Design And Preparation The Electron-transporting Layer For Perovskite Solar Cells

Perovskite solar cells(Perovskite Solar Cell,PSC)attention continued to rise,because it has high conversion efficiency,the preparation process is simple,the cost is relatively low and can be prepared for the advantages of flexible devices,the researchers also found a new hope in the field of solar cell.The electron transport layer is an important part of the battery device,electron transport material refers to the transmission of electron carriers and accept electron carriers of negatively charged material,usually has high absorption coefficient,higher dielectric constant and lower semi conductor material is the exciton binding energy,can avoid the charge accumulation effect on the life of the device that can be used to transport electrons and hole blocking effect.In this paper,the development of low cost and high performance of perovskite type solar cell as the goal,mainly from the aspect of electronic transmission research,electronic transmission layer material production process and explore the photoactive layer of three of developed perovskite solar cell with high performance.Main research contents:First,The optically active layer in perovskite cell is vital layer perovskite solar battery light active layer of thin film thickness,uniformity,crystallinity and surface coverage directly affect the performance of the battery,it has absorbed photons produced electron and hole role in battery.Preparation of perovskite type solar cell photoactive layer has many kinds,mainly classified into four categories,one step solution method,two step solution method,dual source co evaporation method,gas phase assisted solution method,this paper mainly adopts the method of one-step spin coating preparation of optically active layer perovskite solar cell,improve the film quality the optically active layer by annealing time,annealing temperature and control the one-step spin rate,and improve the properties of perovskite solar cell.The experimental results show that the optimal annealing temperature is 105 ℃,the annealing time is 10 min,and the spin coating speed is 4000 rpm,the performance of the device is optimized.Second,The mesoporous layer as a scaffold or porous perovskite layer carrier to perovskite film quality is uniform and compact,higher coverage rate.The porous Ti O2 ordered an important photocatalyst,in ultraviolet light or sunlight,is conducive to the surface of the electron and hole to hole,and the catalyst reaction can produce free radicals,free radicals with strong oxidation,oxidation of organic compounds can be decomposed into most of the inorganic material,which can greatly improve the battery the conversion efficiency.The method of spin coating,water and heat as the preparation process of mesoporous film,the mesoporous layer preparation process was optimized by optimization experiments to determine the mesoporous thin films prepared by spin coating is better,the best spin rate is 4000 rpm,the sintering temperature is 500 ℃,30 minutes.Third,The dense layer in the perovskite solar cell to transmission electron and hole blocking effect,which can avoid the holes and electrons at the interface of the composite,and the dense layer can improve the performance of the battery.There are many kinds of preparation methods for the dense layer of titanium dioxide,which are classified into categories: liquid phase method,gas phase method and solid phase method.The method of coating,the hydrothermal preparation process as a dense layer of thin films,the dense layer preparation process was optimized by optimization experiments to determine the dense layer thin film prepared by coating is better,the best spin rate is 2000 rpm,the sintering temperature is 500℃,sintering time is 30 minutes.The battery efficiency is 16.2%.