Journal Article

FZJ-2021-00192

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The importance of singly charged oxygen vacancies for electrical conduction in monoclinic HfO 2

Mueller, M. P. (Corresponding author) ; Gunkel, F.FZJ* ; Hoffmann-Eifert, S.FZJ* ; De Souza, R. A.

2021
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/26709  doi:10.1063/5.0036024

Abstract: The point-defect structure of monoclinic HfO2 (m-HfO2) was studied by means of equilibrium electrical conductance measurements as a function of temperature 1050≤T/K≤1200 and oxygen partial pressure −20≤log(pO2/bar)≤−2. The total conductivity σ displayed similar behavior at each temperature examined. In oxidizing conditions (pO2≥10−7bar), the total conductivity increased with increasing oxygen partial pressure and was assigned to hole conduction. Around 10−10 bar, a region of almost constant conductivity was found; this is ascribed to ionic conduction by means of doubly charged oxygen vacancies. In reducing conditions (pO2≤10−16bar), the total conductivity surprisingly decreased with decreasing oxygen partial pressure. Defect-chemical modeling indicates that this behavior is consistent with the conversion of mobile doubly charged oxygen vacancies into less mobile singly charged vacancies by electron trapping. Point-defect concentrations at the oxygen partial pressures relevant to resistive switching devices are predicted and discussed.

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Contributing Institute(s):

1. Elektronische Materialien (PGI-7)
2. JARA Institut Green IT (PGI-10)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 5233 - Memristive Materials and Devices (POF4-523) (POF4-523)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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