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High efficiency, broad bandwidth, and robust angular tolerance are key considerations in photonic device design. Here, a few‐layer, asymmetric light transmitting metasurface that simultaneously satisfies all the above requirements is reported. The metasurface consists of coupled metallic sheets. It has a measured transmission efficiency of 80%, extinction ratio of 13.8 dB around 1.5 μm, and a full...
CH3NH3PbI3 perovskite films for photovoltaics (PV) have been deposited by vapor deposition and solution processing. Spectroscopic ellipsometry from the near infrared to ultraviolet (0.75 to 5.89 eV) is used to study the optical response of CH3NH3PbI3. In-situ spectroscopic ellipsometry is applied to monitor CH3NH3PM3 undergoing degradation in laboratory ambient conditions to study the degradation...
CH3NH3PbX3 (X=I, Cl) perovskite films of interest for photovoltaics (PV) devices have been deposited by (i) evaporation followed by vapor annealing and (ii) co-evaporation. Near infrared to ultraviolet spectroscopic ellipsometry has been used to determine the spectroscopic optical response for vapor-annealed material ex situ and co-evaporated material in situ during growth. Real time spectroscopic...
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