4-Junction GaAs Based Thin Film Photonic Power Converter with Back Surface Reflector for Medical Applications

Article Energy & Fuels

Experimental coupling process efficiency and benefits of back surface reflectors in photovoltaic multi-junction photonic power converters

Esther Lopez et al.

Summary: This study experimentally quantified the efficiency of luminescence coupling in three-junction photonic power converters based on GaAs/AlGaAs rear hetero-junction subcells. The results showed a coupling process efficiency of 32% +/- 9% from top and middle subcells to the limiting bottom subcell. The observed coupling reduced the current mismatch induced by temperature changes from 4.4% to 1.6% under constant monochromatic illumination. Additionally, the implementation of back surface reflectors in the power converters improved device response at elevated temperatures by redirecting emitted photons towards upper subcells to reinforce luminescence coupling.

PROGRESS IN PHOTOVOLTAICS (2021)

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Article Materials Science, Multidisciplinary

68.9% Efficient GaAs-Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance

Henning Helmers et al.

Summary: For solar cells operating under the broad-band solar spectrum, photovoltaic conversion efficiency is limited by transmission and thermalization losses. Photon recycling can increase effective excess carrier concentration, boosting photovoltage and therefore conversion efficiency.

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS (2021)

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Article Materials Science, Biomaterials