Figure 2: Thermodynamic power conversion and optical thermal up-conversion efficiency (EQEup) limits for the two-source configuration. | Nature Communications

Figure 2: Thermodynamic power conversion and optical thermal up-conversion efficiency (EQEup) limits for the two-source configuration.

From: A hot-electron thermophotonic solar cell demonstrated by thermal up-conversion of sub-bandgap photons

Figure 2

(a) Globally optimized thermodynamic power-conversion efficiency limit for the two-source configuration (red region) compared with the Shockley–Queisser efficiency as a function of the solar concentration factor. (b) Thermal up-conversion efficiency under solar (blue region) and high-intensity laser (red region) illumination for a fixed solar cell bandgap (1,000 nm) as a function of the solar collector bandgap. The red lines indicate the reduction in EQEup as cooling coefficient Q increases. All simulations are performed in the far-field limit with the exchange of fluxes occurring inside the semiconductor with refractive index 3.5 and assuming the top solar cell has bandgap Eg=1.24 eV.

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