Upcoming Talks

Date: Apr. 24 (Friday) – Tomorrow!

Transparent Conductors: the Current and the Future

Speaker - Jung-Yong Lee (Prof. Peter Peumans group) http://peumans-pc.stanford.edu/

Location: McCullough 115

Time: 12:00 noon - 1:00pm

Abstract: Transparent conductive electrodes are important components of thin-film solar cells, light-emitting diodes, and many display technologies. Doped metal oxides are commonly used, but their optical transparency is limited for films with a low sheet resistance. Furthermore, they are prone to cracking when deposited on flexible substrates, are costly, and require a high-temperature step for the best performance. We demonstrate solution-processed transparent electrodes consisting of random meshes of metal nanowires that exhibit an optical transparency equivalent to or better than that of metal-oxide thin films for the same sheet resistance. Organic solar cells deposited on these electrodes show a performance equivalent to that of devices based on a conventional metal-oxide transparent electrode.

Previous Seminars

2009

January 16, 2009

Speaker: Dr. Zhuang Liu (Prof. Hongjie Dai group) Title: Biomedical Application of Carbon Nanotubes Location: CISX 101 Time: 1:00-2:00pm

January 30th, 2009

Speaker: Larkhoon Leem

Title: Spin-torque Strikes Back!: The present & future of spintronics

Location: McCullough 115

Time: 12:00pm

Abstract: As a non-charge based electronics, Spintronics holds a potential for a new type of device that will be cheaper, faster and more efficient than current memory or logic device. Although its original concept as a spin-transistor has not been demonstrated yet, Spintronics have been a workhorse for scaling of hard disk drive(HDD) and magnetic random access memory(MRAM). In recent years, spintronics is receiving more attention due to the discovery of phenomenon called spin-torque transfer. It is a magnetization precession process induced directly by electrical current. In this talk, physics of spin-torque transfer and devices based on this technology will be discussed. Also, recent Spintronics research effort on spin-torque logic device and spin oscillator in J. Harris group will be introduced.

Feburary 13th, 2009

Speaker: David Schoen (Cui Group)

Title: Investigating structure property relationships in compound semiconductors using single nanowire devices

Location: McCullough 115

Time: 12:00pm

April 10th, 2009

Speaker: Dr. Jung-Tsung Shen (Prof. Shanhui Fan group)

Title: Manipulating light at single wavelength or deep sub-wavelength scales open new device and material possibilities

Location: CISX 101

Time: 1:00pm-2:00pm

Abstract: The capability of manipulating light using deep sub-wavelength structures opens up new device and material possibilities. In this talk, I will describe our recent research in this aspect and give two examples enabled by such capability. The first example is the strongly correlated photon transport in nano-photonic waveguides. Photons normally do not directly interact with each other, yet many practical considerations, such as quantum communication and information processing, and other novel optoelectronics devices require the use of entangled photons. I will describe how to deterministically generate and manipulate strong photon-photon interactions via a two-level system. Such strong interactions have profound consequences on the photon transport properties. A deep understanding of the mechanism also provides a key to achieve low power optical switching at single-photon level. It also represents the most fundamental form of nonlinear optics. Moreover, the configuration is well-suited for on-chip all solid-state implementations. In the second part of my talk, I will describe how to design novel metamaterials by exploiting the electromagnetic states at subwavelength scales. In particular, I will discuss the mechanisms and properties of a special class of metamaterials -- broadband, ultra-high refractive index metamaterials. Such artificial structures will be useful in many applications such as subwavelength lithography and imaging, broadband slow-light, and sensitive interferometer.

2008

October 10th, 2008

Speaker: Candace Chan, PhD Student from Prof. Yi Cui group

Title: High-Performance Lithium Battery Anodes Using Silicon Nanowires

Location: McCullough Rm. 122

Time: 12:00-2:00pm

Free food and drinks served

October 24th, 2008

Speaker: Deji Akinwande

Title: Adventures with Carbon Nanotubes : Nanoscience, Nanotechnology & Applications

Location: Hewlett 102

Time: 12:00-2:00pm

November 7th, 2008

Speaker: Keji Lai, Postdoc Scholar in Prof. Z.X. Shen group

Title: Microwave imaging at the nanoscale -- principles and applications

Location: McCullough 115

Time: 12:00-1:00pm

Slides (pdf)

November 21th, 2008

Speaker: Andrei Faraon, Ph.D. student in Prof. Jelena Vuckovic group

Title: Photonic crystal devices for classical and quantum information science

Location: McCullough 115

Time: 12:00-1:00pm

December 5th, 2008

Speaker: TBA Title: TBA Location: McCullough 115 Time: 12:00-1:00pm