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Herein, we describe simple, fast and reproducible halide ion exchange reactions in CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) at room temperature. Through the simple adjustment of the halide ion concentration, the photoluminescence of these NCs can be tuned over the entire visible region (425-655 nm). Photodetector devices based on entirely inorganic CsPbI3 NCs are demonstrated for the first time. The photodetectors exhibited a good on/off photocurrent ratio of 10(5).


Ramasamy, Parthiban;  Lim, Da-Hye;  Kim, Bumjin;  Lee, Seung-Ho;  Lee, Min-Sang;  Lee, Jong-Soo

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