- Research Areas
- Accelerator Physics
- Astronomy & Astrophysics
- Atomic, Molecular, & Optical Physics
- Computational Physics
- Condensed Matter Physics
- Cosmology and String Theory
- High Energy Physics
- Nano Science
- Nonlinear Optics & Photonics
- Plasma Physics
- Soft Condensed Matter/Fluids
- Statistical Physics
Colloquium: Thursday, May 5, 4:10 PM, Lewis Lab 316
Grain Boundary and Interfacial Structure-Composition-Property Relationships in CdTe-Based Solar Cells
Oak Ridge National Laboratory (ORNL)
CdTe based solar modules are the cheapest produced thin-film photovoltaics on the market, making solar electricity conversion competitive with fossil fuels. Cl diffusion through grain boundaries (GBs) followed by Cu diffusion from the back contact drastically increase CdTe device efficiencies without drastically increasing the production costs. The microscopic origin of these efficiency enhancements is studied through a series of electron beam induced current (EBIC), shown in light blue, and electron backscatter diffraction (EBSD) experiments, which reveal the microscopic short-circuit efficiency changes of the GBs (EBIC) after the Cu and Cl based treatments with respect to their orientations (EBSD). The source of the GB and interfacial current enhancements after the Cu and Cl treatments is revealed through the use of scanning transmission electron microscopy (STEM) electron energy loss spectroscopy (EELS) and atom probe tomography (APT) experiments. Overall, the basic concepts of several experimental techniques with a focus on microscopy and how they can be applied to solar cell devices to reveal the origins of efficiency enhancement at the nanoscale will be discussed.
Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.
Physics Colloquium Schedule for SPRING 2016
Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.