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An A–D–A′–D–A type small molecule acceptor with a broad absorption spectrum for organic solar cells

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Abstract

Organic molecules with wide absorption spectra exhibit great sunlight harvesting capability and are critically important for solar cell applications. In this manuscript, we develop an A–D–A′–D–A type small molecule acceptor (IID-IC) using isoindigo (IID) as the electron-deficient core unit (A′), thiophene as the electron-rich bridging units (D) and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) as the electron-deficient endcapping groups (A). IID-IC shows a wide absorption spectrum with the full width at half maximum (FWHM) of 190 nm, which is almost twice that of a typical A–D–A type molecule acceptor. The wide absorption spectrum of IID-IC is possibly due to the partially suppressed intramolecular charge transfer effect with the additional electron-deficient core unit. An organic solar cell (OSC) device based on IID-IC exhibits the power conversion efficiency of 2.82% with broad photoresponse from 320 nm to 780 nm.

Graphical abstract: An A–D–A′–D–A type small molecule acceptor with a broad absorption spectrum for organic solar cells

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Publication details

The article was received on 04 Nov 2017, accepted on 06 Dec 2017 and first published on 06 Dec 2017


Article type: Communication
DOI: 10.1039/C7CC08497H
Citation: Chem. Commun., 2018, Advance Article
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    An A–D–A′–D–A type small molecule acceptor with a broad absorption spectrum for organic solar cells

    J. Miao, B. Meng, J. Liu and L. Wang, Chem. Commun., 2018, Advance Article , DOI: 10.1039/C7CC08497H

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