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Lattice Disorder-Engineered Energy Splitting between Bright and Dark Excitons in CsPbBr3 Quantum Wires.

Huaiyi DingMei LiuNan PanYiyun DongYue LinTaishen LiJiangtao ZhaoZhen-Lin LuoYi LuoXiaoping Wang
Published in: The journal of physical chemistry letters (2019)
Excitons in nanostructured semiconductors often undergo strong electron-hole exchange interaction, resulting in bright-dark exciton splitting with the dark exciton usually being the lower energy state. This unfavorable state arrangement has become the major bottleneck for achieving high photoluminescence quantum yield (PLQY). However, the arrangement of dark and bright exciton states in lead halide perovskites is under intense debate due to the involvement of many complicated factors. We present here the first experimental evidence to demonstrate that the strain is a crucial factor in tuning the energy splitting of the bright and dark excitons, resulting in different PL properties.
Keyphrases
  • energy transfer
  • solar cells
  • light emitting
  • quantum dots
  • molecular dynamics
  • perovskite solar cells