Metal nitride material for thermistor, method for producing same, and film type thermistor sensor

Patent metadata

Field	Value
Publication number	US-9625326-B2
Application number	US-201414455541-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Aug 12, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

The metal nitride material for a thermistor consists of a metal nitride represented by the general formula: (M 1 - v A v ) x Al y (N 1-w O w ) z (where “M” represents at least one of Ti, V, Cr, Mn, Fe, and Co, “A” represents at least one of Sc, Zr, Mo, Nb, and W, 0.0<v<1.0, 0.70≦y/(x+y)≦0.98, 0.45≦z≦0.55, 0<w≦0.35, and x+y+z=1), wherein the crystal structure thereof is a hexagonal wurtzite-type single phase.

First claim

What is claimed is:

1. A metal nitride material for a thermistor, consisting of a metal nitride represented by the general formula: (M 1-v A v ) x Al y (N 1-w O w ) z (where “M” represents at least one of Ti, V, Cr, Mn, Fe, and Co, “A” represents at least one of Sc, Zr, Mo, Nb, and W, 0.0<v<1.0, 0.70≦y/(x+y) ≦0.98, 0.45≦z≦0.55, 0w≦0.35, and x+y+z=1), wherein the crystal structure thereof is a hexagonal wurtzite-type single phase.

2. The metal nitride material for a thermistor according to claim 1 , wherein the metal nitride material, is deposited as a film and is a columnar crystal, extending in a vertical direction with respect to the surface of the film.

3. The metal nitride material for a thermistor according to claim 2 , wherein the metal nitride material is deposited as a film and is more strongly oriented along a c-axis than an a-axis in a vertical direction with respect to the surface of the film.

4. A film type thermistor sensor comprising:
an insulating film;
a thin film thermistor portion made of the metal nitride material for a thermistor according to claim 2 on the insulating film; and
a pair of pattern electrodes formed at least on the top or the bottom of the thin film thermistor portion.

5. A method for producing the metal nitride material for a thermistor according to claim 2 , the method comprising:
a deposition step of performing film deposition by reactive sputtering in a nitrogen- and oxygen-containing atmosphere using an M-A-Al (where “M” represents at least one of Ti, V, Cr, Mn, Fe, and Co, and “A” represents at least one of Sc, Zr, Mo, Nb, and W) alloy sputtering target.

6. The metal nitride material, for a thermistor according to claim 1 , wherein the metal nitride material is deposited as a film and is more strongly oriented along a c-axis than, an a-axis in a vertical direction with respect to the surface of the film.

7. A film type thermistor sensor comprising:
an insulating film;
a thin film thermistor portion made of the metal nitride material for a thermistor according to claim 6 on the insulating film; and
a pair of pattern electrodes formed at least on the top or the bottom of the thin film thermistor portion.

8. A film type thermistor sensor comprising:
an insulating film;
a thin film thermistor portion made of the metal nitride material for a thermistor according to claim 1 on the insulating film; and
a pair of pattern electrodes formed at least on the top or the bottom of the thin firm thermistor portion.

9. A method for producing the metal nitride material for a thermistor according to claim 6 , the method comprising:
a deposition step of performing film deposition by reactive sputtering in a nitrogen- and oxygen-containing atmosphere using an M-A-Al (where “M” represents at least one of Ti, V, Cr, Mn, Fe, and Co, and “A” represents at least one of Sc, Zr, Mo, Nb, and alloy sputtering target.

10. A method for producing the metal nitride material for a thermistor according to claim 1 , the method comprising:
a deposition step of performing film deposition by reactive sputtering in a nitrogen- and oxygen-containing atmosphere using an M-A-Al (where “M” represents at least one of Ti, V, Cr, Mn, Fe, and Co, and “A” represents at least one of Sc, Zr, Mo, Nb, and W) alloy sputtering target.

Assignees

• Mitsubishi Materials Corp

Inventors

• Fujita Toshiaki
• Tanaka Hiroshi
• Nagatomo Noriaki

Classifications

• C30B29/605

  Products containing multiple oriented crystallites, e.g. columnar crystallites · CPC title

• H01C7/008

  Thermistors (H01C7/02 - H01C7/06 take precedence) · CPC title

• C30B25/06

  by reactive sputtering · CPC title

• C30B29/38

  Nitrides · CPC title

• H01C7/04

  having negative temperature coefficient · CPC title