Growth and properties of transparent conducting CuAlO2 single crystals by a flux self-removal method

Yoon, Joonseok; Nam, Yoon Sung; Baek, Kyung Seon; Park, C.W.; Chang, Soon-Bok

doi:10.1016/j.jcrysgro.2012.12.134

Cited by 10 publications

(12 citation statements)

References 10 publications

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“…In the ternary delafossite oxide structure of CuAlO 2 {O-Cu-O} dumbbell layers are stacked with AlO 6 octahedra and hexagonal Cu layers perpendicular to the c axis [8]. CuAlO 2 delafossite has trigonal symmetry (space group R3m), with a = b = 2.857Å, c = 16.939Å, an indirect bandgap of 2.22 eV and a direct gap of 3.4 eV [9].…”

Section: Introductionmentioning

confidence: 99%

“…So far, CuAlO 2 has mainly been grown as polycrystalline thin layers or on a ceramic route [4,10,11]. Only scarce reports on the growth of small single crystal can be found in the literature [8,9,12,13] and all of them rely on crystallization from melt solutions based on excess copper oxides (Cu 2 O, CuO) and Al 2 O 3 . This results in millimeter-sized (0001) platelets with several 100 µm thickness.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic investigations on the growth of CuAlO2 delafossite crystals

Wolff

Klimm

Siche

2018

Journal of Solid State Chemistry

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Simultaneous differential thermal analysis (DTA) and thermogravimetric (TG) measurements with copper oxide/aluminum oxide mixtures were performed in atmospheres with varying oxygen partial pressures and with crucibles made of different materials. Only sapphire and platinum crucibles proved to be stable under conditions that are useful for the growth of CuAlO 2 delafossite single crystals. Then the ternary phase diagram Al 2 O 3 -CuO-Cu and its isopleth section Cu 2 O-Al 2 O 3 were redetermined. Millimeter sized crystals could be obtained from copper oxide melts with 1-2 mol-% addition of aluminum oxide that are stable in platinum crucibles held in oxidizing atmosphere containing 15-21% oxygen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigations on the growth of CuAlO2 delafossite crystals

Wolff

Klimm

Siche

2018

Journal of Solid State Chemistry

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“…It is certainly possible to obtain small quantities of such lowvalency oxides, either as epitaxial layers or in the bulk, just by crystallizing them together in an oxygen-poor atmosphere. This was demonstrated by Yoon et al (2013) with millimetresized CuAlO 2 crystals that could be grown from a Cu 2 O melt flux. Some time ago, Gadalla & White (1964) showed that, in air, CuAlO 2 becomes unstable below 1030 C, undergoing partial oxidation to CuO.…”

Section: Figurementioning

confidence: 97%

Electronic materials with a wide band gap: recent developments

Klimm¹

2014

IUCrJ

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The development of semiconductor electronics is reviewed briefly, beginning with the development of germanium devices (band gap E g = 0.66 eV) after World War II. A tendency towards alternative materials with wider band gaps quickly became apparent, starting with silicon (E g = 1.12 eV). This improved the signal-to-noise ratio for classical electronic applications. Both semiconductors have a tetrahedral coordination, and by isoelectronic alternative replacement of Ge or Si with carbon or various anions and cations, other semiconductors with wider E g were obtained. These are transparent to visible light and belong to the group of wide band gap semiconductors. Nowadays, some nitrides, especially GaN and AlN, are the most important materials for optical emission in the ultraviolet and blue regions. Oxide crystals, such as ZnO and -Ga 2 O 3 , offer similarly good electronic properties but still suffer from significant difficulties in obtaining stable and technologically adequate p-type conductivity.

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“…Therefore, the crystals were leached in 1 n HNO 3 for 3 days. Yoon et al . reported that CuAlO 2 crystals precipitate from the supersaturated molten solution on the bottom of an alumina crucible while Cu 2 O flux is simultaneously self‐removed as the flux creeps up the walls of the crucible.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Investigation of Ternary Delafossite Crystals

Wolff

Klimm

Ganschow

et al. 2019

Crystal Research and Technology

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The ternary phase diagram of copper-iron-aluminium delafossite is established with FactSage calculations to improve the conditions for solution growth and the electrical conductivity of the transparent p-type semiconductor copper-aluminium delafossite by addition of iron oxide. Initial growth experiments with the optical float zone method show that the growth of single crystals with commercially relevant dimensions is not expected in the near future.

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Growth and properties of transparent conducting CuAlO2 single crystals by a flux self-removal method

Cited by 10 publications

References 10 publications

Thermodynamic investigations on the growth of CuAlO2 delafossite crystals

Thermodynamic investigations on the growth of CuAlO2 delafossite crystals

Electronic materials with a wide band gap: recent developments

Thermodynamic Investigation of Ternary Delafossite Crystals

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