Photoelectrochemical Cells

  • Kasturi Lal Chopra
  • Suhit Ranjan Das


The change in the electrode potential (on open circuit) or in the current flowing in the external circuit (under short-circuit conditions) of an electrode/electrolyte system on irradiation is termed a photoelectrochemical effect.(1) Photoelectrochemical (PEC) cells employing a semiconductor/electrolyte junction have gained popularity in recent years for solar energy conversion in view of some potential advantages over conventional solid state solar cells. These are: (i) PEC devices can both store energy in the form of conventional fuels and convert light directly to electrical energy. (ii) The devices can be fabricated easily and the band-bending characteristics of the semiconductor can be suitably modified by proper choice of electrolyte and cell variables. (iii) Problems associated with differential thermal expansion of solid-solid junctions are not present. (iv) Capability for in situ storage exists. (v) It is possible to fabricate hybrid (photovoltaic and photothermal) systems.


Fermi Level Redox Couple Minority Carrier Redox System Valence Band Edge 
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Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • Kasturi Lal Chopra
    • 1
  • Suhit Ranjan Das
    • 2
  1. 1.Indian Institute of TechnologyNew DelhiIndia
  2. 2.National Research CouncilOttawaCanada

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