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Design of cyclopentadithiophene-based small organic molecules as hole selective layers for perovskite solar cells

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Abstract

Thiophene-based p-type molecules are being extensively investigated and employed in optoelectronic devices due to their intriguing semiconducting properties. Herein, we report the synthesis and characterization of a 4H-cyclopenta[1,2-b:5,4-b′]dithiophene-based core, having methoxy-substituted triphenylamine side arms as donor groups. These rationally designed molecules were obtained through easy cross-coupling reactions, in few synthetic and purification steps. The synthesized molecules coded as CDTh 1 and CDTh-EtHex 2 showed excellent thermal stability, and the fabricated perovskite solar cells using CDTh 1 and CDTh-EtHex 2 as hole transporting materials (HTMs) gave competitive performance compared to the state-of-the-art Spiro-OMeTAD. Photoluminescence of perovskite layers coated with these HTMs show relatively high quenching suggesting the injection of holes from the valence band of the perovskite into the HOMO of the HTM. The estimated production cost was calculated and found to be a fraction of that of commercially available state-of-the-art Spiro-OMeTAD.

Graphical abstract: Design of cyclopentadithiophene-based small organic molecules as hole selective layers for perovskite solar cells

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Publication details

The article was received on 08 Mar 2018, accepted on 10 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8SE00119G
Citation: Sustainable Energy Fuels, 2018, Advance Article
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    Design of cyclopentadithiophene-based small organic molecules as hole selective layers for perovskite solar cells

    L. Caliò, S. Kazim, M. Salado, I. Zimmermann, M. K. Nazeeruddin and S. Ahmad, Sustainable Energy Fuels, 2018, Advance Article , DOI: 10.1039/C8SE00119G

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