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Logical progression: Optoelectronic XOR and INH logic gates based on two light inputs and an electrical output were demonstrated using a nanocrystalline TiO2 dye-sensitized solar cell. The Grätzel-type cell was generated using a ruthenium complex as dye, with reverse injection of electrons at the semiconductor/dye interface (see picture).
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Furtado et al. (2006) studied this question.
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