Nanopatterned Electrically Conductive Films of Semiconductor Nanocrystals
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- 作者：Tamar S. Mentzel ; Darcy D. Wanger ; Nirat Ray ; Brian J. Walker ; David Strasfeld ; Moungi G. Bawendi ; Marc A. Kastner
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：August 8, 2012
- 年：2012
- 卷：12
- 期：8
- 页码：4404-4408
- 全文大小：304K
- 年卷期：v.12,no.8(August 8, 2012)
- ISSN：1530-6992
文摘
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鈥搒hell materials and ligands. We demonstrate patterns with PbS, PbSe, and CdSe cores and Znb>0.5 b>Cdb>0.5 b>Se鈥揨nb>0.5 b>Cdb>0.5 b>S core鈥搒hell 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.<br>