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首页> 外文期刊>Advanced Functional Materials >Optical, Electrical, and Magnetic Studies of Organic Solar Cells Based on Low Bandgap Copolymer with Spin 1/2 Radical Additives
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Optical, Electrical, and Magnetic Studies of Organic Solar Cells Based on Low Bandgap Copolymer with Spin 1/2 Radical Additives

机译：低能隙共聚物与自旋1/2自由基添加剂的有机太阳能电池的光，电和磁研究

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摘要

The charge photogeneration and recombination processes in organic photovoltaic solar cells based on blend of the low bandgap copolymer, PTB7 (fluorinated poly-thienothiophene-benzodithiophene) with C60-PCBM using optical, electrical, and magnetic measurements in thin films and devices is studied. A variety of steady state optical and magneto-optical techniques were employed, such as photoinduced absorption (PA), magneto-PA, doping-induced absorption, and PA-detected magnetic resonance (PADMR); as well as picosecond time-resolved PA. The charge polarons and triplet exciton dynamics in films of pristine PTB7, PTB7/fullerene donor-acceptor (D-A) blend is followed. It is found that a major loss mechanism that limits the power conversion efficiency (PCE) of PTB7-based solar cell devices is the "back reaction" that leads to triplet exciton formation in the polymer donor from the photogenerated charge-transfer excitons at the D-A interfaces. A method of suppressing this "back reaction" by adding spin 1/2 radicals Galvinoxyl to the D-A blend is presented; this enhances the cell PCE by ≈30%. The same method is not effective for cells based on PTB7/C70-PCBM blend, where high PCE is reached even without Galvinoxyl radical additives.
机译：利用薄膜和器件中的光，电和磁测量方法，研究了基于低带隙共聚物PTB7（氟化聚噻吩并噻吩-苯并二噻吩）与C60-PCBM混合物的有机光伏太阳能电池中的电荷光生和复合过程。采用了多种稳态光学和磁光技术，例如光致吸收（PA），磁致PA，掺杂诱发的吸收和PA检测的磁共振（PADMR）。以及皮秒时间分辨的功率放大器。遵循原始PTB7，PTB7 /富勒烯供体-受体（D-A）共混物薄膜中的电荷极化子和三重态激子动力学。已发现，限制基于PTB7的太阳能电池器件的功率转换效率（PCE）的主要损耗机制是“逆反应”，该逆反应导致DA供体中的光生电荷转移激子在DA中形成三重态激子。接口。提出了一种通过向D-A共混物中添加自旋1/2自由基加尔维诺尔来抑制这种“逆反应”的方法。这使单元PCE提升了约30％。相同的方法对于基于PTB7 / C70-PCBM混合物的电池无效，即使没有加尔维氧基自由基添加剂也无法达到较高的PCE。

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  • 来源
    《Advanced Functional Materials》 |2015年第12期|1895-1902|共8页
  • 作者

    Tek Basel; Uyen Huynh; Tianyue Zheng; Tao Xu; Luping Yu; Z. Valy Vardeny;

  • 作者单位

    Department of Physics &. Astronomy University of Utah Salt Lake City, UT 84112, USA;

    Department of Physics &. Astronomy University of Utah Salt Lake City, UT 84112, USA;

    Department of Chemistry and James Franck Institute The University of Chicago Chicago, IL 60637, USA;

    Department of Chemistry and James Franck Institute The University of Chicago Chicago, IL 60637, USA;

    Department of Chemistry and James Franck Institute The University of Chicago Chicago, IL 60637, USA;

    Department of Physics &. Astronomy University of Utah Salt Lake City, UT 84112, USA;

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