• RAJ GANESH S PALA

      Articles written in Journal of Chemical Sciences

    • Operating the stacked photoanode at the thickness of exciton diffusion length enhances the efficiency of photoelectrochemical water splitting

      ASHOK KUMAR UMMIREDDI RAJ GANESH S PALA

      More Details Abstract Fulltext PDF

      In photoelectrochemical water splitting, every impinging photon should not only be absorbed butalso be utilized towards reaction. While increasing photoelectrode thickness in photoelectrochemical reactorsfacilitates photon absorption, it has a debilitating effect on efficiency if the thickness required for completephoton absorption is much more than the exciton diffusion length, which is a property determined by thematerial and its processing. To address this issue, we demonstrate a general experimental methodology with astack of cadmium selenide photoanodes wherein the thickness of each photoelectrode is of the order ofexciton diffusion length and which improves overall photocurrent by about 50%.

      Stacked-photo anodes for photoelectrochemical water splitting reaction with each anode having thickness ~ exciton diffusion length. The fraction of light transmitted from the previous anode oxidizes water into O2 and H+. The sum of the thickness of photoanodes is sufficient to absorb all incident light.

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