Controlling donor crystallinity and phase separation in bulk heterojunction solar cells by the introduction of orthogonal solvent additives
Controlling donor crystallinity and phase separation in bulk heterojunction solar cells by the introduction of orthogonal solvent additives
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DOI：
10.1557/adv.2018.436
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发表时间：
2018-07
期刊：
影响因子：
0.8
通讯作者：
Shah Alam;R. Meitzner;C. Kaestner;C. Ulbricht;S. Hoeppener;D. Egbe;U. Schubert;H. Hoppe
中科院分区：
文献类型：
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作者：
Shah Alam;R. Meitzner;C. Kaestner;C. Ulbricht;S. Hoeppener;D. Egbe;U. Schubert;H. Hoppe
有机太阳能电池的本体异质结形态广泛地控制其器件效率和稳定性。施主相的结构顺序和畴大小强烈地影响电荷分离效率、复合速率和空穴通过本体到电极的渗透。在此，我们报告了一个全面的研究控制的聚合顺序已经开始在溶液中引入正交溶剂添加剂的蒽含有聚（对亚苯基-乙炔基）-alt-聚（对亚苯基-乙烯基）（PPE-PPV）共聚物的共同解决方案，轴承统计取代的线性辛氧基和2-乙基己氧基侧链在1：1的比例沿着的骨干（AnE-PVstat），和富勒烯衍生物苯基-C61-丁酸甲酯（PCBM）。第一种溶剂是氯苯和氯仿的1：1混合物，已发现可促进溶液和沉积膜中的相分离。通过向普通溶液中添加不同体积分数的甲醇，可以进一步增强并精确控制这种效果。因此，将聚合物聚集体从溶液转移到膜中的能力被应用于太阳能电池，并进行了详细研究。
The bulk heterojunction morphology of organic solar cells widely controls their device efficiency and stability. Structural order and domain size of the donor phase strongly impact the charge separation efficiency, recombination rates, and the hole percolation through the bulk to the electrode. Herewith, we report a comprehensive study on the control of polymeric order already initiated in solution by the introduction of orthogonal solvent additives to the common solution of anthracene containing poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) (PPE-PPV) copolymer, bearing statistically substituted linear octyloxy and 2-ethylhexyloxy side-chains in 1:1 ratio along the backbone (AnE-PVstat), and fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM). The first solvent, a 1:1 blend of chlorobenzene and chloroform, had been discovered to promote phase separation in solution and deposited films. This effect could be further enhanced and was precisely controlled by addition of methanol to the common solution in various volume fractions. Thus the ability to transfer the polymer aggregates from the solution into films was applied to solar cells and is investigated in detail.