Local Surface Plasmon-Assisted Metal Oxide Perovskite Heterostructure for Small Light Emitters

Efficient photonic and plasmonic response within a single material without the decay of either property is a challenge that applications such as surface lattice resonance (SLR)-assisted spontaneous emission and absorption demand. Metalbased heterostructures with strong spectral overlap do not show any promise for retention of both properties. In this work, we highlight the use of semiconductor plasmonic structures with no spectral overlap between the plasmonic feature and the host excitonic transition. However, quantum yield (QY) enhancement is achieved by intercalating an appropriate semiconductor plasmonic material with a spectrally overlapping band edge transition. We report the synthesis of perovskite quantum dots (QDs) (CsPbBr₃) with a semiconductor plasmonic QD (In-doped CdO) heterostructure using digestive ripening. The synthesized heterostructure shows significant improvement in QY over undoped CsPbBr₃’s while retaining a similar LSPR quality factor with a high free carrier density to that of In−CdO QDs, providing a cost-effective alternative for SLR applications.

https://doi.org/10.1021/acs.jpcc.1c03577