Electrical and Optical Properties of Intermetallic Compounds. III. Aluminum Antimonide

Measurements of resistivity, Hall coefficient, and optical absorption of AlSb are reported. The width of the forbidden energy band, derived from electrical and optical data, is 1.6 ev at absolute zero. Absorption bands are observed at 0.75 ev in $p$-type samples and at 0.31 ev in tellurium-doped $n$-type specimens. An energy level diagram with several acceptor and donor levels in the forbidden energy band is suggested to explain these observations.