| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 104 === The objective of this paper is to improve cell performance of Perovskite solar cells by using mixed non-solvents dripping on the active layer. Three different non-solvents, i.e., toluene, chlorobenzene or dichlorobenzene were commonly used for solvent engineering. However, toluene can remove excess solvents and quickly form intermediate phase. On the other hand, the use of dichlorobenzene or chlorobenzene to wash the film to make the phase transformation can skip formation of large-scale Perovskite-DMSO intermediate and directly form Perovskite crystallites. The chlorobenzene has faster evaporation rate as compared with dichlorobenzene, However rapid crystallization process increases crytal growth rate, which leads to formation of big size crytals. In the current work, different proportions of toluene mixed with chlorobenzene or dichlorobenzene are used to wash the film. By this way we can observe the intermediate phase mix Perovskite phase and improve cells properties.
The photovoltaic properties of the devices show that the efficiency of PSCs fabricated by mixed solvents engineering can improve fill factor and current density compare with single solvent, especially 70 and 90 vol% toluene mixed with chlorobenzene has obvious improve. Fill factor promots from 0.69 to 0.73, and can reduce series resistance, current density increase from 15.65 mA cm^(-2) to 17.02 mA cm^(-2), final efficiency can be improve by mixed solvents engineering.
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