Semiconductor materials suitable for being used in radiation detectors are disclosed. A particular example of the semiconductor materials includes tellurium, cadmium, and zinc. Tellurium is in molar excess of cadmium and zinc. The example also includes aluminum having a concentration of about 10 to about 20,000 atomic parts per billion and erbium having a concentration of at least 10,000 atomic parts per billion.
STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH
 This work was partially funded by the Department of Energy (DE-FG07-06IDI4724), and the United States government has, therefore, certain rights to the present invention.