Strategic integration of 2D perovskite and chiral quantum dot hybrid heterostructures for superior CPL detection

Circularly polarized light（CPL） detection has garnered significant research interest due to its extensive applications in optoelectronics and quantum communication.Chiral perovskites possess CPL detection capabilities due to their inherent chirality.However,incorporating organic amine spacers distorts the crystal lattice,resulting in defects that reduce the sensitivity of CPL detectors.This study introduces the concept of chiral superposition for the first time,reporting two mixed heterostructures composed of two-dimensional（2D） chiral perovskite（R/S-MBA）2MAPb2I7（R/S）,chiral quantum dots（R/S-MBA）-CsPbBr3（R/SQD）,and chiral carbon dots（Ch-CDs）.The addition of chiral quantum dots/Ch-CDs fills the defects of the chiral perovskite films and reduces the electron-hole recombination rate in chiral hybrid perovskites,thereby significantly enhancing the circularly polarized sensitivity of the CPL detector.By adjusting the concentration of chiral quantum dots,controllability of spin electron transfer is achieved,which has a notable impact on circular dichroism（CD） and anisotropy factor glhp.The anisotropy factor glhpof the mixed heterostructure R/S-R/SQD is approximately 21.58 times higher than that of single-phase chiral perovskites,and the asymmetry factor gCDincreases tenfold.Thus,this work opens up a new effective pathway for achieving high-sensitivity CPL detection,with promising applications in optoelectronic technologies such as spin information communication and quantum optics.