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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 11,
  • Issue 2,
  • pp. 152-156
  • (2015)

Block-Oxide Structure in Polycrystalline Silicon Thin-Film Transistor With Source/Drain Tie and Additional Polycrystalline Silicon Body for Analog Applications

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Abstract

In this paper, we for the first time demonstrate the analog performance of a block-oxide structure in polycrystalline silicon thin-film transistor with source/drain-tie and additional poly-Si body (BO-SDT-APSB TFT) experimentally and compared with the similar device with zero block-oxide structure (SDT-APSB TFT). The block-oxide in BOSDT-SDT-APSB TFT is fabricated to reduce the drain-induced barrier lowering and channel-length modulation. The source-drain tie and additional poly-silicon body region are fabricated in both devices to improve the device performance and reduce the self-heating effect. Experimental results show that the block-oxide structure can offer enhanced gate controllability over the channel, and the transconductance ( $g _{\rm m}$ ) of the BO-SDT-APSB TFT is therefore improved. In addition, although a higher drain conductance ( $g _{\rm d}$ ), implying a lower output resistance $r _{\rm o}$ , is observed for a BO-SDT-APSB TFT, the enhanced gm still helps to achieve the desired intrinsic voltage gain ( $A _{\rm v} = g _{\rm m} / g _{\rm d}$ ) behavior.

© 2014 IEEE

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