An Additive of Sulfonic Lithium Salt for High‐Performance Perovskite Solar Cells. Issue 43 (23rd November 2018)

• Record Type: Journal Article
• Authors: Luo, Hui; Wu, Jihuai; Liu, Quanzhen; Zhang, Mingjing; Yuan, Pengqiang; Huang, Miaoliang
• Is Part Of: ChemistrySelect. Volume 3:Issue 43(2018)
• Page Start: 12320
• Page End: 12324
• Publication Date: 2018-11-23
• Subjects: Additive -- Crystallinity -- Lithium bis(trifluoromethanesulfonyl)imide -- Perovskite solar cell; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201802109
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The perovskite layer has an important influence on the photovoltaic performances of perovskite solar cells (PSCs). In order to improve the morphology and crystallinity of the perovskite film, the additive of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is introduced in the perovskite precursor solution. And the perovskite solar cell with architecture of FTO/compact TiO2 /mesoporous TiO2 /CH3 NH3 PbI3 /spiro‐OMeTAD/Au is fabricated. By optimizing the concentration of LiTFSI, the fabricated PSC shows the best power conversion efficiency of 17.30% with a fixed device area of 1.5×1.5 cm 2 under one sun illumination, while the device without LiTFSI introduction has an efficiency of 15.53% at the same test condition. The morphology observation and photoelectrical characterization demonstrate that the significant improvement of the device performance results from the charge carrier's fast transportation and less recombination for larger grain sizes and fewer grain boundaries by doping LiTFSI into perovskite precursor solution. Abstract : Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as an effective additive is introduced into the crystal growth of perovskite film, which improve the morphology and crystallization of perovskite layers via forming intermediate complex. By optimizing the concentration of LiTFSI, the fabricated PSC shows the best power conversion efficiency of 17.30%, while the device without LiTFSI addition has an efficiency of 15.53% at the same test condition.