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Importance of terminated groups in 9,9-bis(4-methoxyphenyl)-substituted fluorene-based hole transport materials for highly efficient organic–inorganic hybrid and all-inorganic perovskite solar cells

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Abstract

Hole-transport materials (HTMs) play a crucial role in determining the photovoltaic performance and long-term stability of perovskite solar cells (PSCs), because they not only efficiently facilitate hole-extraction and transfer, but also act as a barrier to protect the perovskite from moisture and oxygen. So far, the power conversion efficiencies (PCEs) over 20% in PSCs have been mostly achieved by employing a Spiro-OMeTAD-based HTM. However, it suffers from some drawbacks such as relatively low hole-mobility, complicated synthesis and difficult purification, which hamper its potential commercial applications. Here, for the first time, two new easily accessible 9,9-bis(4-methoxyphenyl)-substituted fluorene-based HTMs comprising H (YT1) and methoxyphenyl-fluorene (YT3) as the terminated groups have been synthesized for use in organic–inorganic hybrid and all-inorganic PSCs. The (FAPbI3)0.85(MAPbBr3)0.15 and CsPbI2Br PSCs based on YT3 yield very impressive PCEs of 20.23% and 13.36%, respectively, both of which are higher than that of Spiro-OMeTAD (19.18% and 12.30%). More encouragingly, the YT3-based PSC displays good long-term stability for 600 hours. These results confirm that different terminated groups in HTMs show a significant effect on the energy levels, hole extraction and transfer, thin-film surface morphology and photovoltaic performance. Our findings could provide a useful insight for future rational design of HTMs for highly efficient and stable PSCs.

Graphical abstract: Importance of terminated groups in 9,9-bis(4-methoxyphenyl)-substituted fluorene-based hole transport materials for highly efficient organic–inorganic hybrid and all-inorganic perovskite solar cells

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Publication details

The article was received on 07 Feb 2019, accepted on 22 Mar 2019 and first published on 25 Mar 2019


Article type: Paper
DOI: 10.1039/C9TA01452G
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Importance of terminated groups in 9,9-bis(4-methoxyphenyl)-substituted fluorene-based hole transport materials for highly efficient organic–inorganic hybrid and all-inorganic perovskite solar cells

    D. Zhang, T. Wu‡, P. Xu, Y. Ou, A. Sun, H. Ma, B. Cui, H. Sun, L. Ding and Y. Hua, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA01452G

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