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A new non-fullerene acceptor based on the combination of a heptacyclic benzothiadiazole unit and a thiophene-fused end group achieving over 13% efficiency

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Abstract

A new non-fullerene acceptor, namely Y10, based on dithienothiophen[3,2-b]-pyrrolobenzothiadiazole (TPBT) as the central core and 2-(6-oxo-5,6-dihydro-4H-cyclopenta[c]thiophen-4-ylidene)malononitrile (TC) as the electron-deficient end group, has been designed and synthesized. Y10 reveals a narrow optical energy gap (Eoptg) of 1.35 eV with a broad absorption band from 600 to 900 nm. A wide bandgap polymer, J11, as the donor material (Eoptg = 1.96 eV) is used to blend with Y10 for the construction of organic solar cell devices, which achieve an impressive power conversion efficiency (PCE) of 13.46% with an open circuit voltage (Voc) of 0.89 V, a short circuit current (Jsc) of 21.21 mA cm−2, and a fill factor (FF) of 71.55%, with thermal annealing treatment at 100 °C for 5 min and 0.8 wt% 1-chloronaphthalene (CN) as an additive. These results indicate that the incorporation of the TPBT unit as the central core and the TC unit as the electron-deficient end group provides an efficient strategy for the construction of high performance solar cells.

Graphical abstract: A new non-fullerene acceptor based on the combination of a heptacyclic benzothiadiazole unit and a thiophene-fused end group achieving over 13% efficiency

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Publication details

The article was received on 11 Sep 2019, accepted on 15 Nov 2019 and first published on 29 Nov 2019


Article type: Paper
DOI: 10.1039/C9CP05015A
Phys. Chem. Chem. Phys., 2019, Advance Article

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    A new non-fullerene acceptor based on the combination of a heptacyclic benzothiadiazole unit and a thiophene-fused end group achieving over 13% efficiency

    Y. Zhang, F. Cai, J. Yuan, Q. Wei, L. Zhou, B. Qiu, Y. Hu, Y. Li, H. Peng and Y. Zou, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP05015A

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