The Synthesis And Photoelectrochemical Properties Of Anode Material For Dye-sensitized Solar Cells

As a key ingredient in dye-sensitized solar cells (DSSCs), the photoanode films where dye adsorption and electron transfer happened have significant influence on cell performance of DSSCs.Optimize the structure of materials can improve the photovoltaic performances of the DSCs. In this paper, flame spray pyrolysisis applied in this work, by optimizing the flame temperature field, effectively realized the core-shell type structure and the impurity ions nanoparticles doped nano powder.Titanium oxide/tin oxide core-shell structure, zinc oxide/tin oxide core-shell structure and tantalum doping titanium dioxide were synthesis in this work.Diverse nanostructures even well-defined heterostructures have been prepared in such short flame reaction duration by optimizing the flame spray process, such as core/shell structure, wire, rod, cube, hollow sphere and so on.SnO2was firstly deposited epitaxially on TiO2nanocrystals to form TSN with the diameter of60nm by using a flame spray pyrolysis (FSP).The effect of the reaction temperature, residence time and the feeding modes also were studied. At the advantage of epitaxial growth of heterogeneous interface, the nanoparticles were used as anode material. The experimental results indicated the structure could significantly improve the efficiency of photoelectron injection and transmission, suppress the electrons combination between electrons and dye, and finally improve the short-circuit current, yielded a high power conversion efficiency of7.87%, compared with TiO2and SnO2-based cell, significantly better than those of the TiO2-, and SnO2-DSCs devices, due to the decreased charge recombination losses and improved electron transport.SnO2was coated ZnO to form ZSN with the diameter of60-80nmby using FSP. Compared with ZnO, ZSN has good chmical stabilitu and electronic transmission rate. The experimental results indicated the structure could significantly avoid the reaction between dye and ZnO to form abnormal reunion, at the same time, improved the ability of electron injection. The fabricated ZSN-device yielded a power conversion efficiency of2.96%. significantly better than that of the ZnO-DSCs devices.The Ta-doped TiO2with the mixed phase of anatase and rutile was systhesised by using FSP. The experimental results indicated the introduction of tantalum increased the electron concentration with the formation of Ti3+in the host for charge compensation. Besides, Ta doping can restrict the recombination of carries and improve the short circuit current. Results show that the generated oxygen vacancy defects made the Fermi leve shifted, and the enhanced electron injection has obvirously improved the photoelectric conversion efficiency (8.66%).