Integrated Imaging Facility

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  • 1

    Article

    Electrochemical Hole Injection Selectively Expels Iodide from Mixed Halide Perovskite Films
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    Author(s):
    Gergely Samu, Adam Balog, Filippo De Angelis, Daniele Meggiolaro, Prashant Kamat, Csaba Janáky
    Abstract:

    Abstract Halide ion mobility in metal halide perovskites remains an intriguing phenomenon, influencing their optical and photovoltaic properties. Selective injection of holes through electrochemical anodic bias has allowed us to probe the effect of hole trapping at iodide (0.9 V) and bromide (1.15 V) in mixed halide perovskite (CH3NH3PbBr1.5I1.5) films. Upon trapping holes at the iodide site, the iodide gradually gets expelled from the mixed halide film (as iodine and/or triiodide ion), leavi…

    Date Published:
    2019-06
  • 2

    Article

    Tracking Transformative Transitions: From CsPbBr3 Nanocrystals to Bulk Perovskite Films
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    Author(s):
    Rebecca Scheidt, Corey Atwell, Prashant Kamat
    Abstract:

    The control of grain size and surface properties is an important parameter in controlling the optoelectronic and photovoltaic properties of metal halide perovskites. When CsPbBr 3 nanocrystal (∼10 nm in diameter) films were annealed at 100−125 °C, they grow in size to produce ∼400 nm diameter crystallites while transforming into bulk perovskite films. Characteristic changes in the optical properties were noted when such transformation occurred from nanocrystals into bulk. By tracking absorban…

    Date Published:
    2019-06
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