You should not charge your phone directly with solar cells.
If you want to use solar cells to charge your cell phone, you must first make the solar cells into solar cell components with charging functions. This rechargeable component includes at least one solar cell and a USB current output interface with voltage stabilization function.
I think you were originally talking about a component that had a loading function, correct?
To use such a battery component to charge a mobile phone, a condition must be met, that is, the output current and voltage of the battery component must meet the requirements of charging the mobile phone. have very high charging current and voltage requirements.
Smartphones can use solar cells, but this application method cannot be promue on mobile phones.
Most cell phones are used indoors, in a cool place or in a pocket. Who have you seen playing with their cell phone in the sun? Even if there are, they are for a very small number of individuals and are not suitable for large groups.