Welcome to the Photovoltaic Materials and Devices Group website at the University of Oklahoma!
The main focus of our group is to investigate novel materials and structures for next generation photovoltaic cells. Our methodology is based upon investigating the fundamental properties of new materials and systems, through various forms of optical spectroscopy and to correlate this knowledge to the operation of solar cell devices. Through this process we aim to gain a full understanding of the promise of such new materials for high-efficiency photovoltaics, determined by the physical mechanisms driving or inhibiting their operation.
Current projects performed in the group involve investigations of low-dimensional systems for third-generation PV including: quantum dot intermediate band solar cells, multi-exciton generation, and hot carrier cells. Much of the focus of this work is on narrow-gap semiconductors such as epitaxial InAs, InSb, and InN along with colloidal PbS. We, also, have a strong activity to investigate the fundamental limitations of GaInNAs materials for multi-junction solar cell applications. This work is performed in collaboration with industrial partners at Amethyst Research Inc. in Ardmore, OK.
As well as partnerships with industry, the group also collaborates strongly with the groups of Professor Santos (MBE growth), Professor Bumm (Dept. Physics), and Professor Wang (Dept. Chemical, Biological and Materials Engineering) at OU. In addition, we continue fruitful partnerships with groups at the University of Oxford, and University College London (U.K.), CRHEA-CNRS, France, as well as here in the United States with groups at the Naval Research Laboratory (Washington D.C.), SUNY-Buffalo, NY and the University of Tulsa, OK.
Thank you for visiting our website - enjoy!
Dr. Ian R. Sellers (Head of Group)
News and Updates
- December 27th, 2017 - "An Investigation of the Role of Radiative and Nonradiative Recombination Processes in InAs/GaAs1–xSbx Quantum Dot Solar Cells ," has been published, 27 December 2017, in IEEE Journal of Photovoltaics, doi: 10.1109/JPHOTOV.2017.2779325.
- November/December, 2017 - Dr. Sellers presents several invited seminars on our work on next generation PV at University College London, the University of Oxford, and the University of Sheffield in the U.K., and at Old Dominion University in Norfolk, VA.
- November 21st, 2017 - Yang Cheng successfully defended his PhD thesis on the "Quantum Dot for Photovoltaics Applications" and now leaves the group to join Intel. Congratulations and good luck!
- June 15th, 2017 - "The effect of an InP cap layer on the photoluminescence of an InxGa1-xAs1-yPy/InzAl1- zAs quantum well heterostructure," has been published, June 2017, in Journal of Applied Physics, doi: 10.1063/1.4985614.
- May 11th, 2017 - "The effect and nature of N-H complexes in the control of the dominant photoluminescence transitions in UV-hydrogenated GaInNAs," has been published, 11 May 2017, in RSC Advances, doi: 10.1039/C7RA02900D.
- April 17th, 2017 - "Effect of occupation of the excited states and phonon broadening on the determination of the hot carrier temperature from continuous wave photoluminescence in InGaAsP quantum well absorbers," has been published online, 17 April 2017, in Progress in Photovoltaics: Research and Applications, doi: 10.1002/pip.2890.
Collaborators and Funding
- Solar Energy Materials Initiative, Department of Materials, University of Oxford, UK
- CRHEA-CNRS, France
- Petrou Group, SUNY-Buffalo, U.S.A
- Sharp Laboratories of Europe Ltd.
- Liu Group, University College London, U.K.