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N3‐Sensitized TiO2/Nb2O5: A Novel Bilayer Structure for Dye‐Sensitized Solar‐Cell Application

A simple and cost‐effective chemical precipitation method for the synthesis of Nb2O5 nanoparticles is reported. The as‐synthesized powder is amorphous and after annealing at 500 °C the crystalline phase is observed, which is then used for the preparation of photoelectrode material sensitized with N3 dye toward dye sensitized solar‐cell application. The effect of Nb2O5 layer over TiO2 by making a bilayer structure for dye‐sensitized solar‐cell application is studied. The device performance is studied using the current density–voltage (J–V) curve as well as by external quantum efficiency measurement (EQE). Furthermore, the behavior of electron in the device is studied by electrochemical impedance spectroscopy (EIS) measurement. It is observed that the amount of dye loading increases with optical reflection for the bilayer structure, which leads to the improvement in JSC along with EQE. The maximum power conversion efficiency obtained for the bilayer structure is 5.26%.