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Optical absorption and photoreflectance spectroscopy of the single-crystalline chalcopyrite semiconductor AgGaSe2
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10.1063/1.4803892
/content/aip/journal/jap/113/17/10.1063/1.4803892
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803892

Figures

Image of FIG. 1.
FIG. 1.

Plots of the square of the absorption coefficient vs photon energy for AgGaSe at  = 15, 80, 200, and 300 K for (a)  ⊥  and (b)  ‖ .

Image of FIG. 2.
FIG. 2.

(a) Plots of vs for  ⊥  (solid circles) and || (open circles) determined from the optical absorption measurements. The solid line represents the fit of the experimental data to Eq. (3) . The dashed line indicates d /d data for  ⊥ . (b) Plots of Δ  =  () −  (0) vs for AgGaSe, together with those for Δ (red line) and Δ (blue line) calculated from Eqs. (4) and (6) , respectively. The open squares indicate the calculated Δ results by the first-principle band calculation.

Image of FIG. 3.
FIG. 3.

PR spectra for AgGaSe measured at  = 20–300 K for (a)  ⊥  and (b)  ‖ .

Image of FIG. 4.
FIG. 4.

PR spectra for AgGaSe measured at  = 20 K for  ⊥  (solid circles) and  ‖  (open circles). The solid lines represent the fits using Eq. (8) with  = 2 to the experimental data.

Image of FIG. 5.
FIG. 5.

Plots of (a) , (b) , and (c) vs determined from the PR measurements (solid circles). The solid lines represent the fit of the experimental data to Eq. (3) . The dashed lines indicate d /d ( = , , ) data.

Image of FIG. 6.
FIG. 6.

Valence-band splitting at the Γ point of (a) CuInSe and (b) AgGaSe. The selection rules of the optical dipole transitions are schematically shown.

Image of FIG. 7.
FIG. 7.

(a) Plots of Δ vs for AgGaSe determined from the PR measurements. The solid line represents the calculated result of Eq. (14) . (b) Plots of Δ vs for AgGaSe.

Tables

Generic image for table
Table I.

Values of and ( = 1, 2, 3) in Eq. (5) , and , Θ, and in Eq. (6) for AgGaSe.

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/content/aip/journal/jap/113/17/10.1063/1.4803892
2013-05-07
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical absorption and photoreflectance spectroscopy of the single-crystalline chalcopyrite semiconductor AgGaSe2
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803892
10.1063/1.4803892
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