Perovskite films prepared with different conditions.
a) 105°C in air b) 115°C in air, c) 125°C in air, d) 105°C in Nitrogen, e) 115°C in Nitrogen, and f) 125°C in Nitrogen. Grain sizes on perovskite films are larger when prepared in air between 105 to 125 degrees centigrade than in a nitrogen atmosphere.
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