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Fast recovery diode and method for making same

A technology for recovering diodes and diodes, which is applied in semiconductor/solid-state device manufacturing, electrical components, circuits, etc., and can solve problems such as high reverse recovery voltage, hard reverse recovery, and adverse effects of circuits

Active Publication Date: 2016-03-02
SHENZHEN ESPIRIT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies are often difficult to achieve an ideal compromise in the parameters of the fast recovery diode
For example, the diode with P-i-N structure can shorten the reverse recovery time, but the reverse recovery is too hard (that is, di / dt is too large), which will cause too high reverse recovery voltage, even if the fast recovery diode itself does not break down and burn , will also have adverse effects on the actual application circuit

Method used

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  • Fast recovery diode and method for making same
  • Fast recovery diode and method for making same
  • Fast recovery diode and method for making same

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Embodiment Construction

[0016] Please refer to figure 2 A preferred embodiment of the fast recovery diode of the present invention includes an N-type highly doped silicon substrate 111, a first N-type doped semiconductor layer 112, a second N-type doped semiconductor layer 123, and a diode anode layer 134 , the first N-type doped semiconductor layer 112 is located between the second N-type doped semiconductor layer 123 and the N-type highly doped silicon substrate 111 . Wherein the width of the first N-type doped semiconductor layer 112 is 5 μm to 50 μm, and the doping concentration is 5e12 / cm 3 -5e14 / cm 3 . The doping concentration N of the second N-type doped semiconductor layer 123 D and the width d of the second N-type doped semiconductor layer 123 satisfy the formula (1):

[0017] where ε in formula (1) r is the dielectric constant of silicon, ε 0 is the dielectric constant of vacuum, e refers to the electric charge of a single electron, V R is the reverse bias voltage for normal opera...

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Abstract

The invention provides a fast recovery diode, which comprises an N type high-doping silicon substrate, a first N type doping semiconductor layer, a second N type doping semiconductor layer and a diode anode layer, wherein the first N type doping semiconductor layer is positioned between the second N type doping semiconductor layer and the N type high-doping silicon substrate, and the doping concentration of the first N type doping semiconductor layer is lower than the doping concentration of the second N type doping semiconductor layer. The fast recovery diode can provide the sufficient current carrier concentration during the reverse recovery, so the current fall softness can be maintained. The invention also provides a method for manufacturing the fast recovery diode.

Description

technical field [0001] The invention relates to a diode and a method for making the same. Background technique [0002] With the development of power electronics technology, the application of various frequency conversion circuits and chopper circuits continues to expand. Whether the main circuit in these power electronics circuits is a thyristor with commutation shutdown or a new type of power electronics with self-shutoff capability Devices need a diode connected in parallel with it and with a short reverse recovery time to pass the reactive current in the load while suppressing the high voltage induced by the instantaneous reverse of the load current. [0003] Accordingly, a variety of fast recovery diodes with their own characteristics have been pushed to the application market, such as sonicFRD (Fast Recovery Diodes, fast recovery diodes) from IXYS, SPT+FRD from ABB, EMCON from Infineon, HEXFRED from IR, etc. [0004] Please refer to figure 1 , which shows a fast reco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L29/36H01L29/861H01L21/329
Inventor 贾会霞
Owner SHENZHEN ESPIRIT TECH
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