6533b7dafe1ef96bd126eaf9
RESEARCH PRODUCT
Pressure and temperature dependence of the band-gap in CdTe
V. MuñozS. GillilandI. MoraAlfredo SeguraJ. GonzálezJ. GonzálezH. S. GüderH. S. Güdersubject
Phase transitionAbsorption spectroscopybusiness.industryBand gapChemistryAnalytical chemistryCondensed Matter PhysicsIsothermal processElectronic Optical and Magnetic MaterialsBlueshiftOpticsAbsorption edgeIsobaric processMetalorganic vapour phase epitaxybusinessdescription
In this paper we report on isothermal compression measurements (up to 5 GPa and 500 K) of the optical absorption edge of 1 μm epitaxial layers of CdTe growth by metalorganic chemical vapor deposition (MOCVD) on GaS substrates. The isothermal blue shift under pressure of the direct energy gap (Γ v 15 → Γ c 1 ) in the zinc-blende phase is about 7.1 × 10 -2 eV GPa -1 and is found to be independent of temperature within the experimental errors. The isobaric red shift in the stability range of the zinc-blende phase is about -3.76 × 10 -4 eV K -1 . Regarding the phase transitions, no discontinuity in the energy gap has been found in the narrow pressure range where the cinnabar phase can be present. The transition pressure to the NaCl-type structure in CdTe is found to decrease with increasing temperature (294-500 K) following the law P t = 4.1 GPa - 6.6 x 10 -3 (T- 273) (K).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-02-01 | physica status solidi (b) |