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Mobile defects as mediated states for charge-carrier trapping in metal halide perovskites quantum dots

Xiao-Yi LiuWei-Ping LiYu Cui ...+3 Zi-Wu Wang
Dec 2022
摘要
The migration motion of defects in metal halide perovskites quantum dots(MHPQDs) results in charge-carrier trapping become more complicated. We studytwo-step trapping mediated by mobile defects between the ground state of MHPQDsand a fixed-depth defect using a full-configuration defect method, where allpossible trapping processes mediated by these mobile defects could bereproduced and the fastest channels among them are picked out. We find thatthese two-step trapping processes could keep more one order of magnitude fasterthan these direct ones as mobile defect with the appropriate localizationstrength, which implies that these indirect trapping should play the crucialrule to determine the non-radiative recombination losses. These results providethe significant explanation for studying non-radiation processes of carriers inthe presence of the migration defects in recent experiments. Moreover, thismodel will be available to analyze some key performance related defects inelectronic devices.
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