What are the performance parameters of silicon solar cells?
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.
(1) Short circuit current
The current when the positive and negative electrodes of the solar cell are short-circuited is called the short-circuit current of the cell, and the short-circuit current changes with the change of light intensity.
(2) Open circuit voltage
The positive and negative poles of the solar cell are not connected to the load. At this time, the voltage between the positive and negative poles of the solar cell is the open circuit voltage. The open circuit voltage of a monolithic solar cell does not change with the increase or decrease of the cell area, generally 0.5 to 0.7V.
(3) Peak current
The peak current refers to the optimal working current when the solar cells output the maximum power.
(4) Peak voltage
The peak voltage refers to the working voltage when the solar cells output maximum power. The peak voltage does not change with the increase or decrease of the cell area, generally 0.48V.
(5) Peak power
The peak power refers to the maximum output power of the solar cell under normal working or test conditions, that is, the best output power, that is, the product of the peak current and the peak voltage. The peak power of the solar cell depends on the solar irradiance, the solar spectral distribution and the operating temperature of the cell, so the standard conditions for the measurement of the solar cell are: the irradiance is 1kW/m², the air quality is AM1.5, and the temperature is 25 ℃.
(6) Fill factor (FF)
The fill factor is also called the curve factor, which refers to the ratio of the maximum output power of the solar cell to the product of the open circuit voltage and short circuit current. Fill factor is an important parameter for evaluating the output characteristics of solar cells. The higher its value, the more rectangular the output characteristics of solar cells, and the higher the photoelectric conversion efficiency of the cells. The coefficient of the fill factor is generally between 0.5 and 0.8, and it can also be expressed as a percentage.
(7) Conversion efficiency
Conversion efficiency refers to the ratio of the maximum output power of a solar cell when exposed to light to the solar energy irradiated on the cell, namely:
η=peak power of the cell/cell area×power of incident light per unit area
These are the performance parameters of silicon solar cells.
You can learn more about solar cells.