Cathodoluminescence in doped CdP2 and CdSiP2 crystals

Abstract

Some general features of the behaviour of Cu, Zn, Bi, and Mn impurities in CdSiP2 and CdP2 crystals are studied by analyzing electron beam‐excited luminescence spectra measured in a temperature range of 6 to 300 K, as well as by determining their electrical parameters. The impurities are established to substitute mainly the cadmium in the crystalline lattice and to promote the formation of complexes of defects, which are radiative recombination centers. Cadmium vacancies as well participate in the defect complex formation processes. A radiation ascribed to interstitial cadmium‐type defects, is discovered in CdSiP2 crystals.

Growth and characterization of large CdSiP2 single crystals

“…The birefringence of tiny 2 Â 2 Â 0.2 mm 3 CdSiP 2 crystals grown from a molten tin flux was measured by Itoh et al [2] and found to be À 0.045 at 840 nm. More recent studies examined the cathodoluminescence [11] and nuclear magnetic resonance (NMR) spectra [12] of small CdSiP 2 crystalline samples, and recent theoretical studies examined the calculated electronic band structure [13][14][15][16]. Crystals grown through either solution or halogen-assisted vapor transport were never of sufficient size or quality to create non-linear optical devices or to measure the ordinary and extraordinary refractive index of CdSiP 2 as a function of wavelength throughout its transparency range to determine if it could be phase matched.…”

“…They can, however, be plagued by defect related absorption losses near the band edge when grown from the melt, but these can often be eliminated by post-growth processing. CdSiP 2 is a II-IV-V 2 compound that has been examined by several authors starting in the late 1960s [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Borshchevskii et al [5] reported halogen assisted vapor transport growth of the compound as early as 1967, and Spring-Thorpe and Pamplin [4] reported growth from molten tin solution in 1968.…”

Fabrication, study of optical properties and structure of most stable (CdP2)n nanoclusters

“…The symmetry of its lattice is characterised by the space symmetry group 4 4 D for right-rotating and 8 4 D for left-rotating modification (tetragonal syngony). The CdP 2 energy gap is 2.155 eV [19]. Since the bulk crystal is red at the temperature of 77 K, the blue shifted exciton lines of CdP 2 nanoclusters are expected to be in visible or near UV spectral region.…”