Advertisement

Mechanism of Reversible Optical Storage in Evaporated Amorphous AsSe and Ge10As40Se50

  • J. P. deNeufville
  • R. Seguin
  • S. C. Moss
  • S. R. Ovshinsky
Part of the Institute for Amorphous Studies Series book series (IASS)

Abstract

The holographic response (Keneman, 1971; Ohmachi and Igo, 1972) of evaporated AS2S3 at 4880Å has been ascribed to photo-polymerization of a hard-sphere As4S6 glass (deNeufville et al., 1973). The effect of illumination is to shift the location of the optical absorption edge (ΔE=-0.06eV), and to increase the refractive index (An=0.08). A comparable increase in refractive index occurs during annealing of evaporated As2S3 at 189 C, near its glass transition temperature, accompanied by a smaller edge shift (Δn=-0.03eV). While the optical absorption edge can be reversibly cycled by exposure at 25°C and annealing at 180°C (ΔE=-0.03eV), the accompanying index changes are relatively small (ΔE=**0.01). Furthermore, the X-ray diffraction pattern is unaffected by cycling, suggesting that the optical effects arise from the creation (exposure) and elimination (annealing) of a nonequilibrium concentration of trapped charge carriers rather than from an innate structural change.

Keywords

Optical Absorption Edge Trap Charge Carrier Innate Structural Change Interband Optical Transition Optical Transition Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. S.C. Agarwal, 1973, (private communication).Google Scholar
  2. R.J. F. Dalrymple and W.E. Spear, 1972, J. Phys. Chem. Sol ids 33, 1071.ADSCrossRefGoogle Scholar
  3. J.P. deNeufville, S.C. Moss and S.R. Ovshinsky, 1973 (submitted to J. of Non-Cryst. Solids).Google Scholar
  4. R.E. Drews, R.L. Emerald, M.L. Slade and R. Zallen, 1972, Solid State Commun. 10, 293.ADSCrossRefGoogle Scholar
  5. T. Igo and Y. Toyoshima, 1973, J. Non-Cryst. Solids 11, 304.ADSCrossRefGoogle Scholar
  6. M. Kastner, Phys. Rev., 1972, Lett. 28, 355.ADSGoogle Scholar
  7. S.A. Keneman, 1971, Appl. Phys. Lett. 19, 205.ADSCrossRefGoogle Scholar
  8. Y. Ohmachi and T. Igo, 1972, App. Phys. Lett. 20, 506.ADSCrossRefGoogle Scholar
  9. S.R. Ovshinsky, 1973, presented at Topical Meeting on Optical Storage of Digital Data, Aspen, Colorado, (to be published).Google Scholar
  10. S.R. Ovshinsky, 1970, U.S. Patent 3,530.Google Scholar
  11. S.R. Ovshinsky, 1970, U.S. Patent 3,441.Google Scholar
  12. J. Stuke, 1970, J. Non-Cryst. Solids 4, 1.ADSCrossRefGoogle Scholar
  13. S.H. Wemple, 1973, Phys. Rev. B7, 3767.ADSGoogle Scholar
  14. S.H. Wemple and M. DiDomenico, 1971, Jr., Phys. Rev. B3, 1338.ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • J. P. deNeufville
    • 1
  • R. Seguin
    • 1
  • S. C. Moss
    • 1
  • S. R. Ovshinsky
    • 1
  1. 1.Energy Conversion Devices, Inc.TroyUSA

Personalised recommendations