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This strong wavelength dependence of responsivity makes cell performance in turn
strongly dependent on the spectral content of sunlight. In addition, optical and
recombination losses mean that actual cells can only approach these ideals.
Figure 3.7. Bandgap limitations on the quantum efficiency of silicon solar cells.
Figure 3.8. The quantum limit of spectral responsivity as a function of wavelength.
3.3 EFFECT OF TEMPERATURE
The operating temperature of a solar cell is determined by the ambient air
temperature, by the characteristics of the module in which it is encapsulated (see
Section 5.8), by the intensity of sunlight falling on the module, and by other variables
such as wind velocity.
The dark saturation current I 0 increases with temperature according to the equation
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