43% composite split-spectrum concentrator solar cell efficiency
One way of improving photovoltaic efficiency is to subdivide the solar spectrum into small energy ranges and to convert each range with an appropriate bandgap cell. Most implementations use monolithic or mechanical cell stacks, with earlier approaches based on steering different wavelengths to non-stacked cells recently re-explored. The present work extends this by putting measurements on a more rigorous basis and by improving the composite experimental efficiency of selected cells to beyond 43%, the highest reported for photovoltaic conversion.