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Drop-casting was used to make MAPbI3 films for solar cells. The crystal growth in drop-cast MAPbI3 films was regulated by adjusting temperature. A mechanism for the formation of different morphology was proposed by combining in situ crystal-growth study with XRD measurements. The crystals in the films made at low temperature (60 °C) and high temperature (≥120 °C) are (11 and (20 oriented, respectively. The different crystal growth mode leads to quite different film morphology. Compared with spin-coating, drop-casting shows much bette
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