| dc.description.abstract | In this study, we used solvent-solvent extraction to fabricate perovskite solar cells under atmosphere. Moreover, because the traditional extraction solvent diethyl ether is unsafe and toxic, we choose two low-toxic extraction solvent ethyl acetate and n-heptane to replace it. We not only maintained the performance of the cell with different extraction solvent but also improved the safety of the fabrication process. The fabrication process can realize the application of industry in the future.
However, the cells with ethyl acetate or n-heptane as the extraction solvent had serious instability and defects. Therefore, we mixed ethyl acetate and n-heptane as the extraction solvent. We controlled the supersaturation of the solution during the extraction to change the crystallization process and surface morphology of perovskite. We found the mixed solvent of the ratio of ethyl acetate to n-heptane is 1:1.5 having best stability as the extraction solvent. On the other hand, the rough surface morphology rough could increase interface contact between the perovskite layer and the hole transport layer raised the opportunity of transporting holes.
Finally, the cells with diethyl ether as the extraction solvent had open-circuit voltage (VOC) of 1.06V, short-circuit current density (JSC) of 20.10 mA/cm2, fill factor (FF) of 75.41%, and power conversion efficiency (PCE) of 16.12%. In contrast, the cells with the ratio of ethyl acetate to n-heptane is 1:1.5 as the extraction solvent had VOC of 1.06V, JSC of 20.58mA/cm2, FF of 73.16%, and PCE of 15.99%.All in all, the performance of the cells with mixed solvent as extraction solvent was similar to diethyl ether, and an enhancement of JSC was obtained. | en_US |