Etude comparative des propriétés thermiques, électriques et optiques des verres du système argent-arsenic-sélénium

Abstract Thermal, electrical, and optical properties of glass compositions situated along the "As 2 Se 5 "-Ag 2 Se (region I), AsSe-Ag 2 Se, and AsSe-Ag (region II) lines are investigated and compared. For glass compositions of region I, the glass transition temperature ( T g ) and the electrical conductivity (σ) are weak ( T g = 375 ± 5 K and σ = 2,6 × 10 -7 cm -1 at 294 K for a 20% concentration of silver). For glass compositions of region II, T g and σ are higher ( T g = 420 ± 5K and σ = 8,1 × 10 -6 Ω; -1 cm -1 at 298 K for a 20% concentration of silver). All the glasses investigated are high-resistivity and wide-gap semiconductors since their optical gap is higher than 1.4 eV. With increasing Ag content in the glasses, T g is almost constant, the optical gap decreases slightly but the electrical conductivity increases, and the activation energy decreases.