Journal article

Fabrication of n-p junction electrodes made of n-type SnO2 and p-type NiO for control of charge recombination in dye sensitized solar cells

J Bandara, CM Divarathne, SD Nanayakkara

Solar Energy Materials and Solar Cells | Published : 2004

Abstract

The n-p junction electrode fabricated coating nanocrystalline SnO 2 thin film with a thin layer of p-type NiO was found to increase the sensitized photocurrent and photovoltage. In addition, increase in the fill factor was noticed due to inhibition of electron back transfer from SnO 2 to the redox electrolyte (I3-) by both junction effect and presence of NiO barrier, resulting in much better energy conversion efficiencies. The highest cell efficiency was obtained for the cell fabricated by immersing SnO2 thin films in soluble Ni salts, and converting them to NiO by firing. The optimum NiO coating thickness was found to be only a few angstroms and the energy levels of the excited dye and the ..

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