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Recently, the emerging inorganic perovskites CsPbX3 (X = Br, I) have received great attention in the photovoltaic community due to their excellent photoelectric property and good thermal stability. However, most of the reported CsPbX3 films are fabricated by the uncontrolled solution method, and it is challenging to generate pinhole-free Br-rich films due to the over-rapid liquid-phase reaction feature...
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