I ordered these solar cells from Sparkfun.com. This little thing can generate
up to 4V when it exposed to the sun, but unfortunately it has tooooooo! low
current. Thus, I can’t not make this to power up anything, not even single LED.
So, I have to go plan B, which I don’t have… lol, or try to connect series of them,
and hope it to create enough current to run my tiny motor.  

Update:
I had an experimental with Elio in the sensor lab to find way to store little current
that solar cell generating.
Well, it turnes out that I can use this super capacitor to discharge current only
when it is charged manually from 3v source, while solar cell generates little
current. However, current that solar cell generating is too small that it cannot
charge the capacitor when all the current of capacitor is fully discharged. 
Thus, I will not use this solar cells for this project, but it is worth it to explore
and experiment with it.