Fig. 4: Competitive advantages of AIGS-AGS NCs and their application to LSC.
a Mass extinction coefficients, b representative PL spectra in individual NC level, and c FWHM statistics of AIGS-AGS, ZnSeTe–ZnSeS, and InP-ZnSeS NCs. The inset in (a) shows pump-fluence-dependence of the single exciton PL intensities to gain optical absorption cross-sections (σ) of NCs @ 450 nm (σ = 8.15, 6.54, and 1.58 (10−15 cm2) for AIGS-AGS, ZnSeTe–ZnSeS, and InP-ZnSeS NCs, respectively). Single exciton PL amplitudes from pump-fluence dependence measurements are fitted based on Poisson statistics of photon absorption to gain optical cross-sections. The PL spectra in (b) are fitted with single Lorentzian function and normalized by their integrated areas. The box-and-whisker plots in (c) represent the distribution of the data. (n = 103, 71, and 31 for AIGS-AGS, InP-ZnSeS, and ZnSeTe–ZnSeS, respectively). The insets in (c) display the band alignment of each heterostructured NC and the electron-hole overlap integral (θe-h). d Schematic and photographic image of a LSC, whose size is 100 × 50 × 10 mm3. The incident photons from top of LSC (50 × 100 mm2) are absorbed, re-emitted, and waveguided to the edge-mounted solar cell (50 × 10 mm2). Here, the geometric factor of LSC is 10, and light source is 420 nm LEDs. Scale bar in (d) is 10 mm. e Current-voltage characteristics of edge-mounted c-Si cells with 0.1 and 0.4 mg mL−1 of AIGS-AGS (circle) or InP-ZnSeS (triangle) NC solutions. f ηopts of LSCs with varying concentrations of AIGS-AGS and InP-ZnSeS NC solution (exp.) with a theoretical simulation (sim.)42. Improved light absorption of AIGS-AGS NCs allows us to obtain higher efficiency of LSC with reduced NC concentrations or film thicknesses. Synthesis and characteristics of ZnSeTe–ZnSeS and InP-ZnSeS NCs are detailed in “Methods" and Supplementary Fig. 18. Source data are provided as a Source data file.
