Patent ID: 8247684

Claim:
A method for generating electric power with a solar cell, the method comprising steps of: a step (a) of preparing the solar cell comprising: a graphite substrate; an amorphous carbon layer formed on the graphite substrate by oxygen-ashing treatment; an AlN layer formed on the amorphous carbon layer; a n-type nitride semiconductor layer formed on the AlN layer; a light-absorption layer comprising a nitride semiconductor layer formed on the n-type nitride semiconductor layer; a p-type nitride semiconductor layer formed on the light-absorption layer; a p-side electrode electrically connected to the p-type nitride semiconductor layer; and an n-side electrode electrically connected to the n-type nitride semiconductor layer; wherein the amorphous carbon layer has a thickness of not less than 20 nanometers and not more than 60 nanometers; and a step (b) of irradiating the solar cell with sunlight to generate the electric power between the p-side electrode and the n-side electrode.