A 3 Volts source AAA Battery charger

Good days everyone!

I'm Planning to design a solar robot car. The solar panel output is 3V @ 3Watts that will charge up a 2 AAA batteries that will run the motor.

My problem is that i don't know what type/kind of circuit I need to use to be the "charging circuit" for the battery.

Help everyone...i need an efficient and fast charging circuit design that will charge the 2 AAA batteries and the input source is 3V @watts solar panel...

Thanks.... and more Power!


flow :
SOLAR PANEL(3V@3Watts)----CHARGING CIRCUIT----2 AAA BATT----MOTOR