New Electron Acceptor Derived from Fluorene: Synthesis and Its Photovoltaic Properties

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• 作者：P. Nagarjuna ; Anirban Bagui ; Jianhui Hou ; Surya Prakash Singh
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 30, 2016
• 年：2016
• 卷：120
• 期：25
• 页码：13390-13397
• 全文大小：547K
• 年卷期：0
• ISSN：1932-7455

文摘

Two new fullerene derivatives N3 and N6, derived from flourene, have been synthesized for the organic photovoltaic applications. The molecule N3 is a diarylmethano fullerene derivative, whereas N6 contains a chromophore 4-nitro-cyaostilbene (NCS). Their optical, electrochemical, and structural properties were systematically studied by ¹H and ¹³C NMR, FT-IR, and UV–visible absorption spectroscopy. A series of bulk heterojunction polymer solar cells was constructed from these newly developed acceptors using PBDTTT-C-T and PTB7 as electron donors with different donor-to-acceptor weight ratios along with the variation in the volume percentage of DIO additive. The best solar cells made from PTB7:N3 and PTB7:N6 blends exhibited power conversion efficiencies of 4.1 and 3.6%, and the cells made from PBDTTT-C-T:N3 and PBDTTT-C-T:N6 blends exhibited power conversion efficiencies of 2.3 and 1.4%, respectively, with a very high open circuit voltage of over 0.85 V.