Growth of delafossite CuAlO2single crystals in a reactive crucible

Du Hyung Kim; Minsik Kong; Myeongjun Kang; Minjae Kim; Seohee Kim; Youngwook Kim; Sangmoon Yoon; Jong Mok Ok

doi:10.1088/1361-648X/ac98e9

Growth of delafossite CuAlO₂single crystals in a reactive crucible

J Phys Condens Matter. 2022 Nov 10;51(2). doi: 10.1088/1361-648X/ac98e9.

Authors

Du Hyung Kim¹, Minsik Kong¹, Myeongjun Kang¹, Minjae Kim¹, Seohee Kim¹, Youngwook Kim², Sangmoon Yoon³, Jong Mok Ok¹

Affiliations

¹ Department of Physics, Pusan National University, 46241 Busan, Republic of Korea.
² Department of Physics and Chemistry, DGIST, 42988 Daegu, Republic of Korea.
³ Department of Physics, Gachon Universtiy, 13120 Seongnam, Republic of Korea.

PMID: 36215967
DOI: 10.1088/1361-648X/ac98e9

Abstract

Delafossite oxide CuAlO₂has received great attention as a promising p-type conducting oxide. In this work, high-quality CuAlO₂single crystals with a size of several millimeters (mm) are successfully synthesized with areactivecrucible melting method. The crystals are characterized by x-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy, transport measurement, and magnetic susceptibility measurement. The CuAlO₂single crystals show semiconducting behavior with hole carriers, which is consistent with other crystals grown by the conventional slow-cooling method. This growth method we reported here eliminates the process of removing the remaining flux, allowing easy access to the high-quality single crystals. This new approach to growing high-quality delafossite oxide CuAlO₂with a few mm size is important for new technologies that demand p-type semiconductor-based device fabrication.

Keywords: CuAlO2; delafossite; growth mechanism.