不经意，网上看到杨培东在CITRIS Research Exchange, Fall 2007 上的题为Inorganic Nanowires: Synthesis, Properties and Photovoltaic Applications 演讲。感觉很不错。这个上面的其他演讲也是免费观看的。尽管不是面对面的听报告，也还是听得身临其境啊。效果非常之好。贴出地址与大家分享。

http://www.citris-uc.org/event/RE-Nov-7

Abstact:

Nanowires are of both fundamental and technological interest. They represent the critical components in the potential nanoscale electronic and photonic device applications. The vapor-liquid-solid crystal growth mechanism has been utilized for the general synthesis of nanowires of different compositions, sizes, and orientation. Precise size control of the nanowires can be readily achieved using metal nanocrystals as the catalysts. Epitaxial growth plays a significant role in making such nanowire heterostructures and their arrays.

To this end, we have successfully synthesized superlattice nanowires and core-sheath nanostructures. Achieving such high level of synthetic control over nanowire growth allows us to explore some of their very unique physical properties. For example, semiconductor nanowires can function as self-contained nanoscale lasers, sub-wavelength optical waveguides, photodetector and efficient nonlinear optical mixer. It was also discovered that the thermoconductivity of the silicon nanowires can be significantly reduced when the nanowire size in the 20 nm region, pointing to a very promising approach to design better thermoelectrical materials. In addition, semiconductor nanowire arrays can be used as potential substrates to achieve high energy conversion efficiency in photovoltaics