Materials with nanoscale dimensions often exhibit novel optical and electronic properties that could improve the performance of optoelectronic and electrochemical systems; however, transport in solids made of these materials remains poorly understood, leaving significant room for improvement in the way these materials are integrated into devices.

Join us for a balanced discussion on unconventional gas and oil, including its impact on the economy and environment and its overall influence on the energy landscape of the future. Program will include an introductory reel of video clips representing the range of perspectives on unconventional gas and oil, a moderated discussion and audience Q&A.

Panelists:

Graphene is the ultimate two-dimensional material consisting of a single layer of sp2 hybridized carbon. Here we explore different approaches to synthesize this carbon allotrope, ranging from chemical conversion to vapor phase deposition. Briefly, graphite can be converted into graphene oxide (GO) sheets, which readily disperse in water, and then can be reduced by various methods.

The ability to predict a variety of important thermodynamic and kinetic properties of electrode and electrolyte materials from first principles is providing opportunities to explore and design new battery concepts. Electrochemical energy storage at its core relies on the ability to convert the energy released or consumed by the formation or breaking of chemical bonds into electrical work.

The exploration and understanding of the crystallization, growth and the orientation of organic molecules on substrates is a very important feature in fundamental as well as applied research in the various fields of organic electronic device research. It is well known that the ordering and orientation of organic molecules significantly affects the electronic structure and transport properties, and the anisotropy of the transport properties in organic semiconductor thin films in particular has to be taken into account.

Meeting our future global energy needs in an environmentally responsible way is perhaps the greatest challenge facing the world in the twenty first century.

Solid-state lighting has made tremendous progress over the past decade, with the potential to make much more progress over the coming decade. In this talk, we review the current status of solid-state lighting relative to its ultimate potential to be "smart" and ultra-efficient. Smart, ultra-efficient solid-state lighting would enable both very high "effective" efficiencies, as well as potentially large increases in human productivity.

Multijunction solar cells are the first photovoltaic technology to surpass single-junction Shockley-Queisser theoretical efficiency limits, and represent the highest efficiency of any solar cell technology. Recent experimental results on high-efficiency solar cells with 3-, 4-, and 5- junctions will be presented. Many challenges remain to develop new semiconductors with lower rates of carrier recombination at the bandgaps needed to push toward still higher efficiencies.

In solar cells, free charge carriers can recombine both via bimolecular (Langevin) and trap-assisted recombination (Shockley-Read-Hall). Trap-assisted recombination of electrons and holes is governed by capture coefficients that are thermally activated with an identical activation energy as measured for the hole mobility μp. To elucidate which recombination mechanism is dominant in organic solar cells, we investigated Charge-transfer (CT) state electroluminescence in several polymer:fullerene bulk heterojunction solar cells.

This seminar will cover a few topics we are working on to understand and engineer solar and thermal radiation. The seminar will start with a discussion on near-field radiation heat transfer. Max Planck himself realized that the blackbody radiation law that now bears his name was limited to geometries much larger than the wavelength of thermal radiation. Theory has predicted that thermal radiation heat transfer between two surfaces separated by tens of nanometers can exceed that of Planck’s blackbody radiation law by several orders of magnitude.