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How do photovoltaic cells work?

When sunlight strikes a solar cell, electrons are knocked loose. They move toward the treated front surface. An electron imbalance is created between the front and the back. When a connector, like a wire, joins the two surfaces a current of electricity occurs between the negative and positive sides. These individual solar cells can be arranged together in a PV module and modules can be grouped together in an array. Some arrays are set on special tracking devices to follow sunlight all day long.