Analysis of the transient body effect model for an LTPS TFT on a plastic substrate

Yunyeong Choi; Taekyeong Lee; Jisun Park; Hyungsoon Shin

doi:10.1016/j.sse.2020.107948

Analysis of the transient body effect model for an LTPS TFT on a plastic substrate

Yunyeong Choi, Taekyeong Lee, Jisun Park, Hyungsoon Shin

Electronic and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

This work investigates the transient current in the subthreshold region of a low-temperature polycrystalline silicon thin-film transistor (LTPS TFT) on a polyimide (PI) substrate. The measurement of this current shows an instability that is not seen in the device on a glass substrate; the instability appears as a current variation under constant voltage and overshoot or undershoot under external stress voltage transitions. To explain this effect for a TFT on a PI substrate, a transient body effect (TBE) is suggested due to a threshold voltage shift caused by the charge distribution inside the substrate. A SPICE model is proposed based on this concept, and it shows excellent agreement with device measurements. The model offers a simulation guideline for LTPS TFTs on PI substrates.

Original language	English
Article number	107948
Journal	Solid-State Electronics
Volume	175
DOIs	https://doi.org/10.1016/j.sse.2020.107948
State	Published - Jan 2021

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Body effect
Flexible display
LTPS TFT
Polyimide, PI
SPICE model
Simulation guideline
Transient body effect

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10.1016/j.sse.2020.107948

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abstract = "This work investigates the transient current in the subthreshold region of a low-temperature polycrystalline silicon thin-film transistor (LTPS TFT) on a polyimide (PI) substrate. The measurement of this current shows an instability that is not seen in the device on a glass substrate; the instability appears as a current variation under constant voltage and overshoot or undershoot under external stress voltage transitions. To explain this effect for a TFT on a PI substrate, a transient body effect (TBE) is suggested due to a threshold voltage shift caused by the charge distribution inside the substrate. A SPICE model is proposed based on this concept, and it shows excellent agreement with device measurements. The model offers a simulation guideline for LTPS TFTs on PI substrates.",

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AU - Lee, Taekyeong

AU - Park, Jisun

AU - Shin, Hyungsoon

PY - 2021/1

Y1 - 2021/1

N2 - This work investigates the transient current in the subthreshold region of a low-temperature polycrystalline silicon thin-film transistor (LTPS TFT) on a polyimide (PI) substrate. The measurement of this current shows an instability that is not seen in the device on a glass substrate; the instability appears as a current variation under constant voltage and overshoot or undershoot under external stress voltage transitions. To explain this effect for a TFT on a PI substrate, a transient body effect (TBE) is suggested due to a threshold voltage shift caused by the charge distribution inside the substrate. A SPICE model is proposed based on this concept, and it shows excellent agreement with device measurements. The model offers a simulation guideline for LTPS TFTs on PI substrates.

AB - This work investigates the transient current in the subthreshold region of a low-temperature polycrystalline silicon thin-film transistor (LTPS TFT) on a polyimide (PI) substrate. The measurement of this current shows an instability that is not seen in the device on a glass substrate; the instability appears as a current variation under constant voltage and overshoot or undershoot under external stress voltage transitions. To explain this effect for a TFT on a PI substrate, a transient body effect (TBE) is suggested due to a threshold voltage shift caused by the charge distribution inside the substrate. A SPICE model is proposed based on this concept, and it shows excellent agreement with device measurements. The model offers a simulation guideline for LTPS TFTs on PI substrates.

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KW - Flexible display

KW - LTPS TFT

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KW - SPICE model

KW - Simulation guideline

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Analysis of the transient body effect model for an LTPS TFT on a plastic substrate

Abstract

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Keywords

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