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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.


XRD pattern of the PbSe-ZnSe composite thin films. Dots indicate PbSe and circles indicate ZnSe.
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Figure 3: XRD pattern of the PbSe-ZnSe composite thin films. Dots indicate PbSe and circles indicate ZnSe.

Mentions: Figure 3 depicts the XRD pattern for the PbSe-ZnSe composite thin films. The weak XRD peak of PbSe at 1 mol% is enlarged in the inset for easier viewing. At a PbSe concentration of 0 mol% (i.e., pure ZnSe), polycrystalline ZnSe with a zinc-blend structure is observed, with PbSe phase appearing at concentrations exceeding 1 mol%. The solubility range of Pb in ZnSe is therefore found to be quite narrow, less than 1 mol%, corresponding well to the bulk result (Figure 2). The composite films thus deposited on a glass substrate exhibit a reasonably polycrystalline structure, but dominant (111) growth is seen in the ZnSe phase irrespective of x. At 1 mol%, the lattice constant at the PbSe (220) peak is estimated to be 0.6118 nm, close to that of the bulk result (Figure 2). This result suggests that there is also a narrow solubility range on the Pb-rich side. The phase-separating PbSe-ZnSe system is therefore maintained not only in the bulk product, but also in the film thus obtained, despite the simultaneous evaporation from multiple sources. This result demonstrates that an atmosphere near thermal equilibrium was achieved in the HWD apparatus used.


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

Abe S - Nanoscale Res Lett (2011)

XRD pattern of the PbSe-ZnSe composite thin films. Dots indicate PbSe and circles indicate ZnSe.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: XRD pattern of the PbSe-ZnSe composite thin films. Dots indicate PbSe and circles indicate ZnSe.
Mentions: Figure 3 depicts the XRD pattern for the PbSe-ZnSe composite thin films. The weak XRD peak of PbSe at 1 mol% is enlarged in the inset for easier viewing. At a PbSe concentration of 0 mol% (i.e., pure ZnSe), polycrystalline ZnSe with a zinc-blend structure is observed, with PbSe phase appearing at concentrations exceeding 1 mol%. The solubility range of Pb in ZnSe is therefore found to be quite narrow, less than 1 mol%, corresponding well to the bulk result (Figure 2). The composite films thus deposited on a glass substrate exhibit a reasonably polycrystalline structure, but dominant (111) growth is seen in the ZnSe phase irrespective of x. At 1 mol%, the lattice constant at the PbSe (220) peak is estimated to be 0.6118 nm, close to that of the bulk result (Figure 2). This result suggests that there is also a narrow solubility range on the Pb-rich side. The phase-separating PbSe-ZnSe system is therefore maintained not only in the bulk product, but also in the film thus obtained, despite the simultaneous evaporation from multiple sources. This result demonstrates that an atmosphere near thermal equilibrium was achieved in the HWD apparatus used.

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.