Question: why is insb a semiconductor?
Answer: Indium antimonide (InSb) has the smallest band gap of any of the III–V semiconductors (E o∼0.18 eV at 300 K, Ref. [1]). InSb is, thus, an interesting semiconductor for use in long-wavelength optoelectronic device applications. Its relatively high electron mobility (μn∼7×104 cm2/V-s at 300 K, Ref.