Abstract
Bismuth triiodide was synthesized hydrothermally and used as sensitizer in sensitized solar cells. Iodine/triiodide aqueous solution was used as electrolyte. The bismuth triiodide and solar cells are characterized by X-ray diffractometer, transmission electron microscopy, electron dispersive spectroscopy, X-ray photoluminescence spectroscopy, current–voltage trances and electrochemical impedance spectroscopy. A power conversion efficiency of 4.37% was achieved on cells with 18-μm thick titanium dioxide photo-anodes. The present study suggests a promising route to an environmentally benign solar cell with “green” sensitizer material of bismuth triiodide and aqueous electrolyte.
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