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Advanced Materials

Multiscale Scanning Tunneling Microscopy Study of Self-Assembly Phenomena in Two-Dimensional Polycrystals of π-Conjugated Polymers: The Case of Regioregular Poly(dioctylbithiophene-alt-fluorenone)


  • This work was supported by the Micro- and Nanotechnology Program from the French Ministry of Research under the grant “RTB: Post CMOS moléculaire 200 mm”. Dr. R. Baptist, head of this research program at CEA-Grenoble, is gratefully acknowledged for his support. ADEME and CEA are acknowledged for partial funding (Convention de Recherche No. 0105148) through the CSPVP “Cellules Solaires Photovoltaïques Plastiques” research program. SPM facilities used for this work have been in part funded by “CPER Nanophysique”, région Rhône-Alpes, France.


A regioregular π-conjugated alternating copolymer that contains fluorenone and bithiophene subunits forms self-organized polycrystals with meso- and nanoscopic structural features is imaged by low-current scanning tunneling microscopy. Unlike conjugated polymers lacking the fluorenone subunit (Figure, left), the rigidity of the copolymer discourages chain folding and results in “fold-free” monodomains (right).

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