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Silver nanoparticles-incorporated NbO surface passivation layer for efficiency enhancement in dye-sensitized solar cells.

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : J Colloid Interface Sci

Source : J Colloid Interface Sci

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2018

Abstract : Guiding and capturing photons at the nanoscale by means of metal nanoparticles and interfacial engineering for preventing back-electron transfer are well documented techniques for performance enhancement in excitonic solar cells. Drifting from the conventional route, we propose a simple one-step process to integrate both metal nanoparticles and surface passivation layer in the porous photoanode matrix of a dye-sensitized solar cell. Silver nanoparticles and NbO surface passivation layer are simultaneously deposited on the surface of a highly porous nanocrystalline TiO photoanode, facilitating an absorption enhancement in the 465 nm and 570 nm wavelength region and a reduction in back-electron transfer in the fabricated dye-sensitized solar cells together. The TiO photoanodes were prepared by spray pyrolysis deposition method from a colloidal solution of TiO nanoparticles. An impressive 43% enhancement in device performance was accomplished in photoanodes having an Ag-incorporated NbO passivation layer as against a cell without Ag nanoparticles. By introducing this idea, we were able to record two benefits - the metal nanoparticles function as the absorption enhancement agent, and the NbO layer as surface passivation for TiO nanoparticles and as an energy barrier layer for preventing back-electron transfer - in a single step.

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