Solar cells are devices that convert light energy into electrical energy. Light is a necessary condition for the functioning of solar cells. The intensity and spectrum of light directly affect the photoelectric conversion efficiency of solar cells. Solar Cells 1, Solar Energy The principle of operation of the battery is that photons are absorbed by the semiconductor and in the process carriers are generated: electrons and holes.
They diffuse towards the junction and the strong electrical energy The field inside the PN junction separates the electrons and holes, thus passing them outside. Voltage and current are generated in the electric field. A part of the photons directed towards the semiconductor is reflected by the semiconductor and a part is absorbed by the semiconductor. The semiconductor absorbs the energy of the photons with hγ>Eg. THESolar cells have certain requirements for the intensity of sunlight. If the light intensity is insufficient, the battery power output may not meet standards.
The performance parameters of silicon solar cells mainly include: short circuit current, open circuit voltage, peak current, peak voltage, peak power , fill factor and conversion efficiency, etc. ①Short circuit current (isc): When the positive and negative electrodes of the solar cell are short circuited and u = 0, the current at this time is the short circuit current of the cell. The unit of short circuit current is. ampere (a). The short circuit current changes with light intensity. ②Open circuit voltage (uoc): When the positive and negative electrodes of the solar cell are not connected to the load and i = 0, the voltage between the electrodesThe positive and negative voltages of the solar cell are the open circuit voltage. the open circuit voltage is volt (v). The open circuit voltage of a single solar cell does not change with increasing or decreasing the cell area and is generally 0.5 to 0.7 V. ③Peak current (im): the current of peak is also called maximum operating current or best operating current. Peak current refers to the operating current when the solar cell produces maximum power. The unit of peak current is ampere (a). ④Peak voltage (um): Peak voltage is also called maximum operating voltage or best operating voltage.