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Benzothiadiazole-triphenylamine as efficient exciton blocking layer in small molecule based organic solar cells

Abstract

We have designed a small molecule based on benzothiadiazole-triphenylamine (BTD-TPA2), encompasses of an electron-poor benzothiadiazole core with two electron-rich triphenylamine arms. BTD-TPA2 was synthesized in a facile manner using Suzuki cross-coupling reaction. The molecule was rationally designed to take advantage from the synergistic effect of BTD, which allows the formation of a favorable band gap material, while triphenylamine (TPA) moieties will favour efficient hole extraction and transport properties. A thin layer of BTD-TPA2 was placed between the photo-active DBP/C70 layer stack and the MoOx electrical contact. With an optimized interlayer thickness of 35 nm, the attained photovoltaic properties were substantially higher than those of the reference devices. This has its origin in BTD-TPA2’s dual functionality i.e. efficient exciton blocking and improved hole extraction at the anode contact. The obtained results led to an improved power conversion efficiencey of 5.66% for a vacuum deposited bilayer DBP/C70 solar cell, which will be new state-of-the-art for bilayer DBP based solar cells.

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Publication details

The article was received on 31 May 2018, accepted on 03 Aug 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8SE00251G
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Benzothiadiazole-triphenylamine as efficient exciton blocking layer in small molecule based organic solar cells

    L. Calio, B. R. R. Patil, J. Benduhn, K. Vandewal, H. Rubahn, M. Madsen, S. Kazim and S. Ahmad, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00251G

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