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Metal halide perovskites have revolutionized the development of highly efficient, solution‐processable solar cells. Further advancements rely on improving perovskite film qualities through a better understanding of the underlying growth mechanism. Here, a systematic in situ grazing‐incidence X‐ray diffraction investigation is performed, facilitated by other techniques, on the sequential deposition...
In article number 1902319, featuring a synchrotron‐based in situ X‐ray diffraction technique, Gang Chen and co‐workers investigate the sequential deposition process of FAPbI3 from a smooth PbI2 film to a trilayer PbI2‐FAI composite film and finally to the oriented perovskite film. The effects of the additive ions of Br−, Cl−, and MA+ on the crystallization dynamics and grain orientation of the resultant...
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