Abstract: Organic-inorganic perovskite semiconductors are a promising new material in the world of solar cell technology. Though these materials show promising photo conversion efficiencies (over 29% in perovskite-silicon tandem cells), they present numerous difficulties when facing real-world application. In mixed-halide perovskites, a phenomenon known as halide segregation occurs upon photoexcitation of the material, which can hinder the efficiency of the cell. Here, our lab looks at perovskite samples of various compositions made with the intent of boosting efficiencies and reducing defects that can lead to processes like halide segregation. We hope to use time-resolved terahertz spectroscopy to track electron mobility and lifetime within cells, as well as cathodal luminescence SEM and confocal microscopy to track halide segregation and determine the effectiveness of various defect mitigation techniques.
Video:
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Thursday, July 29th 1:15-2:30pm EDT