Dopant Ion Size and Electronic Structure Effects on Transparent Conducting Oxides. Sc-Doped CdO Thin Films Grown by MOCVD
Citations Over TimeTop 18% of 2004 papers
Abstract
A series of Sc-doped CdO (CSO) thin films have been grown on both amorphous glass and single-crystal MgO(100) substrates at 400 degrees C by MOCVD. Both the experimental data and theoretical calculations indicate that Sc3+ doping shrinks the CdO lattice parameters due to its relatively small six-coordinate ionic radius, 0.89 angstroms, vs 1.09 angstroms for Cd2+. Conductivities as high as 18100 S/cm are achieved for CSO films grown on MgO(100) at a Sc doping level of 1.8 atom %. The CSO thin films exhibit an average transmittance >80% in the visible range. Sc3+ doping widens the optical band gap from 2.7 to 3.4 eV via a Burstein-Moss energy level shift, in agreement with the results of band structure calculations within the sX-LDA (screened-exchange local density approximation) formalism. Epitaxial CSO films on single-crystal MgO(100) exhibit significantly higher mobilities (up to 217 cm2/(V x s)) and carrier concentrations than films on glass, arguing that the epitaxial CSO films possess fewer scattering centers and higher doping efficiencies due to the highly textured microstructure. Finally, the band structure calculations provide a microscopic explanation for the observed dopant size effects on the structural, electronic, and optical properties of CSO.
Related Papers
- → Absolute surface energies of semipolar planes of AlN during metalorganic vapor phase epitaxy growth(2018)12 cited
- → How dopant size influences the protonic energy landscape in BaSn1−xMxO3−x/2(M = Ga, Sc, In, Y, Gd, La)(2013)33 cited
- → Effect of Dopants on Microwave Dielectric Properties of Ba(Zn1/3Ta2/3)O3 Ceramics(2005)32 cited
- → Growth of GaAs epitaxial layers prepared in the laboratory with an integrated safety MOCVD system(1988)5 cited
- Epitaxial growth of GaN on sapphire substrate by LP-MOVPE(1996)