EE 310 Seminar, February 7, 2006

Fely Barrera fely at gloworm.Stanford.EDU
Wed Feb 1 09:08:09 PST 2006

Colloidal Nanocrystals: Single Electron Transport and Self Assembly

Date: Feb 7, 2006 (Tuesday)
Time: 4:15 pm - 5:05 pm
Place: Hewlett 102

Yi Cui
Assistant Professor
Department of Materials Science and Engineering
Stanford University

Colloidal nanocrystals represent an important type of nanomaterials for 
electronics, photonics and energy conversion. Understanding the electronic 
coupling characteristics of self-assembled nanocrystal materials is 
essential for these applications. Here I present my recent research in 
studying coupling in different forms of self-assembled nanocrystal 
systems. First, semiconductor nanotetrapods are unique self-assembled 
systems of quantum dots and rods. I have demonstrated by single electron 
transistor measurements that either ionic or covalent bonding-type of 
coupling can exist when the interaction between the quantum dot at the 
junction and the arm rods is weak or strong, respectively. Second, I have 
developed a facile fluidic method for organizing nanocrystals into 
large-scale device arrays, which incorporates a controlled number of 
nanocrystals at lithographically precise locations on a chip and within a 
circuit. The method provides interesting systems for studying chemic!
ally-tunable coupling phenomena.


Yi Cui went to University of Science and Technology of China, where he 
received a Bachelor's degree in Chemistry in 1998. He attended graduate 
school from 1998 to 2002 at Harvard University, where he worked under 
supervision of Professor Charles M. Lieber. His Ph.D thesis concerned 
semiconductor nanowires for nanotechnology including synthesis, 
nanoelectroncis and nanosensor applications. After that, he went on to 
work as a Miller Postdoctoral Fellow with Professor Paul Alivisatos at 
University of California, Berkeley and Ernest Orlando Lawrence Berkeley 
National Laboratory until now. His postdoctoral work was mainly on 
electronics and assembly using colloidal nanocrystals.  He is now an 
Assistant Professor in Department of Materials Science and Engineering at 
Stanford University. His current research is focused on nanomaterials 
synthesis, electronic properties, memory and sensor devices. He has 
received the Technology Review World Top Young Innovator Award (2004), 
Miller Research Fellowship (2003), Distinguished Graduate Student Award in 
Nanotechnology (Foresight Institute, 2002), Gold Medal of Graduate 
Student Award (Material Research Society, 2001).

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