Fig. 3: Impact of AGS heteroepitaxy on photophysical and photochemical properties of individual AIGS-AGS NCs. | Nature Communications

Fig. 3: Impact of AGS heteroepitaxy on photophysical and photochemical properties of individual AIGS-AGS NCs.

From: Coherent heteroepitaxial growth of I-III-VI2 Ag(In,Ga)S2 colloidal nanocrystals with near-unity quantum yield for use in luminescent solar concentrators

Fig. 3

a Representative PL intensity trajectories (left) and PL intensity histograms (right) of AIGS-AGS NC (top, cyan) versus AIGS core (bottom, gray) (bin time = 50 ms). b On-time fraction statistics of individual AIGS-AGS NCs (left, cyan) and AIGS cores (right, gray). Average on-times are 63.9% and 12.3% for AIGS-AGS NCs and AIGS cores, respectively. The error bars in (b) represent the standard deviation (n = 64 and 27 for AIGS-AGS and AIGS core, respectively). c Emission spectra from 1Se−1Sh transition (bottom, AIGS-AGS NC) and surface trap states (top, AIGS core). The composition and dimensions are X = 0.5, r = 1.8 nm, and l = 0 or 1.6 nm for AIGS cores or AIGS-AGS NCs, respectively. The insets depict luminescence mechanism and its characteristic time. d PL maximum versus FWHM distribution in individual AIGS-AGS NCs or AIGS cores. e Time-dependent PL QYs of AIGS (X = 0.5, r = 1.8 nm)-AGS NCs with varying shell thicknesses (l = 0.6, 1.2, 1.6, or 2.9 nm) upon oxidative test. The inset displays T50, the time when PL QY reaches to the half of initial values. See Supplementary Fig. 17 for detailed optical characteristics (exciton lifetimes and g(2)(t)) of individual NCs. Source data are provided as a Source data file.

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