Heating Up Solar Power

  • Author: ChemistryViews
  • Published: 08 August 2010
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Stanford University/Nature Materials
thumbnail image: Heating Up Solar Power

Generation of electricity from solar power either uses the thermal energy to power a heat engine or the energy of each photon to initiate a redox reaction in a photovoltaic cell.

Photon enhanced thermionic emission (PETE), the solar converter developed by Nicholas Melosh and colleagues, Stanford University, USA, combines the two approaches to create a photovoltaic cell that can power a secondary thermal engine with its waste heat. Current photovoltaic cells only operate at temperatures too low to do this.

Measurements from gallium nitride show strong evidence for photon-enhanced thermionic emission. Coating a GaN semiconductor with a thin layer of cesium could allow the device to operate at temperatures exceeding 200 °C with theoretical conversion efficiencies above 50 %.

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