Photoelectrochemical Decomposition of Water Utilizing Monolithic Tandem Cells

Shyam S. Kocha, Don Montgomery, Mark W. Peterson, John A. Turner

Research output: Contribution to journalArticlepeer-review

35 Scopus Citations


Photovoltaic tandem cells consisting of a gallium indium phosphide (GaInP2) homojunction grown epitaxially upon a gallium arsenide (GaAs) homojunction, with a GaAs tunnel-diode interconnection were utilized to photoelectrochemically decompose water in a 1 M sulfuric acid electrolyte solution. Using a sol-gel process, a platinum colloid in water was used to modify the illuminated front surface of the device to catalyze the water decomposition process. A unique feature of this device is that the hydrogen and oxygen are co-evolved from the illuminated surface. The exact mechanism of the water decomposition process is not fully understood at this time.

Original languageAmerican English
Pages (from-to)389-397
Number of pages9
JournalSolar Energy Materials and Solar Cells
Issue number3-4
StatePublished - 1998

NREL Publication Number

  • NREL/JA-590-25636


  • Decomposition
  • Monolithic tandem cells


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