Photo Conducting Materials:



    Cadmium sulphide and cadmium selenide:

       It is used to make photo conductors with high dissipation capability and excellent sensitivity in visible spectrum.
  
  Lead sulphide:

        It is used to make commercial photo conductive cells and it is used in the infra red detection.

   Indium antimonide:

        It is used as infra red detector which detects waves upto 7 . It has melting point and can be produced as a single crystal.
   
Mercury cadmium telluride:

        The resistance of these devices is very low.

    Doped semiconductors:

        Zinc and boron doped germanium detectors has detecting range from 20 to 100 , but they require cooling upto 4K.
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