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Issue 34, 2015
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A–D–A-type S,N-heteropentacene-based hole transport materials for dopant-free perovskite solar cells

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Abstract

This work reports the design and synthesis of acceptor–donor–acceptor (A–D–A) type low band gap hole transport materials (HTM) comprising S,N-heteropentacene central units for solid-state perovskite-based solar cells. The optical and electrochemical properties were tuned by the insertion of thiophene or ethylenedioxythiophene units in the molecular backbone. These HTMs showed strong absorption in the visible region and suitable highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies with respect to the CH3NH3PbI3 perovskite. Mesoscopic solid state perovskite solar cells prepared by solution-processing using these HTMs generated power conversion efficiencies (PCE) of 10.3–11.4% without the use of any additive or dopant. The charge transfer behavior between photoexcited perovskite and the HTMs was further investigated by photo-induced absorption spectroscopy.

Graphical abstract: A–D–A-type S,N-heteropentacene-based hole transport materials for dopant-free perovskite solar cells

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Publication details

The article was received on 28 May 2015, accepted on 22 Jul 2015 and first published on 24 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA03865K
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Citation: J. Mater. Chem. A, 2015,3, 17738-17746
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    A–D–A-type S,N-heteropentacene-based hole transport materials for dopant-free perovskite solar cells

    C. Steck, M. Franckevičius, S. M. Zakeeruddin, A. Mishra, P. Bäuerle and M. Grätzel, J. Mater. Chem. A, 2015, 3, 17738
    DOI: 10.1039/C5TA03865K

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