Assertion: silicon | /r/HasAspect | impurity
Facets:
Source sentences:
text: To address this issue, the silicon in a solar cell has impurities -- other atoms purposefully mixed in with the silicon atoms -- which changes the way things work a bit.
text: To address this issue, the silicon in a solar cell has impurities—meaning that other atoms are purposefully mixed in with the silicon atoms in order to improve silicon’s ability to capture the sun’s energy and convert it into electricity.