Preparation And Properties Research On Nano-Tin Oxide Electron Transport Layer In Perovskite Solar Cells

Organometal trihalide perovskite solar cells have significant influence on improving chinese energy structure and reducing environmental pollution,attributed to their low cost,low-power consumption,flexibility and high efficiency.This dissertation contains electron transport layer?ETL?design,optimization process and upgrading interface engineering of perovskite solar cells.The electron transport layer acts as a compact layer for transporting electrons and blocking holes,which have critical effects on the performance of perovskite solar cells.Preparing the electron transport films with good crystallization and high quality in low temperature would enhance the photoelectric conversion efficiency of perovskite solar cells for large-scale industrial production.There are two sections in this dissertation.?1?ZnO@SnO₂ nanorods with a core-shell arrays were fabricated by electrochemical and spin-coating methods.SnO₂ thin films as passivation layers improved the thermal stability of CH3NH3PbI3 perovskite layers.Optimizing the preparation process and adjusting the interface of the cells,the photoelectric conversion efficiency of the perovskite solar cells were significantly increased from6.92% to 12.17% and reduced hysteresis loop in J-V measurement.?2?The homogeneous and high crystallized SnO₂ nanocrystals are synthesized by chemical emulsion method.The tin oxide electron transport films are highly crystalline and compact by spin-coating process in low temperature?100°C?,which effectively suppressed the recombination of electrons and holes and improved the efficency of devices.The maximum photoelectric conversion efficiency of perovskite solar cells based on SnO₂ electron transport layer was 12.10%,which was higher than7.16% of low-temperatured TiO₂-based solar cell.