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Copper selenide nanowires and nanocrystallites in alumina: Carrier relaxation, recombination, and trapping
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10.1063/1.2735397
/content/aip/journal/jap/101/11/10.1063/1.2735397
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/11/10.1063/1.2735397

Figures

Image of FIG. 1.
FIG. 1.

SEM: Matrix anodized in oxalic acid.

Image of FIG. 2.
FIG. 2.

TEM: 5 min (nc)—left, (nw)—center, 5 min (nw)— right.

Image of FIG. 3.
FIG. 3.

XRD: —solid line, —dashed line, Cu—dotted line. Peak widening due to nanoparticles.

Image of FIG. 4.
FIG. 4.

Direct (a) and indirect (b) band gap representation for samples: nanocrystallites: (solid line-bold), 2 min (solid line) and nanowires: 5 min (dashed line), (dotted line). Straight lines point out the band gap values. In the (a) insert straight lines—tangents indicating continuous change of the due to superposition of band gaps of different size nc.

Image of FIG. 5.
FIG. 5.

The transient grating dynamics of nc samples (a), 1/1 (b), and 2 min (c) measured at two different picosecond excitation intensities (open squares—, filled squares—). The points are experimental values of diffraction efficiency, the lines are theoretical modeling according to Eq. (3). Each filled area corresponds to a series of kinetics calculated with intermediate values of Auger recombination coefficient . For parameters see Table II.

Image of FIG. 6.
FIG. 6.

The transient grating dynamics of nw samples 5 min (a), 10 min (b), and (c) measured at two different picosecond excitation intensities (open squares—, filled squares—). The points are experimental values of diffraction efficiency, the lines are theoretical modeling according to Eq. (4). Each filled area corresponds to a series of kinetics calculated with intermediate values of Auger recombination coefficient . For parameters see Table II. Two pairs of curves (dashed and dotted lines) in (b) correspond to calculations with including additionally the change of refractive index defined by charged shallow impurities (see Discussion).

Image of FIG. 7.
FIG. 7.

The transient grating dynamics of nc (a) sample and nw (b) sample measured at femtosecond excitation intensity . The points are experimental values of diffraction efficiency, the lines are theoretical modeling according to Eq. (5), where lines 1–4 show the dynamics in time of carrier population at each level numbered; line 5—the dynamics in time of carrier population on all levels in total. The filled area corresponds to a series of kinetics calculated with intermediate values of Auger recombination coefficient and for nc and nw samples, respectively. For parameters see Tables II and III.

Image of FIG. 8.
FIG. 8.

Absorption coefficient spectral dependence of sample 5 min (nw) (dotted line). Calculated curves: 1 Lorentzian ; 2 , 3 , and superposition of curves 1 and 2 (gray line-bold). The arrow indicates the laser excitation energy.

Image of FIG. 9.
FIG. 9.

Energy diagram in space (left), and transition exchange scheme shallow centers—valence band (right). Band gap limits taken from Refs. 4, 6, and 8–10 encompass measured values.

Tables

Generic image for table
Table I.

Characterization of samples.

Generic image for table
Table II.

Parameters used for theoretical modeling of the kinetics by Eqs. (3) and (4).

Generic image for table
Table III.

Parameters used for theoretical modeling of the kinetics by Eq. (5).

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/content/aip/journal/jap/101/11/10.1063/1.2735397
2007-06-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Copper selenide nanowires and nanocrystallites in alumina: Carrier relaxation, recombination, and trapping
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/11/10.1063/1.2735397
10.1063/1.2735397
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