noun
photovoltaic cell; solar cell; photocell
Technical term in electronics and physics for a device that converts light into electricity. 太陽電池 is a common synonym for solar cells.
この光電池は太陽光を効率よく電気に変える。
This photovoltaic cell efficiently converts sunlight into electricity.
Small chargers using photocells are on sale.
Compound of 光 (light) and 電池 (battery/cell), literally 'light battery'.