Investigation on the Carrier-Storage Super-Junction Igbt: Mechanism, Characteristics, and Advantages

Li, Luping; Li, Zehong; Wu, Yuzhou; Chen, Peng; Rao, Qiansheng; Yang, Yuanzhen; Yuan, Qiang; Zhou, Rong; Ren, Min

doi:10.2139/ssrn.4512611

Cited by 1 publication

(1 citation statement)

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“…To take both advantages, there are instances where both the CSL structure and SJ structure are combined [35][36][37]. While the CSL structure exhibits an issue of decreased BV due to the concentration of the E-field caused by the highly doped CSL, the simultaneous utilization of CSL structure and SJ structure (CSL-SJ) brings about improvements in V CE(sat) , E off , and BV compared to using the CSL structure alone, owing to the unique properties of each structure [35].…”

Section: Introductionmentioning

confidence: 99%

Superjunction IGBT with split carrier storage layer

Yoon,

Shin,

Kim

et al. 2024

Semicond. Sci. Technol.

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The Insulated Gate Bipolar Transistor (IGBT) is crucial in high-voltage applications due to its characteristics like breakdown voltage (BV) and on-state voltage VCE(sat). However, its slower turn-off time, attributed to hole mobility, restricts its frequency range. Techniques such as the carrier storage layer (CSL) and super-junction (SJ) structures aim to optimize BV and VCE(sat) through hole density and field distribution. Combining CSL and SJ offers advantages, yet challenges remain regarding E-field concentration. In this work, the split CSL concept introduces a solution by optimizing BV and Eoff through effective field distribution and hole extraction acceleration respectively while maintaining VCE(sat). Split CSL, which is divided into a high doping layer and a low doping layer, reduces the burden on the gate oxide by distributing the E-field evenly when in the off-state due to the difference in doping concentration. And during turn-off, hole current is concentrated on LDL, which has relatively low resistance, thereby accelerating hole extraction. Simulation-based results showcase improvements in the proposed structure's properties. The further optimization of high doping layer (HDL) and low doping layer (LDL) concentrations enhances the structure's performance. It is clear that the split CSL structure presents potential for advancing IGBT capabilities. The application of the split CSL structure resulted in significant improvements: the turn-off time was reduced by 32.4% and the breakdown voltage increased by 32.5 V compared to conventional CSL-SJ structures. These enhancements highlight the effectiveness of the split CSL design in optimizing the IGBT’s performance attribute.

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