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Lead mixed‐halide perovskites offer tunable bandgaps for optoelectronic applications, but illumination‐induced phase segregation can quickly lead to changes in their crystal structure, bandgaps, and optoelectronic properties, especially for the Br–I mixed system because CsPbI3 tends to form a non‐perovskite phase under ambient conditions. These behaviors can impact their performance in practical applications...
Charge carrier transport in materials is of essential importance for photovoltaic and photonic applications. Here, the authors demonstrate a controllable acceleration or deceleration of charge carrier transport in specially structured metal‐alloy perovskite (MACs)PbI3 (MA= CH3NH3) single‐crystals with a gradient composition of CsPbI3/(MA1−xCsx)PbI3/MAPbI3. Depending on the Cs‐cation distribution in...
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