Preparation And Performance Of Dye-sensitized/Perovskite Solar Cells Based On Efficient TiO₂ Mesoporous Films

The speed of development of dye-sensitized solar cells are beyond scientists' expectation since the advent of dye-sensitized solar cells.There are three main ways for researchers to optimize dye-sensitized solar cells: improve the photoelectric conversion efficiency,improve the stability and reduce the cost of preparation.This paper mainly focuses on optimizing the titanium dioxide?TiO₂?mesoporous films materials to improve the performance of dye-sensitized solar cells.Anatase structure of TiO₂ nanoparticles with?001?surface exposed and thorn microspheres structure of TiO₂ particles were prepared as the mesoporous materials of dye-sensitized solar cells.The mesoporous materials were optimized by analyzing the optical properties and electrical properties of dye-sensitized solar cells.Finally,ultra-thin mesoporous TiO₂ film was used in perovskite solar cells as electron transport layer.Besides,the mixture of NiO and C paste was used as back electrode to prepare perovskite solar cell with low cost and high stability.In the experiment,the paste of photoanode and back electrode was prepared.Then,the film was formed by a simple doctor-blade method,and the complete battery device was prepared.More results are as follows:?1?Anatase?001?surface exposed truncated octahedral TiO₂ nanoparticles were synthesised with two step hydrothermal method.The morphology and crystal structure was controlled by joining hydrofluoric acid.It is concluded that the?001?surface exposed TiO₂ nanoparticles of anatase structure are more favorable to absorb dye molecules,which can increase the absorption of visible light.Better charge transfer make the efficiency of dye-sensitized solar cells increased from 3.47%to 7.06%.?2?The TiO₂ microspheres were synthesised by one step hydrothermal method.The morphology of TiO₂ microspheres were controlled by adding different quality urea.SEM images were taken to study the formation of microspheres along with the reaction time prolongs.Compared with the standard P25 TiO₂ nanaoparticles,which commonly used as the photoanode,The adsorption capacity for dye of thorn microspheres mesoporous films is better than that of the spherical nanaoparticles.The efficiency of dye-sensitized solar cells can reach 7.13%,which is higher than the cells?6.08%?based spherical TiO₂ mesoporous layer.?3?A low-cost,without hole conductor,perovskite polar cells were prepared using ultra-thin TiO₂ mesoporous layer.As we all know that the thicker TiO₂ mesoporous layer can lead to lower batteryefficiency.In this research only 120 nm thick TiO₂ mesoporous layer was prepared to get the best cell efficiency.In order to solve the problem of high cost of perovskite solar cells.The mixture of NiO nanoparticles and carbon paste was used to replace Spiro-TAD/Ag as the back electrode.NiO can enhance hole injection and prevent electron-hole recombination.The efficiency is up to 13.26%under AM 1.5G conditions when the proportion of NiO nanoparticles to the carbon paste is 1:20.In addition,the cells keep 85% of the initial highest efficiency after 800 hours in ambient atmosphere at room temperature.