Fabrication And Characterization Of Organic-Inorganic Hybrid Solar Cells Based On Perovskite

Problems such as global energy shortage, environment pollution making the clean, harmless, and high efficiency green solar energy the most ideal alternative energy sources. To explore and improve solar cells has become the focus of scientists from all over the world to discuss and research. In recent years, The advent of perovskite solar cells broke people’s perception of traditional thin film solar cells, And the cell efficiency climbs unceasingly. At present, the highest efficiency of perocskite solar cells has broken through 20%. Makes people open the research upsurge of perovskite solar cells while marveling at its high efficiency. However, the study on perovskite solar cells to date is limited to a small range, the internal structure and principle still remain to be explored and discovered. For this reason, this paper expanded the study of perovskite preparation methods and the structure of the cell components and process optimization. And the research progress are as follows:(1) Prepare titanium dioxide compact layer and titanium dioxide mesoporous layer by sol-gel method, by spin coating precursor solution of TiO2 compact layer, dense structure is formed after calcining, and the thickness is approximately 120nm; by spin coating precursor solution of TiO2 mesoporous layer, the TiO2 mesoporous layer with uniform distribution and porous structure is formed after calcining. Thickness is controlled within 180nm to 460nm.(2) Reacts methylamine with hydroiodic acid as raw material to produce CH3NH3I. White CH3NH3I crystal was obtained by rotary evaporation, anhydrous ethanol and anhydrous diethylether were used to purified the primary product by recrystallization. After vacuum drying, pure CH3NH3I crystal was obtained.(3) Perovskite absorption layer generated by two-step method was loaded on the TiO2 mesoporous layer, after the spin-coating of Spiro-MeOTAD, cells were packaged and tested. And made adjustment and optimization to the soaking time while perovskite was formed by two-step method. Along with the increase of soaking time, the thickness of the perovskite layer increased first, then decreased. When the soaking time is too short, Pbl2 reacted incompletely. Through experiment, we know that 60s is the optimized soaking time. Adjust and optimize the thickness of the TiO2 mesoporous layer.When the TiO2 mesoporous layer precursor solution was spin-coated 1、2、3 times, the thickness were 180nm、380nm、460nm respectively. The thickness of the perovskite layer were also increased. Through experiment, when the thickness of TiO2 mesoporous layer is about 380nm, the photoelectric conversion efficiency of the perovskite solar cell is the best, based on the above two optimization conditions, the highest photoelectric conversion efficiency is up to 11.1%.