Doping effect on optical recording film with Ge2Sb2Te5 composition

Tatsuhiko Matsushita; Akio Suzuki; Takayuki Kamitani; Masahiro Okuda

doi:10.1117/12.150646

13 August 1993 Doping effect on optical recording film with Ge₂Sb₂Te₅ composition

Tatsuhiko Matsushita, Akio Suzuki, Takayuki Kamitani, Masahiro Okuda

Proceedings Volume 2053, Optical Storage (ISOS '92); (1993) https://doi.org/10.1117/12.150646
Event: Optical Storage: Third International Symposium, 1992, Kunming, Yunnan Province, China

Abstract

In stoichiometric GeTe-Sb₂Te₃ films, reversible phase change optical recording materials, Sb addition is used widely to improve the data retention time and the repetition cycles, but its mechanism is not clear. To clarify the effect of excess Sb, the effects of Te and Ge addition were also investigated in the compositions from the stoichiometry Ge₂Sb₂Te₅ toward the vertices in the Ge-Te-Sb triangle. By DSC measurements, it was found that a retention ability for amorphous (`write') states related to the increase of repetition cycles is larger in the Sb addition than in the Te and Ge addition. By XRD measurements, it was understood that an optimum ratio of (Sb,Te)(beta) /GeTe(111), about 0.5 was necessary to static repetition cycles approximately 10⁶ in the laser annealed film of 1000 angstroms thick.

Citation Download Citation

Tatsuhiko Matsushita, Akio Suzuki, Takayuki Kamitani, and Masahiro Okuda "Doping effect on optical recording film with Ge₂Sb₂Te₅ composition", Proc. SPIE 2053, Optical Storage (ISOS '92), (13 August 1993); https://doi.org/10.1117/12.150646

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