Luponosov YN, Min J, Khanin DA, Baran D, Pisarev SA, Peregudova SM, Dmitryakov PV, Chvalun SN, Cherkaev GV, Svidchenko EA, Ameri T, Brabec C, Ponomarenko SA (2015)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2015
Publisher: SPIE
Book Volume: 5
Journal Issue: 1
Two π-conjugated acceptor-donor-acceptor-donor-acceptor-type (A-D-A-D-A) oligothiophenes, TT-(2T-DCV-Hex) and BT-(2T-DCV-Hex) were designed and synthesized with thienothiadiazole (TT) or benzothiadiazole (BT) as the core and dicyanovinyl (DCV) as the terminal acceptor groups for comprehensively investigating and understanding structure-property relationships. The resulting oligomers were first characterized by thermal analysis, UV-Vis spectroscopy, and cyclic voltammetry. By simply changing the BT to TT core in these two oligothiophenes, the highest occupied molecular orbital levels were varied from-5.55 eV for BT-(2T-DCV-Hex) to-5.11 eV for TT-(2T-DCV-Hex), and the optical band gaps were varied from 1.72 eV for BT-(2T-DCV-Hex) to 1.25 eV for TT-(2T-DCV-Hex), ascribed to the stronger electron accepting character of the TT core. However, the power conversion efficiency of bulk heterojunction organic solar cells (OSCs) with TT-(2T-DCV-Hex) as donor and [6,6]-phenyl C70-butyric acid methyl ester (PC71BM) as acceptor was measured to be 0.04% only, which is much lower than that of BT-(2T-DCV-Hex):PC71BM (1.54%). Compared to the TT-(2T-DCV-Hex) system, the BT-(2T-DCV-Hex) based device shows smoother film surface morphology, and superior charge generation and charge carrier mobilities. Therefore, the results clearly demonstrate that in addition to modifying the alkyl side chains and p-bridge lengths, the design of new small molecules for high-performance OSCs should also aim to choose suitable acceptor units.
APA:
Luponosov, Y.N., Min, J., Khanin, D.A., Baran, D., Pisarev, S.A., Peregudova, S.M.,... Ponomarenko, S.A. (2015). Synthesis and photovoltaic effect in red/near-infrared absorbing A-D-A-D-A-type oligothiophenes containing benzothiadiazole and thienothiadiazole central units. Journal of Photonics for Energy, 5(1). https://doi.org/10.1117/1.JPE.5.057213
MLA:
Luponosov, Yuriy N., et al. "Synthesis and photovoltaic effect in red/near-infrared absorbing A-D-A-D-A-type oligothiophenes containing benzothiadiazole and thienothiadiazole central units." Journal of Photonics for Energy 5.1 (2015).
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