Assertion: solar cell's electron | /r/CapableOf | become excited
Facets:
Source sentences:
text: When the cathode is heated to a high temperature, electrons become excited, jump across the thin vacuum to the relatively cold anode, and drive a current through an external circuit back to the cathode.
text: When sunlight hits the top semiconductor, the loose electrons become excited, are knocked loose, and then attracted to the positive layer beneath.