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

Abstract

Thiophene-based p-type molecules are being extensively investigated and employed in opto-electrical devices due to their intriguing semiconducting properties. Herein, we report the synthesis and characterization of 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 the CDTh 1 and CDTh-EtHex 2 as hole transporting materials (HTMs) gave competitive performance compared to the state-of-the-art Spiro-OMeTAD. Photoluminescence experiments of perovskite layers coated with these HTMs, show relatively high quenching suggesting the injection of hole from the valence band of perovskite into the HOMO of HTM. The estimated production cost was calculated, and found to be a fraction of commercially available state-of-the-art Spiro-OMeTAD.

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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, Accepted Manuscript
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    Design of cyclopentadithiophene-based small organic molecules as hole selective layer for perovskite solar cells

    L. Calio, S. Kazim, M. Salado, I. Zimmermann, M. K. Nazeeruddin and S. Ahmad, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00119G

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