>Energy on the earth 1.78 billion kilowatts of solar energy radiated to the earth every year, Could-be used energy:only 50 to 100 billion kWh 、 Front alectrode(-) Sunlight Anti-reflection coating ype silicon (P号 P-type silicon (B-) Back electrode(+) Current BUT strongly rely on the Light intensityEnergy on the earth 2.01.78 billion kilowatts of solar energy radiated to the earth every year, Could-be used energy: only 50 to 100 billion kWh BUT strongly rely on the Light intensity