Colloquium Schedule

Colloquium: Thursday, May 5, 4:10 PM, Lewis Lab 316

Grain Boundary and Interfacial Structure-Composition-Property Relationships in CdTe-Based Solar Cells

Jonathan Poplawsky

Research Associate
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.

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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.        

January 28Brian CamleyUC San DiegoEmergent Collective Chemotaxis Without Single-Cell Gradient Sensing
February 4Francesca SerraU of PennsylvaniaGood Defects, or What Frustrated
Liquid Crystals Can Do
February 11Shana Elbaum-GarfinklePrinceton Univ.From Fluids to Fibers: Liquid Phase Separation and Aggregation of Disordered Proteins
February 18Wylie AhmedInstitut Curie, ParisActive Mechanics Keeps Our Cells Alive
February 25Andrea SorannoUniv. of ZurichSingle Molecule Spectroscopy of Intrinsically Disordered Proteins
March 3Aurelia Honerkamp-SmithUniv. of CambridgeThe Fluid Boundary: Considering Cell Membranes from a Soft Matter Perspective
March 10Thomas HartmanCornell Univ.Black Holes and the Bootstrap
March 17Spring Break--
March 24Renee FatemiUniv. of KentuckyDeconstructing the Partonic Origins of the Proton Spin
March 31Gus EvrardUniv. of MichiganCluster Cosmology: Models, Simulations and Reality
April 7Charles KeetonRutgers Univ.Focusing Cosmic Telescopes on the Distant Universe
April 14Michael StricklandKent State Univ.Melting the Universe
April 21Pavel KabosNIST, BoulderNear Field Microwave Microscopy of Low Dimensional Materials
April 28Gaurav BahlU. Illinois, Urbana-Cham.Brillouin Optomechanics and Opto-Mechano-Fluidics
May 5Jonathan PoplawskyOak Ridge National LabGrain Boundary and Interfacial Structure-Composition-Property Relationships in CdTe-Based Solar Cells
-Have a nice summer!--