Shell formation of halide perovskite nanoparticles to prevent anion exchange

摘要

A core / shell type semiconductor nanoparticle structure includes a core including a halide perovskite semiconductor and a shell including a semiconductor material that is not halide perovskite (and is substantially free of halide perovskite). The halide perovskite semiconductor core may be of the formula AMX3, where A is an organic ammonium such as CH3NH3 +, (C8H17) 2 (CH3NH3) +, PhC2H4NH3 +, C6H11CH2NH3 + or 1-adamantyl methyl ammonium, an amidinium such as CH (NH2) 2+, Alternatively, it is an alkali metal cation such as Li +, Na +, K +, Rb +, or Cs +. M is a divalent metal cation such as Mg2 +, Mn2 +, Ni2 +, Co2 +, Pb2 +, Sn2 +, Zn2 +, Ge2 +, Eu2 +, Cu2 + or Cd2 +, and X is a halide anion (F-, Cl-, Br-, I-). -) Or a combination of halide anions. [Selection diagram] Fig. 1