| dc.description.abstract | In recent year, perovskite solar cells has developed widely and quickly. In order to commercialize, we use blade-coating method which is more easily to up-scale than the most commonly used spin-coating process to investigate the effect of the precursor solvent, coating temperature, and the ratio of the mixed solvent. We find that there is obvious difference in film thickness and continuity when used distinct single or mixed solvent. The bad absorption of the active layer attributed to the discontinuous film or when the film is too thin, which caused the low device short circuit current. Coating temperature is the key of the roughness of the film. The solvent will keep flowing because of the surface tension after the blade go through when in lower coating temperature, which lead to the uneven morphology. In contrast, when it comes to higher coating temperature, the solvent volatilize so quick that bring about the holes on the film surface, result the lower coverage. Coating temperature is also the main role of the phase change when forming the perovskite crystalline. The precursor react directly into the ordered perovskite crystal at higher coating temperature, the unstable solvate and intermediate are found less. Furthermore, we discuss the film quality of the different solvent ratio of GBL and DMSO. The more DMSO, the larger the crystalline, and also get the better power conversion efficiency when applied to the solar cells. On the contrary, the more GBL, the bigger the density of the nucleus, cause the limited grain size. Due to the characteristic of the solvent GBL, the film is easily form the ring-like surface when the solvent volatilize and emerge the center-to-outer heat convection, which is the reason why the roughness and defects. This study is the analyzation about the above three optimization and got the best coating temperature 130℃ and the best ratio of the solvent GBL: DMSO=1:9(v: v), the n-i-p and p-i-n type solar cells respectively yield 12.16% and 13.19%. After enlarge the active area about 120 times as p-i-n type module with the efficiency of 11.13%. The advantages such as easy-made, material used effectively, and no active area limitation, blade-coating is a very promising process for up-scale manufacture. | en_US |