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首页> 外文期刊>Advanced energy materials >Solvent-Polarity-Induced Active Layer Morphology Control in Crystalline Diketopyrrolopyrrole-Based Low Band Gap Polymer Photovoltaics
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Solvent-Polarity-Induced Active Layer Morphology Control in Crystalline Diketopyrrolopyrrole-Based Low Band Gap Polymer Photovoltaics

机译：基于结晶二酮吡咯并吡咯的低能带隙聚合物光伏中溶剂极性诱导的活性层形貌控制

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摘要

Solvent effects on the morphology of diketopyrrolopyrrole (DPP)-based low band gap polymer (PDPPBT):phenyl-C71-butyric acid methyl ester (PC71BM) blends are studied systematically using a mixture of a non-aromatic polar primary solvent with high boiling point (b.p.) secondary solvents of increasing polarities. An unfavorable solvent-PC71BM interaction, due to a polarity mismatch, leads to significantly different morphology, also affecting the growth process of polymer crystallites. Non-aromatic polar solvent produces large PC71BM aggregates that increase in size with the addition of non-polar secondary solvents. The size scales of the aggregates decrease markedly when polar solvents are instead used as the secondary solvents. This processing method fundamentally changes the behavior of phase separation, creating a percolated fibrillar type network structure. Moreover, polar secondary solvents with lower vapor pressures reduce the interfibrillar distances that enhance the device performance even more. Power conversion efficiencies (PCE) of 0.03% to 5% are obtained, depending on the solvent system used.
机译：使用高沸点非芳族极性主要溶剂的混合物，系统研究了溶剂对二酮基吡咯并吡咯（DPP）基低带隙聚合物（PDPPBT）：苯基-C71-丁酸甲酯（PC71BM）共混物形态的影响（bp）增加极性的辅助溶剂。由于极性不匹配，不良的溶剂-PC71BM相互作用会导致形态显着不同，这也影响了聚合物微晶的生长过程。非芳香族极性溶剂会产生较大的PC71BM聚集体，并会增加非极性辅助溶剂的尺寸。当将极性溶剂代替用作辅助溶剂时，聚集体的尺寸尺度显着减小。这种处理方法从根本上改变了相分离的行为，从而形成了渗透的原纤维型网络结构。此外，具有较低蒸气压的极性仲溶剂减少了原纤间距离，从而进一步提高了设备​​性能。根据所使用的溶剂系统，可以得到0.03％至5％的功率转换效率（PCE）。

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  • 来源
    《Advanced energy materials》 |2014年第2期|1-10|共10页
  • 作者

    Sunzida Ferdous; Feng Liu; Dong Wang; Thomas P. Russell;

  • 作者单位

    Department of Polymer Science and Engineering University of Massachusetts Amherst MA USA;

    Department of Polymer Science and Engineering University of Massachusetts Amherst MA USA;

    Department of Polymer Science and Engineering University of Massachusetts Amherst MA USA;

    Advanced Institute for Materials Research Tohoku University Sendai Japan;

    Department of Polymer Science and Engineering University of Massachusetts Amherst MA USA;

    Advanced Institute for Materials Research Tohoku University Sendai Japan;

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  • 正文语种 eng
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  • 关键词

    active layer morphology; solvent polarity; mixed solvents; additives; low band gap organic solar cells;

    机译：活性层形态;溶剂极性;混合溶剂;添加剂;低带隙有机太阳能电池;

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