Locally resolved large scale phase separation in polymer:fullerene blends
Locally resolved large scale phase separation in polymer:fullerene blends
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DOI：
10.1039/c5ta07004j
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发表时间：
2016-01
影响因子：
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通讯作者：
C. Kästner;M. Seeland;D. Egbe;H. Hoppe
中科院分区：
文献类型：
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作者：
C. Kästner;M. Seeland;D. Egbe;H. Hoppe
我们报道了一项利用电致发光成像(ELI)和光束感应电流(LBIC)测量来探索聚合物共混对大规模相分离的影响的综合研究。这项研究是基于一种半结晶和无定形的含菲poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene)(PPE-PPV)共聚物与[6，6]-苯基-C61-丁酸甲酯(PCBM)共混的基础上。由于半晶态聚合物An-PVAB与PCBM强烈相分离，而无定形聚合物An-PVba与PCBM紧密混合，因此可以通过以不同的比例混合两种聚合物来精确控制相分离。通过对电致发光图像和光束感应电流扫描的分析，我们可以分别得出相分离的块体材料和混合区域的电晕尺寸，其优点是可以一次探测到器件的整个有源层。
We report a comprehensive study probing the influence of polymer blending on the large scale phase separation by the use of electroluminescence imaging (ELI) and light-beam induced current (LBIC) measurements. The study is based on a semi-crystalline and an amorphous analogue of anthracene-containing poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) (PPE–PPV) copolymer (AnE-PVs) blended with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Since the semi-crystalline polymer AnE-PVab strongly phase separates from PCBM, whereas the amorphous polymer AnE-PVba intimately mixes with PCBM, the phase separation is precisely controlled by blending both polymers in distinct ratios. The analysis of electroluminescence images and light-beam induced current scans allowed us to conclude about the domain size of the phase separated bulk material and intermixed regions, respectively, with the advantage of probing the whole active layer of the device at once.