Lateral Bipolar Transistor with Composite Structure

Abstract

The invention relates to a lateral bipolar transistor with a composite structure. The lateral bipolar transistor particularly comprises a substrate and a first RESURF zone arranged on the substrate, as well as a current collection zone, a base zone and an emission zone which are arranged in sequence, and further comprises a second RESURF zone used for smoothing the change of the electric field of a drift zone and a plurality of floating rings formed at the periphery of the ohmic contact zone of the current collection zone, wherein an emitting electrode is arranged on the emission zone; the floating rings are positioned on the surface of the current collection zone and close to the ohmic contact zone; through the arrangement of the second RESURF zone, the electric field of the drift zone of the lateral bipolar transistor becomes smooth, and the specific on resistance of the whole device is further reduced; space charges of the floating rings are connected into a whole with a space charge in the drift zone of the current collection zone, so that the space charge area of the drift zone is increased, gathering of the space field at the edge of the ohmic contact zone of the current collection zone is greatly reduced, and under the condition of the same length of the drift zone, higher blocking voltage can be born.

Description

Technical field

[0001] The invention relates to a power device, in particular to a lateral bipolar transistor with a composite structure. Background technique

[0002] Power semiconductor devices are also called electronic power devices. With the development of power integrated circuits, especially monolithic power integrated systems, power semiconductor devices are booming. The electrodes of the lateral power devices are located on the surface of the chip, and it is easy to achieve mutual integration with low-voltage signal circuits and other devices through internal connections. Therefore, the lateral power devices are widely used in power integrated circuits. In power integrated circuits, lateral power devices often account for more than half of the entire chip area, which is the core and key of the entire power integrated circuit. Moreover, with the development of modern power integrated circuits, higher requirements have been placed on the performance of lateral power devic...

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