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Super-Connected Graphenic Nanosheets via Well-Oriented Bridges of Naphthothiadiazole and Benzodithiophene-Containing Donor-Acceptors and Photovoltaic Applications Thereof

Abstract

Super-connected nanostructures were developed through bridging the reduced graphene oxide (rGO) nanosheets with poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) and poly[bis(triiso-propylsilylethynyl) benzodithiophene-bis(decyltetradecyl-thien) naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT) polymers. The higher tendency of conjugated polymers towards the rGO surface increased the thickness of super-connections up to 9–12 nm. The red-shifted and more intensified identifying peaks in ultraviolet-visible spectra and more quenched photoluminescence spectra of PBDT-DTNT/rGO nano-hybrids were ascribed to better π-stacking of PBDT-DTNT chains compared to PBDT-TIPS-DTNT-DT ones onto rGO nanosheets and their stronger donating-accepting features. The presence of TIPS side structures made the arrangement of PBDT-TIPS-DTNT-DTs more difficult. The donor-acceptor nano-hybrids were subsequently applied in the active layers of photovoltaic devices in sole and mixed states with the PBDT-DTNT and PBDT-TIPS-DTNT-DT complicated polymers. These types of innovatively designed nanostructures eliminate the needs for phenyl-C-butyric acid methyl ester (PCBM) and similar acceptor components. In contrast to poly(3-hexylthiophene) (P3HT)-based delicate morphologies, the active layers based on the complicated polymers such as PBDT-DTNT and PBDT-TIPS-DTNT-DT reflected coarser phase separations. Super-connected rGO nanosheets templated the larger phase separations particularly in the presence of donor polymer chains, and thereby high performance photovoltaics were acquired. The best-performing devices based on PBDT-DTNT/rGO+PBDT-DTNT reflected 11.15 mA/cm2, 0.67 V, 64% and 4.78% characteristics. The external quantum efficiency (EQE) experiments also verified the well-acted photovoltaics based on complicated polymers.

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Publication details

The article was received on 04 Jun 2018, accepted on 05 Nov 2018 and first published on 05 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ02779J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Super-Connected Graphenic Nanosheets via Well-Oriented Bridges of Naphthothiadiazole and Benzodithiophene-Containing Donor-Acceptors and Photovoltaic Applications Thereof

    S. Agbolaghi, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02779J

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