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Effects of Oxygen on the Microstructures, Crystallization, Thermal and Electrical Properties of Tellurium Doped GeSb9 Films

Published online by Cambridge University Press:  01 February 2011

Hsiang-Wen Shih ,
Yu-Hsung Perng  and
Lih-Hsin Chou
Hsiang-Wen Shih
Affiliation:
[email protected], National Tsing Hua University, Materials Sciecnce & Engineering, 101, Sec. 2, Kuang Fu Road, Hsinchu, 30013, Taiwan
Yu-Hsung Perng
Affiliation:
[email protected], National Tsing Hua University, Materials Sciecnce & Engineering, 101, Sec. 2, Kuang Fu Road, Hsinchu, 30013, Taiwan
Lih-Hsin Chou
Affiliation:
[email protected], National Tsing Hua University, Materials Sciecnce & Engineering, 101, Sec. 2, Kuang Fu Road, Hsinchu, 30013, Taiwan
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Abstract

Tellurium and oxygen co-doped GeSb9 films (denoted as GeSb9-Te/O) with fixed Te concentration for phase change random access memory (PRAM) are investigated. The crystallization temperatures increased from 169°C to 201°C and the crystallization activation energy decreased from 5.53 eV to 2.89 eV as the oxygen concentration increased from 0 at.% to 17.3 at.%. The structures of crystalline GeSb9-Te/O films annealed at 250°C are identified as Sb rhombohedral structure with oxygen concentration less than 18 at.%, and the lattice parameter increased from 4.48 Å to 4.52 Å as the oxygen concentration increased from 0 at.% to 17.3 at.%. The grain size became smaller after oxygen doping. For films with oxygen concentration below 6 at.% and annealed at 250°C, only some of Ge form germanium suboxide GeOx, others remain metallic state. In films with oxygen concentration 28.1 at.% and annealed at 250°C, the GeO2 bond and Sb2O3 bond co-existed. The resistivity of amorphous phase (or crystalline phase) increases from 5.17 Ω-cm to 24.81 Ω-cm (or 1.12×10−4 Ω-cm to 1.05×10−3 Ω-cm), about 4.8 times (or about 9.4 times) as oxygen concentration increases from 0 at.% to 17.3 at.%. The film properties show beneficial in PRAM application.

Keywords

memorydopantmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1072: Symposium G – Phase-Change Materials for Reconfigurable Electronics and Memory Applications , 2008 , 1072-G03-07
Copyright
Copyright © Materials Research Society 2008

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