A germanate transparent conductive oxide.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 21915112.
- Also identified by DOI 10.1038/ncomms1484 and PMC identifier 3195232.
- Licence recorded as CC BY-NC-SA.
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Abstract
Wide bandgap conductors such as In₂O₃ and ZnO are used as transparent conducting oxides (TCOs). To date, TCOs are realized using post transition metal cations with largely spread s-orbitals such as In³⁺, Sn⁴⁺, Zn²⁺ and Cd²⁺. On the other hand, no good electronic conductor has been realized in oxides of Al, Si and Ge. Here we report the conversion of an oxide of Ge into a good electronic conductor by employing the concept of superdegeneracy. We find that cubic SrGeO₃, synthesized under high pressure, displays a direct bandgap of 3.5 eV, a carrier mobility of 12 cm²(Vs)⁻¹, and conductivities of 3 Scm⁻¹ (DC) and 400 Scm⁻¹ (optical conductivity). This is the first Ge-based electronic conductive oxide, and expands the family of TCOs from ionic oxides to covalent oxides.