Selective Crystallization of Organic Semiconductors on Patterned Templates of Carbon Nanotubes

Authors


  • The authors thank Colin Reese for designing the PDMS stamps and the electrode patterns. Z.B. acknowledges partial support from the National Science Foundation MRSEC Center for Polymeric Interfaces and Macromolecular Assemblies (under NSF Award DMR-0213618), Samsung Advanced Institute of Technology, Sloan Research Fellowship and Finmeccanica Faculty Scholar Fund. S.L. acknowledges the financial support from Stanford Graduate Fellowships. A.L.B. acknowledges the Bell Labs Graduate Research Fellowship and partial support from GEMSEC, an NSF support MRSEC Program at the UW. S.C.B.M. acknowledges financial support from the German Research Foundation (DFG, grant MA 3342/1-1). J.L. acknowledges financial support from the Intelligence Community Postdoctoral Fellowship.

Abstract

A method of patterning large arrays of organic single crystals is reported. Using single-walled carbon nanotube (SWNT) bundles as patterned templates, several organic semiconductor materials were successfully patterned, including p-type pentacene, tetracene, sexiphenylene, and sexithiophene, as well as n-type tetracyanoquinodimethane (TCNQ). This study suggests that the selective growth of crystals onto patterned carbon nanotubes is most likely due to the coarse topography of the SWNT bundles. Moreover, we observed that the crystals nucleated from SWNT bundles and grew onto SWNT bundles in a conformal fashion. The dependence of the number of crystals on the quantity of SWNT bundles is also discussed. The crystal growth can be directly applied onto transistor source-drain electrodes and arrays of organic single-crystal field effect transistors are demonstrated. The results demonstrate the potential of utilizing carbon nanotubes as nucleation templates for patterning a broad range of organic materials for applications in optoelectronics.

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