New measurements are presented of the interband absorption edge, in the range 0.01 to 100 cm-1, for uncompensated n-type InSb obtained using a photo-Hall technique. A spectral Urbach edge is observed in the range of sample temperature (20 to 77 K) and it is shown that the form of the experimental results derives from a broadening due to the interaction of acceptor impurity states. A phonon-assisted component is also identified at sample temperatures above 40 K.
|Number of pages||7|
|Journal||Physica Status Solidi B - Basic Research|
|Publication status||Published - Sep 1988|