Fig. 2.
(Color online) Potential contours of (a) double Hk, (b) single Hk and (c) previous TLDMOSTs at breakdown (10 V/div, Nd = 2.4 × 1015 cm−3 for double Hk and single Hk TLDMOSTs, Nd = 2.8 × 1014 cm−3 for previous TLDMOST).
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| Citation: |
Huan Li, Haimeng Huang, Xingbi Chen. An improved SOI trench LDMOST with double vertical high-k insulator pillars[J]. Journal of Semiconductors, 2018, 39(9): 094009. doi: 10.1088/1674-4926/39/9/094009
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H Li, H M Huang, X B Chen, An improved SOI trench LDMOST with double vertical high-k insulator pillars[J]. J. Semicond., 2018, 39(9): 094009. doi: 10.1088/1674-4926/39/9/094009.
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An improved SOI trench LDMOST with double vertical high-k insulator pillars
DOI: 10.1088/1674-4926/39/9/094009
More Information
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Abstract
An SOI trench LDMOST (TLDMOST) with ultra-low specific on-resistance (Ron,sp) is proposed. It features double vertical high-k insulator pillars (Hk1 and Hk2) in the oxide trench, which are connected to the source electrode and drain electrode, respectively. Firstly, under reverse bias voltage, most electric displacement lines produced by the charges of the depleted drift region in the source side go through the Hk1, and thus the average electric field strength under the source can be enhanced. Secondly, two additional electric field peaks are induced by the Hk1, which further modulate the electric field in the drift region under the source. Thirdly, most electric displacement lines produced by the charges of the depleted drift region in the drain side enter into the Hk2. This not only introduces one more electric field peak at the corner of the oxide trench around the Hk2, but also forms the enhanced vertical reduced surface field effect, which modulates the electric field in the drift region under the drain. With the effects of the two Hk insulator pillars, the breakdown voltage (BV) and the drift region doping concentration are significantly improved. The simulation results indicate that compared with the oxide trench LDMOST (previous TLDMOST) with the same geometry, the proposed double Hk TLDMOST enhances the BV by 86% and reduces the Ron,sp by 88%.-
Keywords:
- breakdown voltage,
- high-k,
- specific on-resistance,
- trench LDMOST
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References
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