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Research Highlights
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Effects of Oxygen Partial Pressure, Deposition Temperature, and Annealing on the Optical Response of CdS:O Thin Films
Use of CdS:O window layers in CdTe solar cells has been shown to result in improved performance. Here, we characterize the optical properties of CdS:O films sputter deposited in the presence of varying quantities of oxygen. The work demonstrates that improvements in solar cells that make use of CdS:O layers result from increased ultraviolet transparency in the window layer, rather than a widened bandgap as was previously thought.
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Determination of the role of conductivity anisotropy and doping in single walled carbon nanotube thin films with THz spectroscopic ellipsometry
Wide spectral range ellipsometry spanning wavelengths from 3 mm to 210 nm is used to measure the optoelectronic properties of a carbon nanotube thin film while prepared in both doped and undoped states. The measurements are sensitive to the anisotropic electronic effects that exist in the nanotube network. While undoped, the resistivity across the film is ~100 times larger than the resistivity through the film.
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Optical gradients in a-Si:H thin films detected using real-time spectroscopic ellipsometry with virtual interface analysis
Real-time spectroscopic ellipsometry measurements are taken during the deposition of a-Si:H thin films on various substrates and with varying deposition conditions. A procedure for optimizing a virtual interface data modeling is developed which allows us to detect depth profiles in the optical properties of the resultant film.
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