NLDMOS器件性能优化及分析

Performance Optimization and Analysis of NLDMOS Devices

摘要:

提出一种改善n型横向双扩散金属氧化物半导体(NLDMOS)器件性能的工艺方法。该方法基于某公司0.18μm标准工艺流程,通过在NLDMOS的共源处增加一道离子注入,引出衬底电荷,以优化NLDMOS器件的击穿电压(V_b)与比导通电阻(R_sp)。选择不同的注入离子浓度与快速热退火时间,研究了器件的V_b与R_sp变化。由于离子激活效率不足,单纯增加20%的注入离子浓度,器件的耐压性能提升极小,采用增加20%注入离子浓度结合延长20s快速热退火时间的方法,NLDMOS器件的V_b提高约2.7%,同时R_sp仅增加0.9%左右。

Abstract:

A new process for improving the performance of n-LDMOS devices is proposed based on XXX's 0.18μm standard process flow. Adding an ion implantation at the common source of NLDMOS can extract the substrate charge and optimize the breakdown voltage (BV) and specific on-resistance (R_sp) of the NLDMOS devices. In this paper, by selecting different implant ion concentrations and rapid thermal annealing time, changes of BV and R_sp of the devices are studied. Because the ion activation efficiency is insufficient, simply increasing the implant ion concentration by 20%, the withstand voltage performance of the device has less improvement. By combining 20% increase in implant ion concentration with 20s rapid thermal annealing method, the BV of the NLDMOS device is increased by about 2.7%, while the R_sp is increased by only about 0.9%.