Impact of concentration of DMF and H2O on photovoltaic properties of SnO2-based planar perovskite solar cells. (10th March 2023)

• Record Type: Journal Article
• Authors: Shi, Min; Bai, Tiancheng; Du, Shushu; Sha, Huimin; Chen, Hao; Ma, Xiaohu; Xu, Yudong; Chen, Yiqing
• Is Part Of: Electrochimica acta. Volume 444(2023)
• Publication Date: 2023-03-10
• Subjects: SnO2 film -- Electron transport layers -- Perovskite solar cells -- Power conversion efficiency; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2023.141985
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: The synergistic effect of H2 O and DMF contribute to fabricated high quality porous ETLs. Performance of ambient air processed devices enhances from 17.14 to 19.07%, and VOC improved from 1090 to 1128 mV. Unencapsulated device maintains ∼90% of the initial efficiency for 30 days. Abstract: SnO2 -based planar perovskite solar cells were prepared via the sol-gel method and DMF was used to coordinate with SnCl4 which ensures to form a stable Sn-sol. A certain amount of H2 O was added to induce SnCl4 to convert to SnO2 and reduce the remaining of OH − and Cl − on the surface of SnO2 film. Compared with the PCE of pristine SnO2 -based cells (17.14%), the W-SnO2 -based cell in revers scan under simulated AM1.5G illumination increases to 19.07%. The open-circuit voltage of the W-SnO2 -based cells increases to 1128 mV, compared with that of the pristine SnO2 -based cell (1090 mV). The unencapsulated cells maintain 90% of initial efficiency after stored in Ar glovebox for 30 days. Graphical abstract: Image, graphical abstract In this work, we added H2 O to DMF to dissolve SnCl4, this mixed stability solvent is easily to form homogeneous SnO2 film by spin-coating method. Compare to pristine SnO2 prepared by SnCl4 in DMF, the power conversion efficiency of cells based on the optimized SnO2 film was improved the from 17.14% to 19.07%.