Spiro[fluorene-9,9′-xanthene]-based hole transporting materials for efficient perovskite solar cells with enhanced stability

Kuan Liu, Yuehan Yao, Jiayu Wang, Lifeng Zhu, Mingli Sun, Baoyi Ren, Linghai Xie, Yanhong Luo, Qingbo Meng, Xiaowei Zhan

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    85 Citations (Scopus)

    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 cm2 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.

    Original languageEnglish
    Pages (from-to)100-110
    Number of pages11
    JournalMaterials Chemistry Frontiers
    Volume1
    Issue number1
    DOIs
    Publication statusPublished - Jan 2017

    ASJC Scopus subject areas

    • General Materials Science
    • Materials Chemistry

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