A study of reverse bias in a dye sensitised photoelectrochemical device

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Journal Article
SOLAR ENERGY MATERIALS and SOLAR CELLS, 2003, 76 (2), pp. 175 - 181
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A dye-sensitized nanocrystalline solar subjected to reverse bias of800 mV 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 ofthe photosensitising dye occurred. Spectroelectrochemical experiments revealed that an irreversible loss ofintensity in the metal to ligand charge transfer band at 540nm occurred. In practical terms, these results indicate that cells which are incorrectly connected to an array ofcells or a system failure where potentials greater than 1500mV are present, may be irreversibly damaged.
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