Detailed Balance Limit of Efficiency of <i>p-n</i> Junction Solar Cells
Tóm tắt
In order to find an upper theoretical limit for the efficiency of p-n junction solar energy converters, a limiting efficiency, called the detailed balance limit of efficiency, has been calculated for an ideal case in which the only recombination mechanism of hole-electron pairs is radiative as required by the principle of detailed balance. The efficiency is also calculated for the case in which radiative recombination is only a fixed fraction fc of the total recombination, the rest being nonradiative. Efficiencies at the matched loads have been calculated with band gap and fc as parameters, the sun and cell being assumed to be blackbodies with temperatures of 6000°K and 300°K, respectively. The maximum efficiency is found to be 30% for an energy gap of 1.1 ev and fc = 1. Actual junctions do not obey the predicted current-voltage relationship, and reasons for the difference and its relevance to efficiency are discussed.
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Tài liệu tham khảo
1959, RCA Rev., 20, 373
1960, Proc. I.R.E., 48, 1246
1960, Bull. Am. Phys. Soc., 5, 160
1957, Z. Astrophysik, 43, 95
1949, Rev. Sci. Instr., 20, 884
1957, Z. Physik, 148, 385
1959, Proc. Inst. Elec. Engrs. (London), 106, 908
1958, J. Tech. Phys. (U.S.S.R.), 28, 2115
1957, Proc. I.R.E., 45, 1228
1959, Bull. Am. Phys. Soc., 4, 409
1960, Bull. Am. Phys. Soc., 5, 160
1960, Proc. I.R.E., 48, 1259
1955, Proc. Phys. Soc. (London), B68, 319
1958, Proc. Roy. Soc. (London), A249, 16
1957, Proc. I.R.E., 45, 1535
1961, Bull. Am. Phys. Soc., 6, 106