ELECTRICAL CONTACTS TO CADMIUM SULFIDE SINGLE CRYSTALS.
DELAWARE UNIV NEWARK DEPT OF PHYSICS
Pagination or Media Count:
It is well known that at room temperature ohmic-behaving electrical contacts to CdS single crystals can easily be attained. However, at temperatures greater than 100C such contacts exhibit instability e.g., diffusion of indium into the bulk of the crystal above 100C where, acting as a donor, it may dominate crystal behavior. A multilayer technique has been developed which permits evaporated electrodes to perform ohmically up to 300C. This technique is characterized by the usage of a preparative metal to clean the surface of the crystal to be electroded, an active metal to serve as the ohmic-behaving electrical contact, and a covering metal to carry current and act as a diffusion sink. Although in half the cases a heat treatment of the multilayer-crystal system is necessary to create an ohmic-behaving contact, the results using titanium as the preparative metal and aluminum as the active metal have been completely successful. Author
- Solid State Physics