Fig. 1. Irreversible thermodynamic model of PV cells^[13]

Fig. 2. Different performance curves. (a) Relationship between T_p and V under different radiation intensities; (b) relationship between V_OC and G; (c) relationship between I_SC and G

Fig. 3. Relationship between η and V under different radiation intensities

Fig. 4. Three-dimensional surface graphs in different situations. (a) P; (b) η

Fig. 5. Performance under different radiation intensities after optimizing V and I. (a) η_opt and P_opt; (b) V_opt and I_opt

Fig. 6. Schematic of PV-thermal coupling system