Assertion: solar cell's layer | /r/HasProperty | an n-type
Facets:
Source sentences:
text: Traditionally, a solar cell has two layers: an n-type with a high concentration of electrons, and a p-type with a relatively low concentration of electrons.
text: A solar, or photovoltaic, cell is a two-layer sandwich of silicon; one layer, called N-type, contains traces of elements such as arsenic to give the material a negative electric charge; the second layer, called P-type, is laced with other elements that give a positive charge.