Fig. 1. High-resolution XRD pattern of the epilayers

Fig. 2. AFM image of the epilayers of the TPV devices

Fig. 3. Structure of the GaSb TPV

Fig. 4. Electrode shapes of different GaSb TPV cells. (a) A grating electrode; (b) A simple electrode

Fig. 5. Dark I-V curve of the GaSb TPV cells 1 cm×1 cm dimensions

Fig. 6. I-Vcurve of the GaSb TPV cells under solar simulation

Fig. 7. P-Vcurve of the GaSb TPV cells under solar simulation

Fig. 8. Open-circuit voltage and the short-circuit current density of the TPV cell with a grating electrode

Fig. 9. Open-circuit voltage and the short-circuit current density of the TPV cell with a simple electrode

Fig. 10. Comparisons of the short-circuit current density versus the open-circuit voltage for the TPV cells

Fig. 11. Fill factor of the GaSb TPV cells