Metalorganic vapor phase epitaxy and characterization of Zn1−xFexSe films

Abstract

The epitaxial growth of the diluted magnetic semiconductor (DMS) Zn1−xFexSe (0<x≤0.22) by metalorganic vapor phase epitaxy (MOVPE) is reported. The films were grown on (100) GaAs substrates in a vertical stagnation flow reactor with a specially designed inlet to minimize prereactions between the groups II and VI precursors. The precursors used in this study were (CH3)2Zn:N(CH2H5)3, Fe(CO)5, and H2Se diluted in H2 carrier gas. The epilayers were characterized by x-ray diffraction (XRD), Raman, absorption, and x-ray photoelectron spectroscopies (XPS). Typical growth rates were from 3–4 μm/h, which are significantly higher than those obtained by molecular beam epitaxy. Thus, in addition to the growth of DMS multilayer structures, MOVPE appears to be very promising for efficient growth of thick DMS films for Faraday magneto-optical applications.

Synthesis and vibrating properties ZnSe/Ge bi-axial heterostructural nanowires

“…There are three peaks at 206, 238 and 251 cm À1 in the Raman spectrum of ZnSe nanowire (Figure 4b). The Raman peaks at 206 and 251 cm À1 are attributed to the scatterings of the transverse optic (TO) and longitudinal optic (LO) phonon modes of ZnSe, respectively [20,21]. A strong peak at 238 cm À1 , between the TO and LO phonons, is thought to be surface mode, for its position is very close to the reported value in previous literature (237 cm À1 ) [22].…”

Solution‐Phase Synthesis and High Photocatalytic Activity of Wurtzite ZnSe Ultrathin Nanobelts: A General Route to 1D Semiconductor Nanostructured Materials

“…No vibration modes owing to impurities are observed. According to previous results,8–11 the LO phonon frequency of a single‐crystalline ZnSe film is 254 cm −1 and that of a single‐crystal of ZnSe is 255 cm −1 at room temperature. Both indicate a broad Raman peak, owing to the high surface‐to‐volume ratio of small particles.…”

Low temperature synthesis of ZnSe nanowires by self-catalytic liquid-solid growth

“…No vibration modes due to impurities are observed. From previous reports [15][16][17], the LO phonon frequency of single-crystalline ZnSe is 255 cm −1 at room temperature. For ZnSe polycrystalline nanoparticles, the TO and LO phonon frequencies are 210 and 255 cm −1 , respectively, and the broad Raman peaks may be attributed to the high surface-tovolume ratio of small particles.…”