# An investigation on anomalous hot-carrier-induced on-resistance reduction in n-type LDMOS transistors

Jone-Fang Chen, Kuen Shiuan Tian, Shiang Yu Chen, Kuo Ming Wu, J. R. Shih, Kenneth Wu

Research output: Contribution to journalArticle

25 Citations (Scopus)

### Abstract

In this paper, on-resistance $(R-{\rm on})$ degradation induced by hot-carrier injection in n-type lateral diffused metaloxidesemiconductor transistors with shallow trench isolation (STI) in the drift region is investigated. $R-{\rm on}$ unexpectedly decreases under medium- and high-gate voltage $(V-{ \rm gs})$ stress conditions. According to experimental data and technology computer-aided-design simulation results, the mechanisms responsible for anomalous $R-{\rm on}$ shift are proposed. When the device is stressed under medium $V-{\rm gs}$, hot-hole injection and trapping occur at the STI edge closest to the channel, resulting in $R-{\rm on}$ reduction. Interface trap generation $(\Delta N-{\rm it})$ occurs at the STI edge closest to the channel and nearby drift region, leading to $R-{\rm on}$ increase. For the device stressed under high $V-{\rm gs}$, $R-{\rm on}$ reduction is also attributed to hole trapping at the STI corner closest to the channel. $\Delta N-{\rm it}$ created by hot-electron injection at the STI edge closest to the drain dominates device characteristics and leads to $R-{\rm on}$ increase eventually. Based on the proposed $R-{\rm on}$ degradation mechanisms, an $R-{\rm on}$ degradation model is discussed and verified with experimental data.

Original language English 5089423 459-464 6 IEEE Transactions on Device and Materials Reliability 9 3 https://doi.org/10.1109/TDMR.2009.2025770 Published - 2009 Sep 1

### Fingerprint

Hot carriers
Transistors
Electron injection
Hot electrons
Computer aided design
Electric potential

### All Science Journal Classification (ASJC) codes

• Electronic, Optical and Magnetic Materials
• Safety, Risk, Reliability and Quality
• Electrical and Electronic Engineering

### Cite this

Chen, Jone-Fang ; Tian, Kuen Shiuan ; Chen, Shiang Yu ; Wu, Kuo Ming ; Shih, J. R. ; Wu, Kenneth. / An investigation on anomalous hot-carrier-induced on-resistance reduction in n-type LDMOS transistors. In: IEEE Transactions on Device and Materials Reliability. 2009 ; Vol. 9, No. 3. pp. 459-464.
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An investigation on anomalous hot-carrier-induced on-resistance reduction in n-type LDMOS transistors. / Chen, Jone-Fang; Tian, Kuen Shiuan; Chen, Shiang Yu; Wu, Kuo Ming; Shih, J. R.; Wu, Kenneth.

In: IEEE Transactions on Device and Materials Reliability, Vol. 9, No. 3, 5089423, 01.09.2009, p. 459-464.

Research output: Contribution to journalArticle

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AU - Chen, Jone-Fang

AU - Tian, Kuen Shiuan

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AU - Wu, Kenneth

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