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Issue 7, 2017
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Molecular engineering of D–A–π–A sensitizers for highly efficient solid-state dye-sensitized solar cells

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Abstract

Two new quinoxaline-based D–A–π–A organic sensitizers AQ309 and AQ310 have been designed and synthesized employing 3,4-ethylenedioxythiophene (EDOT) and cyclopentadithiophene (CPDT) as π-linker units, respectively. The new AQ309 and AQ310 dyes have been applied in all-solid-state dye-sensitized solar cells (ssDSSCs). An impressive record photoelectric conversion efficiency (PCE) of 8.0% for AQ310-based ssDSSCs using Spiro-OMeTAD as the hole transport material (HTM) was obtained under standard AM 1.5 (100 mW cm−2) solar intensity. This clearly outperforms the PCE of the state-of-the-art organic D–π–A dye LEG4-based devices showing a PCE of 7.3% under the same conditions. Moreover, an excellent high PCE of 8.6% was also recorded for AQ310-based devices under 50% solar intensity. Meanwhile, the AQ310-based ssDSSCs showed a much longer electron lifetime according to the transient photovoltage decay measurement, demonstrating lower charge recombination losses in the devices. Photo-induced absorption spectroscopy (PIA) indicated that AQ310 could be more efficiently regenerated by Spiro-OMeTAD. These results show that molecular engineering is a promising strategy to develop D–A–π–A organic sensitizers for highly efficient ssDSSCs.

Graphical abstract: Molecular engineering of D–A–π–A sensitizers for highly efficient solid-state dye-sensitized solar cells

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Publication details

The article was received on 12 Dec 2016, accepted on 03 Jan 2017 and first published on 05 Jan 2017


Article type: Communication
DOI: 10.1039/C6TA10673K
J. Mater. Chem. A, 2017,5, 3157-3166

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    Molecular engineering of D–A–π–A sensitizers for highly efficient solid-state dye-sensitized solar cells

    X. Li, B. Xu, P. Liu, Y. Hu, L. Kloo, J. Hua, L. Sun and H. Tian, J. Mater. Chem. A, 2017, 5, 3157
    DOI: 10.1039/C6TA10673K

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