Nanopatterned Electrically Conductive Films of Semiconductor Nanocrystals
Author(s)Mentzel, Tamar; Wanger, Darcy Deborah; Ray, Nirat; Walker, Brian J.; Strasfeld, David B.; Bawendi, Moungi G.; Kastner, Marc; ... Show more Show less
Nanopatterned, Electrically Conductive Films of Semiconductor Nanocrystals
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We present the first semiconductor nanocrystal films of nanoscale dimensions that are electrically conductive and crack-free. These films make it possible to study the electrical properties intrinsic to the nanocrystals unimpeded by defects such as cracking and clustering that typically exist in larger-scale films. We find that the electrical conductivity of the nanoscale films is 180 times higher than that of drop-cast, microscopic films made of the same type of nanocrystal. Our technique for forming the nanoscale films is based on electron-beam lithography and a lift-off process. The patterns have dimensions as small as 30 nm and are positioned on a surface with 30 nm precision. The method is flexible in the choice of nanocrystal core–shell materials and ligands. We demonstrate patterns with PbS, PbSe, and CdSe cores and Zn[subscript 0.5]Cd[subscript 0.5]Se–Zn[subscript 0.5]Cd[subscript 0.5]S core–shell nanocrystals with a variety of ligands. We achieve unprecedented versatility in integrating semiconductor nanocrystal films into device structures both for studying the intrinsic electrical properties of the nanocrystals and for nanoscale optoelectronic applications.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Physics
American Chemical Society
Mentzel, Tamar S., Darcy D. Wanger, Nirat Ray, Brian J. Walker, David Strasfeld, Moungi G. Bawendi, and Marc A. Kastner. “Nanopatterned Electrically Conductive Films of Semiconductor Nanocrystals.” Nano Letters 12, no. 8 (August 8, 2012): 4404-4408.
Author's final manuscript