lesson+6-NW+device

What is a nanowire?

?A nanowire is a wire of diameter of the order of a nanometer (10?9meters).

?Alternatively, nanowires can be defined as

structures that have a lateral size constrained to tens of nanometers or less and an unconstrained longitudinal size.

?At these scales, quantum mechanical effects are important —hence such wires are also known as "quantum wires".

etc

e.g., Si, ZnO,InP, GaN, etc

composed of repeating molecular units either

SiO2

Quasi-one dimensional nanomaterials prepared in our group

Cu2S JNN 2008

CNT 50μm WO 3APL 2005

SiC APL2002, APL2006

CuO APL2003 APL2005

50 μm

Quasi-one dimensional nanomaterials

prepared in our group

MoO 3, APL2003

WO x Adv Mater 2005

Mo, MoOx, Adv Mater 2003Preparation methods

Possible evolution of the field-effect transistor.

(a) Metal-oxide-semiconductor FET (MOSFET): the planar gate affects the

conducting channel from one direction. (b) FINFET: the gate surrounds the channel from all but one side. (c) Nanowire FINFET: complete, but nonuniform wrap-around gate. (d) Vertical nanowire FET: the gate has a complete, uniform wrap-around gate. (e) Vertical array of nanowires after wrap-gate formation.Y. Cui, Z. Zhong, D. Wang, W. U. Wang, and C. M. Lieber, “High performance silicon nanowire field effect transistors,” Nano Lett., vol. 3, no. 2, pp. 149-152, 2003.

Z. Zhong, D. Wang, Y. Cui, M. W. Bockrath, and C. M. Lieber, “Nanowire crossbar arrays as address decoders for integrated nanosystems,” Science, vol. 302, pp.1377-1379, 2003.

Logic Gates and Computation from Assembled Nanowire Building Blocks

?Yu Huang,et al, Lieber Group,

?SCIENCE, VOL294, p1313, 9 NOVEMBER 2001

Crossed NW nanodevice elements.

Nanowire Thermoelectric Converter:

Silicon Nanowires Turn Heat to Electricity

nhanced thermoelectric performance of rough silicon nanowires p163

?The difference in temperature between two sides of a chip [red is hot, blue is cold]

cause electrons to flow in a roughened silicon nanowire.

?Peidong Yang group, Enhanced thermoelectric performance of rough silicon

nanowires, Nature, 451, p163,2008

Silicon Nanowires Turn Heat to

Electricity

NANOFURNACE: An array of nanowires [green] convert heat from the temperature difference between two slivers of a microchip. Current in flowing through a heater [red] causes the temperature difference.B. TIAN, LIEBER

Nature, 449, p885, 18 October 2007

Nanogenerator using ZnO NW Nanogenerator using ZnO NW

?Z. L. Wang, J. Song, Science 2006, 312,

242.

?X. Wang, J. Song, J. Liu, Z. L. Wang,

Science 2007, 316, 102.

?J. Song, J. Zhou, Z. L. Wang, Nano Lett.

2006, 6, 1656.

?P. X. Gao, J. Song, J. Liu, Z. L. Wang,

Adv. Mater. 2007, 19, 67.

?X. Wang, J. Liu, J. Song, Z. L. Wang,

Nano Lett. 2007, 7, 2475.

Energy Harvesting Using Nanowires?

?Marin Alexe, et al, Adv.

Mater. 2008, 20, 4021–4026

Comparison of signals detected in two different systems, viz. Si and ZnO nanowire arrays.

Power generation with laterally packaged piezoelectric fine wires

?

Rusen Yang, Yong Qin, Liming Dai and Zhong Lin Wang, Power generation with laterally packaged piezoelectric fine wires, Nature Nanotechnology, Advance online publication