In figure 5 the maximum power of a solar cell is given. Which physical size does have an influence?
Of course, the light intensity has an influence on the maximum power of a solar cell.
What is the maximum power you could get out of the solar cell?
Please see figure 6. The power maximum at the given light conditions is about 19.5mW.
How is the function called to keep the output Power at the maximum level? (Tip see ADP5091)
MPPT – Maximum power point tracking
This function ensures you are getting always the maximum possible power out of a solar cell. The maximum power might be different based on the light conditions - MPPT ensures it will be always at the maximum possible.