Synergistic Effect of Solvent and Epitaxy on the Formation of Anisotropic Structures of P3HT and P3HT/PCBM Films.
Synergistic Effect of Solvent and Epitaxy on the Formation of Anisotropic Structures of P3HT and P3HT/PCBM Films.
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DOI：
10.1021/acs.jpcb.9b03522
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
W. Memon;Jiali Li;Qunqun Fang;Z. Ren;Shouke Yan;Xiaoli Sun
中科院分区：
文献类型：
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作者：
W. Memon;Jiali Li;Qunqun Fang;Z. Ren;Shouke Yan;Xiaoli Sun
极化的有机半导体共混物可以赋予期望的性质，例如增强的电荷传输性质和偏振光发射或吸收。通过共混物在取向聚合物衬底上的外延结晶，实现了一种既适合溶液加工又能制备各向异性导电共混膜的技术。P3 HT和PCBM在取向聚乙烯（PE）衬底上的外延结构受所用溶剂的沸点影响。由高沸点邻二氯苯在聚乙烯上浇铸而成的P_3HT晶体，其c轴与聚乙烯的c轴平行，形成“侧面”和“正面”晶体。而用低沸点氯仿浇铸P3 HT时，晶体的“侧面”和“正面”取向较差。PCBM的加入不影响P3 HT的外延结晶行为。此外，在PE衬底上也获得了PCBM的各向异性结构。PE基板有效增加了“正面”晶体的数量，“正面”与“侧面”的比例是PSS：PEDOT基板的7倍。各向异性结构导致各向异性吸收和光致发光性质。二色性比为2的邻二氯苯浇铸样品的各向异性光学性能较好。P3 HT和P3 HT/PCBM薄膜的光致发光偏振比（IVH/IVV）约为。2，表明了其作为偏振发光体的潜在应用。
Polarized organic semiconductor blends can confer desirable properties, such as enhanced charge transport properties and polarized light emission or absorption. A technique that is not only adapted to solution processing but also producing anisotropic conducting blend films is realized by epitaxial crystallization of blends on oriented polymer substrate. The epitaxial structure of P3HT and PCBM on oriented polyethylene (PE) substrate is affected by the boiling point of the used solvent. The P3HT cast from o-dichlorobenzene with high boiling point on PE forms the "side-on" and "face-on" crystals with c-axis parallel to c-axis of PE. While the orientation of "side-on" and "face-on" crystals is poor when P3HT is casted from chloroform with low boiling point. The addition of PCBM does not affect the epitaxial crystallization behavior of P3HT. Moreover, anisotropic structure of PCBM is also obtained on PE substrate. PE substrate efficiently increases the amount of "face-on" crystals and the ratio of "face-on" to "side-on" is 7 times as much as that on PSS:PEDOT substrate. Anisotropic structures lead to anisotropic absorption and photoluminescence properties. The anisotropic optical properties are better for sample cast from o-dichlorobenzene with the dichroic ratio of 2. Photoluminescence polarization ratio (IVH/IVV) for P3HT and P3HT/PCBM film are ca. 2, which indicates the potential application as the polarized luminophors.