PROPERTIES OF THICK EVAPORATED LAYERS OF PbTe

Abstract

RBsumB. -La transparence optique des couches monocristallines de PbTe peut varier aprb un traitement thermique suivant l'evaporation. Les monocouches ont quelques microns d'epaisseur et le recuit fait dkroitre la densite de porteurs d'environ 10lscm-3 (type n) B 10 17 cm-3 : le materiau de la source est B 1019cm-3 (typep). Le processus semble faire intervenir la diffusion de 0 2 a un taux de reaction correspondant a une energie de 0,83 eV.Abstract. -The changes in the optical transparency of PbTe monolayers induced by post-evaporation heat treatment are described. The monolayers are typically a few microns in thickness and heat treatment reduces the carrier density from about 1018 (n-type) per cm3 to 1 0 1 7 per cm3 : the source material is 1019 (p-type) per cm3. The process seems to involve the diffusion of 0 2 at a reaction rate equivalent to an energy of 0.83 eV.

Increments at the Interface between Layers during Infra-red Filter Manufacture

“…These are (a) PbTe layers are superior in refractive index ratio to all other known thin film materials [1], n,,, being 5 . 74 [2], and are self-blocking against shortwave radiation by virtue of photoconductive absorption [3] ;…”