Mini/electrics problem
Yes, but the current that you can draw will be the lowest of the currents the two sources can supply. 

I have the strong suspicion that your 9V and 2V are open voltages (= with no load) that will fall off sharply when you try to draw current.

Note that solar panels are generally specified by their open voltage, and by their shorted current. So a 10V 1A solar panel behaves (more or less) like a 10V source with a 10 Ohm series resistor. The highest amount of power you can draw from it (with a 10 Ohm load) is 5V * 0.5A = 2.5 Watt, not the 10V * 1A = 10 Watt you might expect from the specs. 

And on top of that, the specs are always for direct sunlight in Death Valley, which probably does not match your local conditions.