Strain relaxation in GaNxP1-x alloy: Effect on optical properties

Buyanova, Irina A.Linköpings universitet,Funktionella elektroniska material,Tekniska högskolan (author)

Strain relaxation in GaNxP1-x alloy : Effect on optical properties

By using scanning electron microscopy and cathodoluminescence (CL), a decrease in radiative efficiency of GaNP alloy with increasing N content is seen due to the formation of structural defects. The defect formation is attributed to relaxation of tensile strain in the GaNP layer, which is lattice mismatched to GaP substrate. Several types of extended defects including dislocations, microcracks and pits are revealed in partly relaxed GaNxP1-x epilayers with x=1.9%, whereas coherently strained layers exhibit high crystalline quality for x up to 4%. According to the CL measurements, all extended defects act as competing, non-radiative channels leading to the observed strong decrease in the radiative efficiency. From CL mapping experiments, non-uniformity of strain distribution around the extended defects is partly responsible for the broadening of the photoluminescence (PL) spectra recorded in the macro-PL experiments. © 2001 Elsevier Science B.V. All rights reserved.

Chen, WeiminLinköpings universitet,Tekniska högskolan,Funktionella elektroniska material(Swepub:liu)weich55 (author)
Goldys, E.M.Division of Information and Communication Sciences, Macquarie University, Sydney, NSW, Australia (author)
Phillips, M.R.Microstructural Analysis Unit, University of Technology, Sydney, NSW, Australia (author)
Xin, H.P.Department of Electrical and Computer Engineering, University of California, San Diego, CA, United States (author)
Tu, C.W.Department of Electrical and Computer Engineering, University of California, San Diego, CA, United States (author)
Linköpings universitetFunktionella elektroniska material (creator_code:org_t)

By the author/editor: Buyanova, Irina ...; Chen, Weimin; Goldys, E.M.; Phillips, M.R.; Xin, H.P.; Tu, C.W.

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