
A solar cell is made of , such as , that have been fabricated into a . Such junctions are made by one side of the device p-type and the other n-type, for example in the case of silicon by introducing small concentrations of or respectively. In operation, in hit the solar cell and are absorbed by the semic.

电气工程是以、等分支为基础,涵盖、、、、、、等子领域的一門。十九世紀後半期以來,隨著、、在供應與使用方面的商業化,該學科逐漸發展為相對獨立的專業領域。 電機工程廣義上涵蓋該領域的分支,但在有些地方,「电气工程」(英語:Ele.