Assertion: germanium's compound | /r/HasProperty | germanium
Facets:
value: often
type: DEGREE
Source sentences:
text: However, the triple junction cells require the use of semiconductors that can be tuned to specific frequencies, which has led to most of them being made of gallium arsenide (GaAs) compounds, often germanium for the bottom-, GaAs for the middle-, and GaInP 2 for the top-cell.