The two thin films examined were both made from methylammonium lead iodide, a perovskite material commonly used in solar cell research, and differed in terms of the size of the crystal grains. Both materials were coated with a layer of protective plastic (polymetheylmethachylate). The cells were illuminated from below by a focused laser beam, and examined using MIM, which allowed researchers to map photoconductivity of the materials at the nano scale.
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