Ferromagnetic Cu doped ZnO as an electron injector in heterojunction light emitting diodes

T. S. Herng, Shu Ping Lau, Siu Fung Yu, S. H. Tsang, K. S. Teng, J. S. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

Abstract

Ferromagnetic and highly conductive copper doped ZnO (ZnO:Cu) films were prepared by filtered cathodic vacuum arc technique. By employing a biasing technique during growth, the electron concentration and resistivity of the ZnO:Cu films can be as high as 1020 cm-3 and 5.2× 10-3 cm, respectively. The ferromagnetic behavior is observed in all the conductive films, but its magnetization is quenched with an increment in carrier concentration, suggesting that carrier induced exchange is not directly responsible for the ferromagnetism. Heterojunction light emitting diodes have been fabricated using the conductive ZnO:Cu layer as an electron injector and a p -type GaN as hole injector. Electroluminescence can be detected from the devices.
Original languageEnglish
Article number103104
JournalJournal of Applied Physics
Volume104
Issue number10
DOIs
Publication statusPublished - 9 Dec 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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