Influence of structural properties and of growth conditions on exciton properties in ZnCdSe/ZnSe quantum well structures

• Structural and optical properties of relaxed and pseudomorphic ZnCdSe/ZnSe quantum well heterostructures are described. Structural quality and strain conditions of the films are linked with their light emission properties. From the temperature dependence of photoluminescence (PL) spectra we estimate exciton coupling constants to acoustic phonons in pseudomorphic and relaxed structures. The coupling is noticeably weaker in strain-relaxed structures with strong localization effects. PL kinetic studies confirm strong localization of excitons in strain-relaxed structures.

Nyckelord

ZnCdSe/ZnSe

quantum well structures

excitons

localization

photoluminescence

TECHNOLOGY

TEKNIKVETENSKAP

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