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Durability of rewritable phase-change Ge X Sb Y Te1 − X − Y memory devices

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Abstract

The bond constraint theory (BCT) dealing with the rigidity caused by bond constraints and the long-range potential fluctuations (LRPF) arising from the defects and heterogeneities in the disordered semiconductors are important for understanding the atomic and electronic properties of amorphous semiconductors. Here, they are applied to the already commercialized Ge X Sb Y Te1 − X − Y (GST) chalcogenide glasses used in the rewritable phase change memory (PCM) devices. The main concern at present is to improve their ability to withstand a large number of phase change cycles, by choosing the right composition. The two considerations (BCT and LRPF) are briefly described and tested on the most commonly used Ge2Sb2Te5 and the nearby compositions. While these considerations provide significant insight into their atomic and electronic structures, the ansatz linking them with the durability of the PCM devices need to be justified by more work.

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Acknowledgements

The authors are grateful to H Fritzsche, M A Paesler, K L Chopra and P Boolchand for useful comments. The authors also thank R C Budhani for the Excimer laser, and Ram Bilas and the M.Sc. students (M Hemanadhan, Ayoti Patra, Ankit Goel, Ashish Shukla) for help in the experimental work. The financial support by CSIR, New Delhi is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur, 208 016, India

    N PARVATHALA REDDY, RAJEEV GUPTA & S C AGARWAL

  2. Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur, 208 016, India

    Ch BAPANAYYA & RAJEEV GUPTA

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  1. N PARVATHALA REDDY
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  2. Ch BAPANAYYA
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  4. S C AGARWAL
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Correspondence to S C AGARWAL.

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REDDY, N.P., BAPANAYYA, C., GUPTA, R. et al. Durability of rewritable phase-change Ge X Sb Y Te1 − X − Y memory devices. Pramana - J Phys 80, 1065–1081 (2013). https://doi.org/10.1007/s12043-013-0532-5

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  • DOI: https://doi.org/10.1007/s12043-013-0532-5

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