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One-step synthesis of PbSe-ZnSe composite thin film.

Abe S - Nanoscale Res Lett (2011)

Bottom Line: The XRD result reveals that the solubility limit of Pb in ZnSe is quite narrow, less than 1 mol%, with obvious phase-separation in the composite thin films.A nanoscale elemental mapping of the film containing 5 mol% PbSe indicates that isolated PbSe nanocrystals are dispersed in the ZnSe matrix.The use of a phase-separating PbSe-ZnSe system and HWD techniques enables simple production of the composite package.

View Article: PubMed Central - HTML - PubMed

Affiliation: Research Institute for Electric and Magnetic Materials, Sendai 982-0807, Japan. abe@denjiken.ne.jp.

ABSTRACT
This study investigates the preparation of PbSe-ZnSe composite thin films by simultaneous hot-wall deposition (HWD) from multiple resources. The XRD result reveals that the solubility limit of Pb in ZnSe is quite narrow, less than 1 mol%, with obvious phase-separation in the composite thin films. A nanoscale elemental mapping of the film containing 5 mol% PbSe indicates that isolated PbSe nanocrystals are dispersed in the ZnSe matrix. The optical absorption edge of the composite thin films shifts toward the low-photon-energy region as the PbSe content increases. The use of a phase-separating PbSe-ZnSe system and HWD techniques enables simple production of the composite package.

No MeSH data available.


HWD apparatus used in the study. It consists of four electric furnaces for substrate, wall, source-1, and source-2.
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Figure 1: HWD apparatus used in the study. It consists of four electric furnaces for substrate, wall, source-1, and source-2.

Mentions: A PbSe-ZnSe composite thin film was prepared by the HWD method. Figure 1 is a schematic diagram of the HWD apparatus used. There were four electric furnaces in the apparatus, designated as substrate, wall, source-1, and source-2. Each temperature could be controlled independently. In the HWD method, deposition and re-evaporation are continuously repeated upon a film surface, resulting in achieving a state near thermal equilibrium [18]. PbSe and ZnSe were used as evaporation sources and were synthesized from elements of Pb, Zn, and Se with 6 N purity. The PbSe and ZnSe sources were located at furnaces of source-2 and source-1 for simultaneous evaporation to a glass substrate (Corning #7059). Here, the temperatures were kept constant at 573 K for the substrate, 773 K for the wall, and 973 K for source-1 (ZnSe). The source-2 (PbSe) temperature was varied from 763 to 833 K to provide different PbSe concentrations. The PbSe-ZnSe composite thin film was structurally characterized using X-ray diffraction (XRD) with Cu Kα radiation (Rigaku RAD-X). A symmetric θ-2θ configuration was used. The optical absorption spectrum of the film was observed using a UV-vis-IR spectrometer (Shimadzu UV5300). The composition of the film was analyzed using energy dispersive spectroscopy (EDX model: Phoenix). The film was directly observed by transmission electron microscopy (TEM) operating at 300 kV (Hitachi H-9000NAR). In the sample preparation, mechanical polishing, dimpling, and ion milling were performed. Nanoscale elemental mapping was performed using scanning transmission electron microscopy (STEM, Hitachi HD-2700) in EDX mode (EDAX model: Genesis) operating at 200 kV with an energy resolution of approximately 145 eV.


One-step synthesis of PbSe-ZnSe composite thin film.

Abe S - Nanoscale Res Lett (2011)

HWD apparatus used in the study. It consists of four electric furnaces for substrate, wall, source-1, and source-2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211412&req=5

Figure 1: HWD apparatus used in the study. It consists of four electric furnaces for substrate, wall, source-1, and source-2.
Mentions: A PbSe-ZnSe composite thin film was prepared by the HWD method. Figure 1 is a schematic diagram of the HWD apparatus used. There were four electric furnaces in the apparatus, designated as substrate, wall, source-1, and source-2. Each temperature could be controlled independently. In the HWD method, deposition and re-evaporation are continuously repeated upon a film surface, resulting in achieving a state near thermal equilibrium [18]. PbSe and ZnSe were used as evaporation sources and were synthesized from elements of Pb, Zn, and Se with 6 N purity. The PbSe and ZnSe sources were located at furnaces of source-2 and source-1 for simultaneous evaporation to a glass substrate (Corning #7059). Here, the temperatures were kept constant at 573 K for the substrate, 773 K for the wall, and 973 K for source-1 (ZnSe). The source-2 (PbSe) temperature was varied from 763 to 833 K to provide different PbSe concentrations. The PbSe-ZnSe composite thin film was structurally characterized using X-ray diffraction (XRD) with Cu Kα radiation (Rigaku RAD-X). A symmetric θ-2θ configuration was used. The optical absorption spectrum of the film was observed using a UV-vis-IR spectrometer (Shimadzu UV5300). The composition of the film was analyzed using energy dispersive spectroscopy (EDX model: Phoenix). The film was directly observed by transmission electron microscopy (TEM) operating at 300 kV (Hitachi H-9000NAR). In the sample preparation, mechanical polishing, dimpling, and ion milling were performed. Nanoscale elemental mapping was performed using scanning transmission electron microscopy (STEM, Hitachi HD-2700) in EDX mode (EDAX model: Genesis) operating at 200 kV with an energy resolution of approximately 145 eV.

Bottom Line: The XRD result reveals that the solubility limit of Pb in ZnSe is quite narrow, less than 1 mol%, with obvious phase-separation in the composite thin films.A nanoscale elemental mapping of the film containing 5 mol% PbSe indicates that isolated PbSe nanocrystals are dispersed in the ZnSe matrix.The use of a phase-separating PbSe-ZnSe system and HWD techniques enables simple production of the composite package.

View Article: PubMed Central - HTML - PubMed

Affiliation: Research Institute for Electric and Magnetic Materials, Sendai 982-0807, Japan. abe@denjiken.ne.jp.

ABSTRACT
This study investigates the preparation of PbSe-ZnSe composite thin films by simultaneous hot-wall deposition (HWD) from multiple resources. The XRD result reveals that the solubility limit of Pb in ZnSe is quite narrow, less than 1 mol%, with obvious phase-separation in the composite thin films. A nanoscale elemental mapping of the film containing 5 mol% PbSe indicates that isolated PbSe nanocrystals are dispersed in the ZnSe matrix. The optical absorption edge of the composite thin films shifts toward the low-photon-energy region as the PbSe content increases. The use of a phase-separating PbSe-ZnSe system and HWD techniques enables simple production of the composite package.

No MeSH data available.