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• n  a cathode that emits electrons when illuminated

• In a vacuum tube, photons of light strike a cesium-antimony photocathode, which in turn gives off high-speed electrons.

News & Articles

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• Hydrogen fuel from sunlight: Researchers make unique semiconductor/catalyst construct
  Researchers have developed a way to interface a molecular hydrogen-producing catalyst with a visible light absorbing semiconductor. With this approach, hydrogen fuel can be produced off a photocathode using sunlight.
  Aug. 29, 2013 - Science Daily
• Hydrogen fuel from sunlight
  ( DOE/Lawrence Berkeley National Laboratory ) Berkeley Lab researchers at the Joint Center for Artificial Photosynthesis have developed a way to interface a molecular hydrogen-producing catalyst with a visible light absorbing semiconductor. With this approach, hydrogen fuel can be produced off a photocathode using sunlight.
  Aug. 29, 2013 - EurekAlert!