Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging
Work Function Modification in P3HT H/J Aggregate Nanostructures Revealed by Kelvin Probe Force Microscopy and Photoluminescence Imaging
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DOI：
10.1021/acsnano.5b03422
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发表时间：
2015-07-01
期刊：
影响因子：
17.1
通讯作者：
Barnes, Michael D.
中科院分区：
文献类型：
--
作者：
Baghgar, Mina;Barnes, Michael D.
我们发现，通过开尔文探针力显微镜（KPFM）探测的聚-3-己基噻吩（P3 HT）结晶纳米纤维的表面电子性质敏感地取决于聚合物堆积顺序和主导耦合类型（例如，H-或J-聚集体），如通过吸收或光致发光光谱所示。高分子量（J-聚集体）纳米纤维和低分子量（H-聚集体）纳米纤维之间的标称HOMO能量相差约160 meV。这是一致的预期从H型电荷转移（CT）的相互作用，降低HOMO能量，根据相邻的聚合物链上的噻吩部分之间的注册的位移。这些结果表明，如何KPFM结合波长分辨光致发光成像可以用来提取信息的“暗”（CT）在聚合物组件的相互作用。
We show that surface electronic properties of poly-3-hexylthiophene (P3HT) crystalline nanofibers as probed by Kelvin probe force microscopy (KPFM) depends sensitively on the degree of polymer packing order and dominant coupling type (e.g., H- or J-aggregate) as signaled by absorption or photoluminescence spectroscopy. Nominal HOMO energies between high molecular weight (J-aggregate) nanofibers and low-molecular weight (H-aggregate) nanofibers differ by approximate to 160 meV. This is consistent with shifts expected from H-type charge-transfer (CT) interactions that lower HOMO energies according to registration between thiophene moieties on adjacent polymer chains. These results show how KPFM combined with wavelength-resolved photoluminescence imaging can be used to extract information on "dark" (CT) interactions in polymer assemblies.