Guo Changhe, Kozub Derek R, Vajjala Kesava Sameer, Wang Cheng, Hexemer Alexander, Gomez Enrique D
Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
ACS Macro Lett. 2013 Mar 19;2(3):185-189. doi: 10.1021/mz300547x. Epub 2013 Feb 14.
Resonant soft X-ray scattering (RSOXS) is a complementary tool to existing reciprocal space methods, such as grazing-incidence small-angle X-ray scattering, for studying order formation in polymer thin films. In particular, RSOXS can exploit differences in absorption between multiple phases by tuning the X-ray energy to one or more resonance peaks of organic materials containing carbon, oxygen, nitrogen, or other atoms. Here, we have examined the structural evolution in poly(3-hexylthiophene-2,5-diyl)/[6,6]-phenyl-C-butyric acid methyl ester mixtures by tuning X-rays to resonant absorption energies of carbon and oxygen. Our studies reveal that the energy dependence of RSOXS profiles marks the formation of multiple phases in the active layer of organic solar cells, which is consistent with elemental maps obtained through energy-filtered transmission electron microscopy.
共振软X射线散射（RSOXS）是一种用于研究聚合物薄膜中有序结构形成的互补工具，可补充现有的倒易空间方法，如掠入射小角X射线散射。特别是，通过将X射线能量调谐到含有碳、氧、氮或其他原子的有机材料的一个或多个共振峰，RSOXS可以利用多相之间的吸收差异。在这里，我们通过将X射线调谐到碳和氧的共振吸收能量，研究了聚（3-己基噻吩-2,5-二基）/[6,6]-苯基-C-丁酸甲酯混合物的结构演变。我们的研究表明，RSOXS谱的能量依赖性标志着有机太阳能电池活性层中多相的形成，这与通过能量过滤透射电子显微镜获得的元素图一致。
