switches - How to activate a pn2222 transistor with very low voltage

How to activate a pn2222 transistor with very low voltage 0.15 volts or 150 mV from a small dc can motor Generator. I would like the Transistor to turn on as soon as the generator starts producing current. the problem I had is the Power source is running back through the Transistor and spinning the Motor/Generator. I want the Generator to give power to the base of the Transistor to activate some LEDs. This is a small 6 volt can motor as a wind generator. I also tried a 3A Solid state Relay but it needs conrtol voltage at least 3 v. Would it be reasonable to try a Ge transistor instead of the Si one .

Thanks