The Effects of Pt-Doped TiO2 Nanoparticles and Thickness of Semiconducting Layers at Photoanode in the Improved Performance of Dye-Sensitized Solar Cells

Abstract

This work synthesized Pt-doped dye-sensitized solar cells (DSSC) with different molar ratios and thicknesses. The materials were revealed fully through X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The photovoltaic properties of the sample were studied by UV-visible spectroscopy, electrochemical impedance spectroscopy (EIS), and IPEC (incident photon-to-current conversion efficiency) techniques. EIS analysis established the decrease in series resistance at the electrolyte interface. It could be one of the reasons for the increase in electron transfer rate and decrease in the recombination process at the interface. Statistical data obtained from optical and electrical investigations revealed that the electrical power-output efficiency of DSSC was 14.25%. It was found that a high ratio of Pt doping and thinner thickness can promote cell performance, owing to the reduction of series resistance, lower bandgap, and high dye adsorption. Doping TiO2 with Pt reduced its energy bandgap and introduces intermediate energy levels inside TiO2 to facilitate the transition of electrons at low excitation energies. The absorbance of the samples 0.15 M Pt and 0.25 M Pt showed improvement in the wavelength ranging from 200 to 800 nm by Pt doping.

Common Transition Metal Oxide Nanomaterials in Electrochemical Sensors for the Diagnosis of Monoamine Neurotransmitter‐Related Disorders

“…[105] Similarly, doping TiO 2 NPs with Pt was demonstrated to reduce its charge transfer resistance by ~64 %. [106] Similar to every other metal oxide NPs, TiO 2 NPs possess properties that are quite different from that of the bulk TiO 2 . TiO 2 NPs are a nanomaterial of tremendous industrial importance such that it forms a component of everyday household substances such as pigment in paints, cosmetics and food.…”

“…For instance, doping a TiO 2 NP with ~10 wt % Mn has reportedly increased its a lattice parameter by ~5 %, while the corresponding increase in photodegradation efficiency was ~3.5 % [105] . Similarly, doping TiO 2 NPs with Pt was demonstrated to reduce its charge transfer resistance by ~64 % [106] …”