Assertion: solar cell's layer | /r/HasProperty | two p-n junctions
Facets:
Source sentences:
text: When only two layers (two p-n junctions) are combined, it is called a tandem-cell.
text: This type of solar cell is known as a single-junction solar cell, as it has one single boundary/junction between the n-type and p-type layers, known as a p-n junction.