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) (CsPbBr 3 ) with a semiconductor plasmonic QD (In-doped CdO) heterostructure using digestive ripening. The synthesized heterostructure shows significant improvement in QY over undoped CsPbBr 3 '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.

Lead halide perovskite (CsPbX3, where X = Cl, Br, or I) quantum dots (QDs), with tunable optical and electronic properties, have attracted attention because of their promising applications in solar cells and next-generation optoelectronic devices. Hence, it is crucial to investigate in detail the fundamental size-dependent properties of these perovskite QDs to obtain high-quality nanocrystals for practical use. We propose a direct method for determining the concentration of solution-processed CsPbX3 QDs by means of spectrophotometry, in which the molar absorption coefficient (ε) is obtained using absorption and the Beer–Lambert law. By tuning the size of CsPbX3 QDs, we obtain their corresponding ε leading to a calibration curve for calculating the nanocrystal concentrations. The ε at the band edge for CsPbX3 (X = Cl, Br, or I) nanocrystals was found to be strongly dependent on the bandgap of the nanocrystals. We also obtained a reliable size dependence of the bandgap calibration curves to estimate the size of QDs from the absorption spectra.

Optical and electronic properties of lead halide perovskite nanocrystals have been explored extensively for their increasing demand in photovoltaic and optoelectronic applications. But little is known about the growth kinetics...