论文标题
与非富勒烯受体O-IDTBR合并的P3HT溶液的亚镜凝胶和剪切的动力学
Dynamics of the sub-ambient gelation and shearing of solutions of P3HT incorporated with a non-fullerene acceptor o-IDTBR towards active layer formation in bulk heterojunction organic solar cells
论文作者
论文摘要
包含由聚合物（3-己基噻吩）（P3HT）和电子受体分子组成的纳米结构混合物组成的活性层的有机太阳能电池（OSC）具有与基于硅的光伏面板竞争的潜力。但是，这种潜力主要是由于相互关联的生产和稳定性问题而无法实现的。无法缩放用于制造有机太阳能电池的通常使用的自旋涂层工艺。最近，他等人报告说，在亚ambient条件下，p3HT与[6,6] - 苯基-C61-丁基丁酸甲基酯（PC60BM）的凝胶化可以提供有机太阳能电池的连续挤出/涂层，从而在电力转换效率（PCCES/pCCES）中增加了一定的速度（PCCES/PC60）。 P3HT/PC60BM凝胶的。这里使用振荡性和稳定的扭转流来研究p3HT在亚ambient条件下用最近提出的非富勒烯O-IDTBR的P3HT的凝胶形成动力学。观察到通过线性粘弹性材料函数定义的凝胶强度通过小振幅振荡剪切确定为P3HT和O-IDTBR浓度的功能，所使用的溶剂和剪切条件。 Overall, the gels which formed upon quenching to sub-zero temperatures were found to be stable during small-amplitude oscillatory shear (linear viscoelastic range) but broke down even at the relatively low shear rates associated with steady torsional flows, suggesting that the shearing conditions used during the processing of gels of P3HT with small molecule acceptor blends can alter the gel structure and possibly affect the resulting active layer performance.
Organic solar cells (OSCs) containing an active layer consisting of a nanostructured blend of a conjugated polymer like poly(3-hexylthiophene) (P3HT) and an electron acceptor molecule have the potential of competing against silicon-based photovoltaic panels. However, this potential is unfulfilled primarily due to interrelated production and stability issues. The generally employed spin coating process for fabricating organic solar cells cannot be scaled up. Recently, He et al., have reported that the gelation of P3HT with [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) under sub-ambient conditions can provide a continuous extrusion/coating based route to the processing of organic solar cells and that increases in power conversion efficiencies (PCEs) of the P3HT/PC60BM active layer are possible under certain shearing and thermal histories of the P3HT/PC60BM gels. Here oscillatory and steady torsional flows were used to investigate the gel formation dynamics of P3HT with a recently proposed non-fullerene o-IDTBR under sub-ambient conditions. The gel strengths defined on the basis of linear viscoelastic material functions as determined via small-amplitude oscillatory shear were observed to be functions of the P3HT and o-IDTBR concentrations, the solvent used and the shearing conditions. Overall, the gels which formed upon quenching to sub-zero temperatures were found to be stable during small-amplitude oscillatory shear (linear viscoelastic range) but broke down even at the relatively low shear rates associated with steady torsional flows, suggesting that the shearing conditions used during the processing of gels of P3HT with small molecule acceptor blends can alter the gel structure and possibly affect the resulting active layer performance.
