Nanopatterned Electrically Conductive Films of Semiconductor Nanocrystals
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Author(s)
Mentzel, Tamar
Wanger, Darcy Deborah
Ray, Nirat
Walker, Brian J.
Strasfeld, David B.
Bawendi, Moungi G.
Kastner, Marc
Alternative Title
Nanopatterned, Electrically Conductive Films of Semiconductor Nanocrystals
Date Issued
July 2012
Journal
Nano Letters
Publisher
American Chemical Society
Citation
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.
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Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1021/nl3022863
