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

66 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

  • Materials Science(all)
  • Materials Chemistry

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