Third generation photovoltaics
نویسندگان
چکیده
We review recent progress towards increasing solar cell efficiencies beyond the Shockley-Queisser efficiency limit. Four main approaches are highlighted: multi-junction cells, intermediate-band cells, hot carrier cells and spectrum conversion. Multi-junction cells use multiple solar cells that selectively absorb different regions of the solar spectrum. Intermediateband cells use one junction with multiple bandgaps to increase efficiencies. Hot-carrier cells convert the excess energy of abovebandgap photons into electrical energy. Spectrum conversion solar cells convert the incoming polychromatic sunlight into a narrower distribution of photons suited to the bandgap of the solar cell. The AM 1.5 solar spectrum along with the bandgaps of some semiconductors. Third generation photovoltaics strive to maximize the efficiency of converting polychromatic radiation
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