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Molecular Engineering of Highly Efficient Small Molecule Nonfullerene Acceptor for Organic Solar Cells

机译:用于有机太阳能电池的高效小分子非富勒烯受体的分子工程

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摘要

A new molecularly engineered nonfullerene acceptor, 2,2'-(5,5'-(9,9-didecyl-9H-fluorene-2,7-diyl) bis(benzo[c][1,2,5] thiadiazole7,4-diyl) bis(methanylylidene)) bis(3-hexyl-1,4-oxothiazolidine-5,2-diylidene)) dimalononitrile (BAF-4CN), with fluorene as the core and arms of dicyanon- hexylrhodanine terminated benzothiadiazole is synthesized and used as an electron acceptor in bulk heterojunction organic solar cells. BAF-4CN shows a stronger and broader absorption with a high molar extinction coefficient of 7.8 x 10(4) m(-1) cm(-1) at the peak position (498 nm). In the thin film, the molecule shows a redshift around 17 nm. The photoluminescence experiments confirm the excellent electron accepting nature of BAF-4CN with a Stern-Volmer coefficient (K-sv) of 1.1 x 10(5) m(-1). From the electrochemical studies, the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of BAF-4CN are estimated to be -5.71 and -3.55 eV, respectively, which is in good synchronization with low bandgap polymer donors. Using BAF-4CN as an electron acceptor in a poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3'''-di(2-octyldodecyl) 2,2; 5', 2 ''; 5 '', 2'''-quaterthiophen-5,5'''-diyl)] based bulk-heterojunction solar cell, a maximum power conversion efficiency of 8.4% with short-circuit current values of 15.52 mA cm(-2), a fill factor of 70.7%, and external quantum efficiency of about 84% covering a broad range of wavelength is achieved.
机译:一种新的分子工程化的非富勒烯受体2,2'-(5,5'-(9,9-二癸基-9H-芴-2,7-二基)双(苯并[c] [1,2,5]噻二唑7,合成了以芴为核心,以二氰基-己基若丹宁为末端的苯并噻二唑的4-二基)双(甲基亚甲基)双(3-己基-1,4-氧噻唑烷-5,2-二亚甲基))二丙二腈(BAF-4CN)。并用作整体异质结有机太阳能电池的电子受体。 BAF-4CN在峰位置(498 nm)处显示出更强和更宽的吸收率,并具有7.8 x 10(4)m(-1)cm(-1)的高摩尔消光系数。在薄膜中,分子显示出约17 nm的红移。光致发光实验证实了BAF-4CN的出色电子接受特性,其斯特恩-沃尔默系数(K-sv)为1.1 x 10(5)m(-1)。根据电化学研究,BAF-4CN的最高占据分子轨道和最低未占据分子轨道能级分别估计为-5.71和-3.55 eV,这与低带隙聚合物供体具有良好的同步性。在聚[(5,6-二氟-2,1,3-苯并噻二唑-4,7-二基)-alt-(3,3'''-二(2-辛基十二烷基)中使用BAF-4CN作为电子受体2,2; 5',2''; 5'',2'''-四噻吩-5,5'''-二基)]基体-异质结太阳能电池,在短时最大功率转换效率为8.4%电路电流值为15.52 mA cm(-2),填充系数为70.7%,外部量子效率约为84%,涵盖了广泛的波长范围。

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  • 来源
    《Advanced Functional Materials》 |2017年第2期|1603820.1-1603820.9|共9页
  • 作者单位

    Indian Inst Chem Technol, CSIR, Inorgan & Phys Chem Div, Hyderabad 500007, Andhra Pradesh, India|Acad Sci & Innovat Res AcSIR, New Delhi 110025, India;

    Natl Phys Lab, CSIR, Organ & Hybrid Solar Cell Grp, Dr KS Krishnan Marg, New Delhi 110012, India;

    Indian Inst Chem Technol, CSIR, Inorgan & Phys Chem Div, Hyderabad 500007, Andhra Pradesh, India;

    Indian Inst Chem Technol, CSIR, Inorgan & Phys Chem Div, Hyderabad 500007, Andhra Pradesh, India|Acad Sci & Innovat Res AcSIR, New Delhi 110025, India;

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