Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session D29: Physics and Materials for Inorganic Photovoltaics: II
2:30 PM–5:30 PM,
Monday, March 15, 2010
Sponsoring Units: DMP GERA
Chair: Jeffrey Neaton, Lawrence Berkeley National Laboratory
Abstract ID: BAPS.2010.MAR.D29.8
Abstract: D29.00008 : Inorganic Alloys and Nanostructures for Photovoltaics*
4:18 PM–4:54 PM
Preview Abstract Abstract
(Lawrence Berkeley National Laboratory)
Semiconductor alloys and nanostructures are often used as photovoltaics materials and building blocks. In this talk, I will present results using large scale ab initio calculations to study the electronic structures and optical properties of semiconductor alloys and nanosystems. First, I will discuss the results of GaN:ZnO alloy, its atomic structures and electronic properties. GaN:ZnO is an unconventional locally nonstoichiometric alloy. A special model Hamiltonian is developed to describe its configuration total energy and to study its atomic structure. We found that GaN:ZnO forms a homongeneous alloy with strong short range order at high temperature. Such short range order has big effect on its band structure and band edge electron states. The second system to be discussed is ZnTe:O. In this alloy, the O atoms induce an intermediate band within the ZnTe band gap. This can be used for intermediate band solar cell. The change of this intermediate band as a function of the O centration will be discussed. The theoretical solar cell efficiency calculated based on the optical absorption spectra between different bands is 63\%. The other aspects of the material in order to reach such high efficiency will be discussed. Finally, I will present results of exciton binding energies in heterojunction nanostructures (e.g., nanorods or wires), especially for CdSe/CdTe and ZnO/ZnS nanorods. We found large exciton binding energies in such nanostructures at the interface. The implication of such large exciton binding energy and its effect on solar cell efficiency will be discussed.
*This work is supported by DOE/SC/BES, DOE/SC/ARSC, the National Energy Research Scientific Computer Center (NERSC), Oakridge Leadership Computing Facility (OLCF) and Argonne Leadership Computing Facility (ALCF), and the DOE INCITE program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.D29.8
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700