Many two-dimensional (2D) semiconductors show promise for photovoltaic applications due to their desirable bandgap and predicted long carrier lifetimes. One 2D solar energy material candidate is BiI3. A time-resolved photoluminescence system, using time-correlated single photon counting (TCSPS), was established and used in conjunction with an existing spectrally-resolved photoluminescence spectroscopy apparatus for characterization of BiI3. A main peak was found at 1.82 eV and a wider peak at 1.67eV with carrier lifetimes of ~270 ps at the main peak. The optical properties of BiI3 were found to be uniform across the crystal surface. Future work will correlate these results with time-resolved terahertz spectroscopy in order to get a complete picture of photoexcited carrier dynamics.
Worcester Polytechnic Institute
Major Qualifying Project
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