Category Nuances for polycrystalline_silicon:

• peripheral,
• conductive,
• inert,
• expensive,
• crystalline,
• promising,
• basic,
• elementary,
• traditional,
• stock,
• chemical,
• convenient,
• conventional,
• polycrystalline,

Simple Categories for polycrystalline_silicon:

• substance,
• material,
• contamination,
• semiconductor,
• silicon,