A novel lateral double-diffused metal–oxide semiconductor(LDMOS) with a high breakdown voltage(BV) and low specific on-resistance(Ron.sp) is proposed and investigated by simulation. It features a junction field...A novel lateral double-diffused metal–oxide semiconductor(LDMOS) with a high breakdown voltage(BV) and low specific on-resistance(Ron.sp) is proposed and investigated by simulation. It features a junction field plate(JFP) over the drift region and a partial N-buried layer(PNB) in the P-substrate. The JFP not only smoothes the surface electric field(E-field), but also brings in charge compensation between the JFP and the N-drift region, which increases the doping concentration of the N-drift region. The PNB reshapes the equipotential contours, and thus reduces the E-field peak on the drain side and increases that on the source side. Moreover, the PNB extends the depletion width in the substrate by introducing an additional vertical diode, resulting in a significant improvement on the vertical BV. Compared with the conventional LDMOS with the same dimensional parameters, the novel LDMOS has an increase in BV value by 67.4%,and a reduction in Ron.sp by 45.7% simultaneously.展开更多
An ultra-low specific on-resistance (Ron,sp) oxide trench-type silicon-on-insulator (SOI) lateral double-diffusion metal-oxide semiconductor (LDMOS) with an enhanced breakdown voltage (BV) is proposed and inve...An ultra-low specific on-resistance (Ron,sp) oxide trench-type silicon-on-insulator (SOI) lateral double-diffusion metal-oxide semiconductor (LDMOS) with an enhanced breakdown voltage (BV) is proposed and investigated by simulation. There are two key features in the proposed device: one is a U-shaped gate around the oxide trench, which extends from source to drain (UG LDMOS); the other is an N pillar and P pillar located in the trench sidewall. In the on-state, electrons accumulate along the U-shaped gate, providing a continuous low resistance current path from source to drain. The Ron,sp is thus greatly reduced and almost independent of the drift region doping concentration. In the off-state, the N and P pillars not only enhance the electric field (E-field) strength of the trench oxide, but also improve the E-field distribution in the drift region, leading to a significant improvement in the BV. The BV of 662 V and Ron,sp of 12.4 mΩ.cm2 are achieved for the proposed UG LDMOS. The BV is increased by 88.6% and the Ron,sp is reduced by 96.4%, compared with those of the conventional trench LDMOS (CT LDMOS), realizing the state-of-the-art trade-off between BV and Ron,sp.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.61376079)the Program for New Century Excellent Talents in University of Ministry of Education of China(Grant No.NCET-11-0062)the Postdoctoral Science Foundation of China(Grant Nos.2012T50771 and XM2012004)
文摘A novel lateral double-diffused metal–oxide semiconductor(LDMOS) with a high breakdown voltage(BV) and low specific on-resistance(Ron.sp) is proposed and investigated by simulation. It features a junction field plate(JFP) over the drift region and a partial N-buried layer(PNB) in the P-substrate. The JFP not only smoothes the surface electric field(E-field), but also brings in charge compensation between the JFP and the N-drift region, which increases the doping concentration of the N-drift region. The PNB reshapes the equipotential contours, and thus reduces the E-field peak on the drain side and increases that on the source side. Moreover, the PNB extends the depletion width in the substrate by introducing an additional vertical diode, resulting in a significant improvement on the vertical BV. Compared with the conventional LDMOS with the same dimensional parameters, the novel LDMOS has an increase in BV value by 67.4%,and a reduction in Ron.sp by 45.7% simultaneously.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61176069 and 61376079)the Program for New Century Excellent Talents at the University of Ministry of Education of China(Grant No.NCET-11-0062)
文摘An ultra-low specific on-resistance (Ron,sp) oxide trench-type silicon-on-insulator (SOI) lateral double-diffusion metal-oxide semiconductor (LDMOS) with an enhanced breakdown voltage (BV) is proposed and investigated by simulation. There are two key features in the proposed device: one is a U-shaped gate around the oxide trench, which extends from source to drain (UG LDMOS); the other is an N pillar and P pillar located in the trench sidewall. In the on-state, electrons accumulate along the U-shaped gate, providing a continuous low resistance current path from source to drain. The Ron,sp is thus greatly reduced and almost independent of the drift region doping concentration. In the off-state, the N and P pillars not only enhance the electric field (E-field) strength of the trench oxide, but also improve the E-field distribution in the drift region, leading to a significant improvement in the BV. The BV of 662 V and Ron,sp of 12.4 mΩ.cm2 are achieved for the proposed UG LDMOS. The BV is increased by 88.6% and the Ron,sp is reduced by 96.4%, compared with those of the conventional trench LDMOS (CT LDMOS), realizing the state-of-the-art trade-off between BV and Ron,sp.