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Temperature dependence of the direct bandgap and transport properties of CdO
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10.1063/1.4775691
/content/aip/journal/apl/102/2/10.1063/1.4775691
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4775691
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Absorption spectra as a function of temperature for sample B, a CdO film with . Inset: absorption spectra for samples A, B, and C at 100 K.

Image of FIG. 2.
FIG. 2.

Absorption edge energy or “optical gap” as a function of temperature for the three CdO films with different carrier concentrations. The points are the experimental data and the lines are model calculations. The optical gap decreases with temperature with Varshni parameters, and . The zero-temperature fundamental bandgap and band edge effective mass used in the model in the limit of zero carrier density are 2.31 eV and , respectively.

Image of FIG. 3.
FIG. 3.

Schematic representation of the band structure close to the -point in CdO, illustrating the phenomena that influence the bandgap and band edge effective mass: (a) an empty conduction band at 0 K; (b) an empty conduction band undergoing a bandgap reduction due to temperature effects; and (c) the effects of conduction band filling ( ) and bandgap renormalization ( ). The former directly influences the latter with the high free electron densities leading to increased B-M shift of the band edge and larger reduction of the bandgap due to many body interactions. The resulting gap for allowed interband transitions defines the temperature-dependent optical edge, , at non-zero wavevectors.

Image of FIG. 4.
FIG. 4.

Carrier concentration (a) and mobility (b) as a function of temperature for three CdO samples.

Image of FIG. 5.
FIG. 5.

The fundamental direct -point bandgap variations with respect to temperature in CdO.

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/content/aip/journal/apl/102/2/10.1063/1.4775691
2013-01-15
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temperature dependence of the direct bandgap and transport properties of CdO
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4775691
10.1063/1.4775691
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