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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 9, Iss. 9 — Sep. 1, 2013
  • pp: 764–769

Analysis of Kink Effect and Short Channel Effects in Fully Self-Aligned Gate Overlapped Lightly Doped Drain Polysilicon TFTs

A. Valletta, L. Mariucci, A. Pecora, L. Maiolo, S. D. Brotherton, and G. Fortunato

Journal of Display Technology, Vol. 9, Issue 9, pp. 764-769 (2013)


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Abstract

Electrical characteristics of fully self-aligned gate overlapped lightly doped drain (FSA-GOLDD) polysilicon TFTs, fabricated with a spacer technology providing submicron (0.35 $\mu$ m) LDD regions, have been analyzed by using two-dimensional numerical simulations. The numerical analysis was used to explain the observed reduced kink effect and short channel effects presented by FSA GOLDD devices, compared to SA devices. The reduction of the kink effect has been attributed to the reduced impact ionization rate, and related to reduced electric fields at the channel/LDD junction. In addition, the role of the LDD dose on the kink effect has been also investigated, clarifying the observed current inflection occurring in the kink effect regime and the LDD dose dependence of the breakdown. Reduced short channel effects were attributed to reduced floating body effects, since drain induced barrier lowering was apparently not affected by the SA GOLDD structure, when compared to SA devices.

© 2013 IEEE

Citation
A. Valletta, L. Mariucci, A. Pecora, L. Maiolo, S. D. Brotherton, and G. Fortunato, "Analysis of Kink Effect and Short Channel Effects in Fully Self-Aligned Gate Overlapped Lightly Doped Drain Polysilicon TFTs," J. Display Technol. 9, 764-769 (2013)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-9-9-764

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