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Issue 8, 2016
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Effects of heteroatom substitution in spiro-bifluorene hole transport materials

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Abstract

Three new spirofluorene-based hole transport materials, Spiro-S, Spiro-N, and Spiro-E, are synthesized by replacing the para-methoxy substituent in 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-MeOTAD) with methylsulfanyl, N,N-dimethylamino and ethyl groups. Their properties as hole transport materials in perovskite solar cells are investigated. The impact of replacing the para-methoxy substituent on bulk properties, such as the photophysical properties, HOMO/LUMO energy level, hole extraction properties and morphologies of perovskite thin films are investigated. Their optoelectronic and charge-transport properties and performance in perovskite solar cells are compared with the current benchmarked and structurally-related hole transport material (HTM) Spiro-MeOTAD. Surprisingly, the methylsulfanyl substituted spirofluorene shows the highest power conversion efficiency of 15.92% among the investigated spirofluorenes, which is an over 38% increase in PCE compared with that of Spiro-MeOTAD under similar device fabrication conditions.

Graphical abstract: Effects of heteroatom substitution in spiro-bifluorene hole transport materials

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Publication details

The article was received on 02 Mar 2016, accepted on 01 May 2016 and first published on 03 May 2016


Article type: Edge Article
DOI: 10.1039/C6SC00973E
Citation: Chem. Sci., 2016,7, 5007-5012
  • Open access: Creative Commons BY license
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    Effects of heteroatom substitution in spiro-bifluorene hole transport materials

    Z. Hu, W. Fu, L. Yan, J. Miao, H. Yu, Y. He, O. Goto, H. Meng, H. Chen and W. Huang, Chem. Sci., 2016, 7, 5007
    DOI: 10.1039/C6SC00973E

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