Assertion: silicon's quality | /r/HasProperty | poor
Facets:
Source sentences:
text: a-SiC alloy was considered to be a good candidate for the top cell because of its wider bandgap, but in spite of many years of effort, the material quality and stability are poor.
text: a-SiC alloy was considered to be a good candidate for the top cell because of its wider bandgap, but in spite of many years of effort, the material quality and stability are poor.
text: However, the quality and size of the crystals that were produced by these early efforts were poor.