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Question:

The working principle of solar cells includes the three processes

The working principle of solar cells includes the three processes

Answer:

The solar cells absorb photons with a certain energy and excite unbalanced carriers (photogenerated carriers) - electron - hole pairs. These electrons and holes should have sufficient life, and they will not disappear after they are separated.
The opposite of the electrical symbol of the photogenerated carriers in the solar cell pn junction built under the action of the electric field, the electron-hole pairs are separated, the electrons are concentrated on one side, the holes are concentrated on the other side, and the opposite sex charges are generated on both sides of the pn junction Of the accumulation, resulting in photogenerated electromotive force, that is, photovoltaic voltage.
In the solar cell pn junction on both sides of the lead-out electrode, and connected to the load, then in the external circuit that is generated by the photogenerated current to obtain power output, so that solar cells put solar (or other light) directly into electrical energy

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