Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 76, Issue 2, Pages 175-181Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-0248(02)00317-3
Keywords
dye-sensitised cell; titanium dioxide; photoelectrochemical cell; Raman spectroscopy; spectroelectrochemistry
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A dye-sensitized nanocrystalline solar subjected to reverse bias of 800mV showed no measurable loss in performance. However, at 2000 mV, a dramatic and irreversible reduction in the cells performance is observed. Raman spectroscopy experiments suggested that no desorption of the photosensitising dye occurred. Spectroelectrochemical experiments revealed that an irreversible loss of intensity in the metal to ligand charge transfer band at 540 nm occurred. In practical terms, these results indicate that cells which are incorrectly connected to an array of cells or a system failure where potentials greater than 1500 mV are present, may be irreversibly damaged. (C) 2002 Elsevier Science B.V. All rights reserved.
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