A novel photodiode made of hybrid organic/inorganic nanocomposite

Novel hybrid organic/inorganic nanocomposites made of metal oxide and conjugated polymer nanocomposite and its application in bulk-heterojunction solar cells were studied. The composite was composed of different concentrations of strontium titanate (SrTiO 3 ) and polyaniline doped phosphoric acid. The optimum concentration of strontium titanate was found to be 0.2 v/v. An inorganic–organic photovoltaic device with a structure of Ag/Pani–H 3 PO 4 –SrTiO 3 /Al has been fabricated. The ideality factor value of the diode was found to be 1.8. This n value of the diode implies a deviation from ideal junction behaviour. The barrier height ϕ b value for the diode was found to be 0.56 eV. The Ag/Pani–H 3 PO 4 –SrTiO 3 /Al diode shows a photovoltaic behaviour with a maximum open-circuit voltage V oc of 2.49 V, and short-circuit current I sc of 5.6 mA under light illumination λ = 460 nm. The conversion efficiency was found to be 5.2%. It is evaluated that the Ag/Pani–H 3 PO 4 –SrTiO 3 /Al diode is a good photodiode with calculated electronic parameters.