Abstract
Nanocrystalline titanium dioxide (TiO 2 ) photoanodes with four different film thicknesses from 5.57μm to 20.65μm were prepared by doctor-blade technique. Performance of dye sensitized solar cells (DSSCs) fabricated with these photoanodes were studied using current-voltage characteristics and incident photon-to-current conversion efficiency (IPCE) measurements. Electrochemical impedance spectroscopy (EIS) was used to analyze the effect of TiO 2 film thickness on the charge transfer resistance and electron life time in the solar cells. Voltage decay measurements were used to study the recombination process of photo generated charge carriers. These studies revealed that the photovoltaic properties of DSSCs largely depend on the film thickness of TiO 2 photoanode. Further, the DSSCs fabricated using a TiO 2 film of 12.73 μm thickness exhibited the best photovoltaic performance with highest incident photon-to-current conversion efficiency, highest short-circuit photocurrent, lowest charge transfer resistance, highest electron life time and lowest recombination life time.
Highlights
Nanocrystalline titanium dioxide (TiO2), well known as a metal oxide semiconductor, has been extensively studied for many applications due to their unique physiochemical properties such as surface area, crystalline structure, grain size, grain boundary density and energy band gap
Performance of dye sensitized solar cells (DSSCs) fabricated with these photoanodes were studied using current-voltage characteristics and incident photon-to-current conversion efficiency (IPCE) measurements
These properties will significantly affect the performance of energy conversion devices fabricated with TiO2 such as dye sensitized solar cells (DSSCs) (Choi et al, 2010; Xin et al, 2012)
Summary
Nanocrystalline titanium dioxide (TiO2), well known as a metal oxide semiconductor, has been extensively studied for many applications due to their unique physiochemical properties such as surface area, crystalline structure, grain size, grain boundary density and energy band gap. Performance of dye sensitized solar cells (DSSCs) fabricated with these photoanodes were studied using current-voltage characteristics and incident photon-to-current conversion efficiency (IPCE) measurements.
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