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Hg1−xCdxTe or mercury cadmium telluride is a chemical compound of cadmium telluride and mercury telluride with a tunable bandgap spanning the shortwave infrared to the very long wave infrared regions. The amount of cadmium in the alloy can be chosen so as to tune the optical absorption of the material to the desired infrared wavelength. CdTe is a semiconductor with a bandgap of approximately 1.5 electronvolts at room temperature. HgTe is a semimetal, which means that its bandgap energy is zero. Mixing these two substances allows one to obtain any bandgap between 0 and 1.5 eV.
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