Spiro[fluorene-9, 9′-xanthene]-based hole transporting materials for efficient perovskite solar cells with enhanced stability. (16th August 2016)

• Record Type: Journal Article
• Authors: Liu, Kuan; Yao, Yuehan; Wang, Jiayu; Zhu, Lifeng; Sun, Mingli; Ren, Baoyi; Xie, Linghai; Luo, Yanhong; Meng, Qingbo; Zhan, Xiaowei
• Is Part Of: Materials chemistry frontiers. Volume 1:Number 1(2017)
• Page Start: 100
• Page End: 110
• Publication Date: 2016-08-16
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c6qm00097e
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : Spiro[fluorene-9, 9′-xanthene]-based hole transporting materials functionalized with four-armed arylamine moieties located at different positions are synthesized for perovskite solar cells. Abstract : Four spiro[fluorene-9, 9′-xanthene] (SFX)-based hole transporting materials (HTMs) functionalized with four-armed arylamine moieties located at different positions are designed and synthesized. These compounds exhibit highest occupied molecular orbital (HOMO) energy levels of −4.9 to −5.1 eV and a hole mobility of 2.2 to 15 × 10 −5 cm 2 V −1 s −1 after doping. Perovskite solar cells (PSCs) based on a methylammonium lead iodide (MAPbI3 ) active layer using one of these HTMs (mp-SFX-2PA) exhibit power conversion efficiencies (PCEs) of up to 16.8%, which is higher than that of the control devices based on benchmark spiro-OMeTAD under the same conditions (15.5%). PSCs based on mp-SFX-2PA exhibit better stability (retain 90% of their initial PCEs after 2000 h storage in an ambient atmosphere) than the control devices based on spiro-OMeTAD (retain only 28% of their initial PCEs). mp-SFX-2PA based devices employing a mixed formamidinium lead iodide (FAPbI3 )/methylammonium lead bromine (MAPbBr3 ) perovskite layer exhibit an improved PCE of 17.7%. The effects of arylamines and their location positions on device performance are discussed.