Systems and methods for maximizing breakdown voltage in...

Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – Bidirectional rectifier with control electrode

Reexamination Certificate

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C257S605000, C257S409000, C257S452000, C257S484000, C438S624000

Reexamination Certificate

active

07667242

ABSTRACT:
Systems and methods for maximizing the breakdown voltage of a semiconductor device are described. In a multiple floating guard ring design, the spacing between two consecutive sets of floating guard rings may increase with their distance from the main junction while maintaining depletion region overlap, thereby alleviating crowding and optimally spreading the electric field leading to a breakdown voltage that is close to the intrinsic material limit. In another exemplary embodiment, fabrication of floating guard rings simultaneously with the formation of another semiconductor feature allows precise positioning of the first floating guard ring with respect to the edge of a main junction, as well as precise control of floating guard ring widths and spacings. In yet another exemplary embodiment, design of the vertical separation between doped regions of a semiconductor device adjusts the device's gate-to-source breakdown voltage without affecting the device's pinch-off voltage.

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patent: 5736457 (1998-04-01), Zhao
patent: 6294460 (2001-09-01), Subramanian et al.
patent: 6756319 (2004-06-01), Kim et al.
patent: 6998204 (2006-02-01), Furukawa et al.

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