REPRODUCIBLE THERMISTOR REFINEMENT PROGRAM
Abstract
Gold-doped monocrystalline silicon exhibits temperature-resistivity behavior suitable for making highly reproducible, predictable and sensitive thermistors. Two types of thermistors were developed with reproducibilities of =2% and operable ranges including -85 to 200 C. Manufacturing methods were developed and demonstrated on an un balanced pilot line. Many elements were screened as possible silicon thermistor dopants. These include gold, copper, silver, nickel, iron, zinc, platinum, manganese, and thallium. Only gold in both P- and N-type silicon gave products suitable for use in the -85 to 200 C range. Gold-doped N-type silicon produces a high resistivity therm istor material with nearly linear log rho vs 1/T response in the range -85 to 200 C. This mate rial has a temperature coefficient of resistivity of -7% per degree at 25 C. It is most suitable for high temperature, narrow range, high sensi tivity applications. Gold-doped P-type silicon is a lower resistivity thermistor material with linear log rho vs 1/T behavior over the range of -85 to about 50 C. The temperature coefficient of resistivity of this material is -4.5% per de gree at 25 C. Forming of ohmic and mechanically strong contacts to the thermistor silicon is extremely important. Stability of the thermistors is very dependent upon these contacts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1963
- Accession Number
- AD0407792
Entities
People
- E. M. Glocker
- J. E. Herrera
- M. C. Vanik
- M. G. Sanchez
- W. T. Barrett