Study On The Printing Process Of Mesoporous Layer For Printable Mesoscopic Perovskite Solar Cells

In recent years,perovskite Solar Cells have developed rapidly,and the current highest photoelectric conversion efficiency of lab cell has reached to 23.7%,which exhibits broad prospects for commerce.Among device structures of perovskite solar cell,the device based on TiO₂/ZrO₂/C triple mesoporous layers which can be fabricated through printing technique（refered as“printable mesoscopic perovskite solar cell”in the later）has attracted much attention due to the properties of simplified structure and low cost for manufactural material.The mesoporous layers of printable mesoscopic perovskite solar cell are deposited through screen printing and the film thickness of mesoporous layers is usually controlled in 0.5-3μm.The main contents of this thesis which about print technique of printable mesoscopic perovskite solar cell include three parts as follows:Firstly,we focus on the measurement of printed film thickness and studying of the integral film thickness homogeneity.In terms of the bulge exists in the edge of printed mesoporous film,we define the altitude difference between smooth area of film and substrate as film thickness.The TiO₂mesoporous film is deposited on the 10 cm×10 cm substrate and different regions（up to81 points）are choosed to compare and analyse the printed film thickness.Secondly,mainly through controlling solid content and viscosity of paste,print technique parameters such as print speed,pressure and gap,the TiO₂ mesoporous films thickness is adjustable in 400-800 nm and the ZrO₂ mesoporous films thickness is adjustable in 2-3μm.Thirdly,we focus on TiO₂ and ZrO₂ mesoporous film thickness’s influence on device performance.After optimization of TiO₂ and ZrO₂ mesoporous film thickness,large area device（substrate area 100 cm²）whose photoelectric conversion efficiency approaches 12%is achieved.In this thesis we provide technical reference to improve process and performance of device through studying on screen printing technique for printable mesoscopic perovskite solar cell.