Conjugated Polymers Based on Difluorobenzoxadiazole toward Practical Application of Polymer Solar Cells
Conjugated Polymers Based on Difluorobenzoxadiazole toward Practical Application of Polymer Solar Cells
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DOI：
10.1002/aenm.201702033
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发表时间：
2017-09
影响因子：
27.8
通讯作者：
Junyi Wang;Shiliang Wang;Chunhui Duan;F. Colberts;J. Mai;Xi Liu;Xiao’e Jia;Xinhui Lu;R. Jans
中科院分区：
文献类型：
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作者：
Junyi Wang;Shiliang Wang;Chunhui Duan;F. Colberts;J. Mai;Xi Liu;Xiao’e Jia;Xinhui Lu;R. Jans
为了将聚合物太阳能电池（PSC）推向真实的世界应用，开发与低成本大规模制造技术兼容的材料至关重要。在这种情况下，实际有用的聚合物应满足几个关键要求：通过在温和的热条件下使用环境友好溶剂的低成本制造提供高功率转换效率（PCE）的能力，从而产生足够厚的活性层，以最大限度地减少大面积薄膜中的缺陷。在这里，新的光伏聚合物的发展报告，通过合理的分子设计，以满足这些要求。苯并二噻吩（BDT）-二氟苯并恶二唑（ffBX）-2-癸基十四烷基（DT），一种基于ffBX和BDT的宽带隙聚合物，作为满足资格的第一个例子出现。当与低成本受体（C60-富勒烯衍生物）混合时，BDT-ffBX-DT在活性层厚度超过250 nm时产生9.4%的PCE。BDT‐ffBX‐DT器件可以在低加工温度下由非卤化溶剂制造。BDT-ffBX-DT的成功源于其适当的电子结构和电荷传输特性，以及共混物中聚合物主链的有利正面取向，以及在本体异质结膜中形成具有纤维状双连续互穿网络的适当相分离形态的能力。凭借这些特性，BDT‐ffBX‐DT代表了聚合物太阳能电池未来日常应用的重要一步。
To advance polymer solar cells (PSCs) toward real‐world applications, it is crucial to develop materials that are compatible with a low‐cost large‐scale manufacturing technology. In this context, a practically useful polymer should fulfill several critical requirements: the capability to provide high power conversion efficiencies (PCEs) via low‐cost fabrication using environmentally friendly solvents under mild thermal conditions, resulting in an active layer that is thick enough to minimize defects in large‐area films. Here, the development of new photovoltaic polymers is reported through rational molecular design to meet these requirements. Benzodithiophene (BDT)‐difluorobenzoxadiazole (ffBX)‐2‐decyltetradecyl (DT), a wide‐bandgap polymer based on ffBX and BDT emerges as the first example that fulfills the qualifications. When blended with a low‐cost acceptor (C60‐fullerene derivative), BDT‐ffBX‐DT produces a PCE of 9.4% at active layer thickness over 250 nm. BDT‐ffBX‐DT devices can be fabricated from nonhalogenated solvents at low processing temperature. The success of BDT‐ffBX‐DT originates from its appropriate electronic structure and charge transport characteristics, in combination with a favorable face‐on orientation of the polymer backbone in blends, and the ability to form proper phase separation morphology with a fibrillar bicontinuous interpenetrating network in bulk‐heterojunction films. With these characteristics, BDT‐ffBX‐DT represents a meaningful step toward future everyday applications of polymer solar cells.