Between 0.7 and 0.85. Fill factor is an important parameter for measuring solar cell performance, indicating the ratio of maximum output power to ultimate output power. The larger the fill factor, the better the performance of the solar cell. The average fill factor ff of monocrystalline silicon is between 0.7 and 0.85.
1. Open circuit voltage
Open circuit voltage UOC: That is, the solar cell is exposed to AM1.5 spectrum conditions and a light source intensity of 100 mW/. cm2, with open circuits at both ends. When, the output voltage value of the solar cell.
2. Short circuit current
ISC short circuit current: When the solar cell is exposed to AM1.5 spectrum conditions and a light source intensity of 100 mW/cm2, and the end output is short-circuited, the current valuet circulating through both ends of the solar cell.
3. Maximum output power
The operating voltage and current of the solar cell change with the load resistance. Plot the operating voltage and current values corresponding to different resistances. values. Obtain the volt-ampere characteristic curve of the solar cell. If the selected load resistance value can maximize the product of output voltage and current, the maximum output power can be obtained, represented by the symbol Pm. The working voltage and working current at this time are called optimal working voltage and optimal working current, which are represented by the symbols Um and Im, respectively.
4. Fill factor
Another important parameter of solar cells is the fill factor FF (fill factor), which is the ratio of the maximum output powerthe and the product of the open circuit voltage. and short circuit current.
FF: It is an important indicator for measuring the output characteristics of solar cells. It represents the characteristics of the maximum power that a solar cell can produce when supporting the optimal load. the output power of the solar cell. The value of FF is always less than 1. Series and parallel resistors have a greater impact on the fill factor. The larger the series resistance, the lower the short-circuit current and the lower the fill factor; the smaller the parallel resistance, the greater the partial current, which leads to a decrease in the open circuit voltage and the greater the filling. the factor decreases a lot.
5. Conversion Efficiency
The conversion efficiency of a solar cell refers to the maximum energy conversion efficiency whens that the optimal load resistance is connected to the external loop. It is equal to the output. power of the solar cell and the incident solar energy. The ratio of energy to battery surface area. The photoelectric conversion efficiency of solar cells is an important parameter for measuring the quality and technical level of the battery. It is related to the structure, junction characteristics, material properties, operating temperature, radioactive particle damage and environmental changes of the battery.