Quantum efficiency and temperature coefficients of GaInP/GaAs dual-junction solar cell
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- Liu, L., Chen, N., Bai, Y. et al. Sci. China Ser. E-Technol. Sci. (2009) 52: 1176. doi:10.1007/s11431-008-0203-9
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GaInP/GaAs dual-junction solar cell with a conversion efficiency of 25.2% has been fabricated using metalorganic chemical vapor deposition (MOCVD) technique. Quantum efficiencies of the solar cell were measured within a temperature range from 25 to 160°C. The results indicate that the quantum efficiencies of the subcells increase slightly with the increasing temperature. And red-shift phenomena of absorption limit for all subcells are observed by increasing the cell’s work temperature, which are consistent with the viewpoint of energy gap narrowing effect. The short-circuit current density temperature coefficients dJsc/dT of GaInP subcell and GaAs subcell are determined to be 8.9 and 7.4 μA/cm2/°C from the quantum efficiency data, respectively. And the open-circuit cell voltage temperature coefficients dVoc/dT calculated based on a theoretical equation are −2.4 mV/°C and −2.1 mV/°C for GaInP subcell and GaAs subcell.