An Organic Donor/Acceptor Lateral Superlattice at the Nanoscale

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• 作者：Roberto Otero ; David É ; cija ; Gustavo Ferná ; ndez ; José ; Mar&iacute ; a Gallego ; Luis Sá ; nchez ; Nazario Mart&iacute ; n ; Rodolfo Miranda
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：7
• 期：9
• 页码：2602 - 2607
• 全文大小：1029K
• 年卷期：v.7,no.9(September 2007)
• ISSN：1530-6992

文摘

A precise control of the nanometer-scale morphology in systems containing mixtures of donor/acceptor molecules is a key factor to improvethe efficiency of organic photovoltaic devices. Here we report on a scanning tunneling microscopy study of the first stages of growth of2-[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 interactionswith the Au(111) herringbone surface reconstruction, mixed thin films spontaneously segregate into a lateral superlattice of interdigitatednanoscale stripes with a characteristic width of about 10-20 nm, a morphology that has been predicted to optimize the efficiency of organicsolar cells.