2002
DOI: 10.1063/1.1450252
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ZnRh 2 O 4 : A p-type semiconducting oxide with a valence band composed of a low spin state of Rh3+ in a 4d6 configuration

Abstract: It is demonstrated that a ZnRh2O4 normal spinel with a band gap of ∼2.1 eV is a unique material as a p type wide-gap semiconductor. The electrical conductivity of the sputtered film was 0.7 S cm−1 at 300 K with no intentional doping. The electronic structure was investigated by photoemission and inverse photoemission measurements and indicated that the band gap is composed mainly of ligand field splitting of an octahedrally coordinated Rh3+ octahedron between fully occupied t2g6 and empty eg0 sets.

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Cited by 106 publications
(80 citation statements)
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“…A typical example is ZnRh 2 O 4 , which has a normal spinel structure. 46) Similar to the case of ZnO, the Zn 2þ ions in this material are coordinated in tetrahedra, but they are not continuously connected, and thus do not exhibit n-type conductivity. ZnRh 2 O 4 is the only oxide that is known to exhibit p-type conductivity even in the amorphous state, and has been reported to form pn diodes on plastic substrates when combined with TAOSs.…”
Section: Design Of P-type Transparent Oxidementioning
confidence: 98%
“…A typical example is ZnRh 2 O 4 , which has a normal spinel structure. 46) Similar to the case of ZnO, the Zn 2þ ions in this material are coordinated in tetrahedra, but they are not continuously connected, and thus do not exhibit n-type conductivity. ZnRh 2 O 4 is the only oxide that is known to exhibit p-type conductivity even in the amorphous state, and has been reported to form pn diodes on plastic substrates when combined with TAOSs.…”
Section: Design Of P-type Transparent Oxidementioning
confidence: 98%
“…And lastly, within the class of transparent spinel oxides, p-type semiconducting, wide bandgap, and transparent spinel oxides (e.g., NiCo 2 O 4 , ZnIr 2 O 4 , ZnRh 2 O 4 , etc. [52][53][54][55]) have recently generated great interest in the field of optoelectronic device technology for the possible applications in "Transparent Electronics" [56]. Therefore, these reports have rekindled the interest to study the fundamental physics in spinel oxide systems.…”
Section: Spinel Materialsmentioning
confidence: 99%
“…Furthermore [24,25] is a crystal with a normal spinel structure and an optical bandgap of 2.1 eV. [26] Rh 3+ ions occupy octahedral sites, and the neighboring octahedra share their edges with each other to form the three-dimensional (3D) lattice. It exhibits p-type electrical conduction with conductivity as large as 1 S cm ±1 .…”
mentioning
confidence: 99%