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Sequential Processing for Organic Photovoltaics: Design Rules for Morphology Control by Tailored Semi-Orthogonal Solvent Blends

机译:有机光伏的顺序加工:通过量身定制的半正交溶剂共混物进行形态控制的设计规则

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摘要

Design rules are presented for significantly expanding sequential processing (SqP) into previously inaccessible polymer:fullerene systems by tailoring binary solvent blends for fullerene deposition. Starting with a base solvent that has high fullerene solubility, 2-chlorophenol (2-CP), ellipsometry-based swelling experiments are used to investigate different co-solvents for the fullerene-casting solution. By tuning the Flory-Huggins χ parameter of the 2-CP/co-solvent blend, it is possible to optimally swell the polymer of interest for fullerene interdiffusion without dissolution of the polymer underlayer. In this way solar cell power conversion efficiencies are obtained for the PTB7 (poly[(4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)(3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl)]) and PC61BM (phenyl-C61-butyric acid methyl ester) materials combination that match those of blend-cast films. Both semicrystalline (e.g., P3HT (poly(3-hexylthiophene-2,5-diyl)) and entirely amorphous (e.g., PSDTTT (poly[(4,8-di(2-butyloxy)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-(2,5-bis(4,4′-bis(2-octyl)dithieno[3,2-b:2′3′-d]silole-2,6-diyl)thiazolo[5,4-d]thiazole)]) conjugated polymers can be processed into highly efficient photovoltaic devices using the solvent-blend SqP design rules. Grazing-incidence wide-angle x-ray diffraction experiments confirm that proper choice of the fullerene casting co-solvent yields well-ordered interdispersed bulk heterojunction (BHJ) morphologies without the need for subsequent thermal annealing or the use of trace solvent additives (e.g., diiodooctane). The results open SqP to polymer/fullerene systems that are currently incompatible with traditional methods of device fabrication, and make BHJ morphology control a more tractable problem.
机译:提出了设计规则,以通过为富勒烯沉积量身定制二元溶剂混合物,将顺序处理(SqP)显着扩展到以前无法使用的聚合物:富勒烯体系中。从具有较高富勒烯溶解度的基础溶剂2-氯苯酚(2-CP)开始,基于椭圆偏振的溶胀实验用于研究富勒烯浇铸溶液的不同助溶剂。通过调节2-CP /助溶剂混合物的Flory-Hugginsχ参数,可以优化溶胀富勒烯互扩散的目标聚合物而不会溶解聚合物底层。以这种方式,获得了PTB7(聚[(4,8-双[(2-乙基己基)氧基]苯并[1,2-b:4,5-b']二噻吩-2,6 -二基)(3-氟-2-[((2-乙基己基)羰基]噻吩并[3,4-b]噻吩二基)])和PC61BM(苯基-C61-丁酸甲酯)的材料组合投影片。半结晶的(例如,P3HT(聚(3-己基噻吩-2,5-二基))和完全无定形的(例如,PSDTTT(聚[(4,8-二(2-丁氧基)苯并[1,2-b:4 ,5-b']二噻吩-2,6-二基)-alt-(2,5-双(4,4'-双(2-辛基)二噻吩并[3,2-b:2'3'-d]可以使用溶剂混合SqP设计规则将silole-2,6-diyl)thiazolo [5,4-d] thiazole)])共轭聚合物加工成高效光伏器件。掠入射宽角X射线衍射实验确认适当选择富勒烯铸造助溶剂可产生有序的相互分散的本体异质结(BHJ)形态,而无需随后进行热退火或使用痕量溶剂添加剂(例如二碘辛烷),结果可将SqP引入聚合物/富勒烯目前与传统的器件制造方法不兼容的系统,使BHJ形貌控制更为棘手。

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  • 来源
    《Advanced energy materials》 |2015年第11期|1-11|共11页
  • 作者单位

    Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA USA;

    Department of Materials Science and Engineering University of California Los Angeles Los Angeles CA USA;

    Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA USA;

    Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA USA;

    Departments of Chemical Engineering and Chemistry University of Washington Seattle WA USA;

    Departments of Chemical Engineering and Chemistry University of Washington Seattle WA USA;

    Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA USA;

    Department of Materials Science and Engineering University of California Los Angeles Los Angeles CA USA;

    California NanoSystems Institute University of California Los Angeles Los Angeles CA USA;

    Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA USA;

    California NanoSystems Institute University of California Los Angeles Los Angeles CA USA;

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