Otero Roberto, Ecija David, Fernandez Gustavo, Gallego José María, Sanchez Luis, Martín Nazario, Miranda Rodolfo
Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Nano Lett. 2007 Sep;7(9):2602-7. doi: 10.1021/nl070897z. Epub 2007 Jul 27.
A precise control of the nanometer-scale morphology in systems containing mixtures of donor/acceptor molecules is a key factor to improve the efficiency of organic photovoltaic devices. Here we report on a scanning tunneling microscopy study of the first stages of growth of 2-[9-(1,3-dithiol-2-ylidene)anthracen-10(9H)-ylidene]-1,3-dithiole, as electron donor, and phenyl-C61-butyric acid methyl ester, as electron acceptor, on a Au(111) substrate under ultrahigh vacuum conditions. Due to differences in bonding strength with the substrate and different interactions with the Au(111) herringbone surface reconstruction, mixed thin films spontaneously segregate into a lateral superlattice of interdigitated nanoscale stripes with a characteristic width of about 10-20 nm, a morphology that has been predicted to optimize the efficiency of organic solar cells.
精确控制包含供体/受体分子混合物的系统中的纳米级形态，是提高有机光伏器件效率的关键因素。在此，我们报告了一项扫描隧道显微镜研究，该研究针对在超高真空条件下，电子供体2-[9-(1,3-二硫醇-2-亚基)蒽-10(9H)-亚基]-1,3-二硫酚和电子受体苯基-C61-丁酸甲酯在Au(111)衬底上生长的初始阶段。由于与衬底的键合强度不同以及与Au(111)人字纹表面重构的相互作用不同，混合薄膜会自发地分离成具有约10-20nm特征宽度的叉指状纳米级条纹的横向超晶格，这种形态已被预测可优化有机太阳能电池的效率。
