaAs rear‐heterojunction photonic power converter with a back reflector is presented by Henning Helmers and co‐workers in article number 2100113 . Photon recycling is leveraged to increase the excess carrier density and consequently the output voltage. Optical resonance yields highest absorptance for near‐bandgap photons. Thereby thermalization losses are minimized without compromising minimal transmission. A photovoltaic conversion efficiency of 68.9% for 858 nm monochromatic light is demonstrated.