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Controlling the carrier polarity and concentration underlies most electronic and optoelectronic devices. However, for the intensively studied lead halide perovskites, the doping tunability is inefficient. In this work, taking CsPbBr3 as an example, it is revealed that the coexistence of metallic Pb or CsBr3/Br2, rather than the precursor ratio, can provide Pb‐rich/Br‐poor or Br‐rich/Pb‐poor chemical...
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