Fine-grain pyroelectric detector material and method

Details Fine-grain pyroelectric detector material and method Fine-grain pyroelectric detector material and method

1994-02-18

1995-07-18

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

H01L 310264, G01J 500

Patent

active

054344107

ABSTRACT:
An improved pyroelectric material comprises a polycrystalline material doped with at least one donor element such that the polycrystalline material has a grain size less than 10 .mu.m (or 5 .mu.m) and a Figure of Merit greater than 90 nC/(cm.sup.2* K). In the preferred embodiments the polycrystalline material is barium strontium titanate or calcium-substituted barium strontium titanate. The donor element may be Nb, Ta, Bi, Sb, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er or a combination thereof. The material may additionally be doped with an accepter such as Co, Cu, Fe, Mn, Ru, Al, Ga, Mg, Sc, K, Na, U, In, Mg, Ni, Yb or a combination thereof to control the resistivity. Other structures and methods are also disclosed.

REFERENCES:
patent: 4740700 (1988-04-01), Shaham et al.
patent: 4983839 (1991-01-01), Deb
patent: 5130542 (1992-07-01), Sibbald et al.

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