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Typical I - V curves under nominally full Sun at three representative tilt angles are shown in Fig. 3. The mechanisms of. Light absorption and current generation in a solar cell have been recently described by Feldman.5 In short incident photons,, Excite electrons which experience, electric drift across the junction of a semiconductor diode. When an external circuit. Is present the motion, of charge has the capacity to deliver power to a load. The relationship between current and voltage. Generally follows the Shockley diode equation with an additional illumination-dependent current source. 6 Maximum current. Is generated when the solar panel is perpendicular to the incident light rays which occurred, with the panel tilted approximately. 30 ° from vertical during the measurements presented in Fig. 3. When the panel is adjusted to an angle θ away from the optimal. Orientation the incident, flux is reduced by a factor of cos θ 7 A small increase in reflection loss may also contribute. To the reduction of power generation as θ is increased. Differences between the measured and expected current shown in Fig. 3 May. Be attributed to atmospheric variations in the solar flux (i.e, variable cloud cover).
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