GaNHEMT cell structure with graphene buried source and longitudinal gate and preparation method

A graphene and source technology, applied in electrical components, semiconductor/solid-state device manufacturing, circuits, etc., can solve the problems of hidden reliability, small device threshold voltage, poor uniformity, etc., and achieve stable high threshold voltage and low Effects of on-resistance, reduced gate on-resistance, good repeatability and uniformity

CN107195674APending Publication Date: 2017-09-22BEIJING HUAJINCHUANGWEI ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-09-22

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Abstract

The invention discloses a GaNHEMT cell structure with a graphene buried source and a longitudinal gate. The source is connected with a graphene buried cooling layer through a metal material; the device adopts a longitudinal gate structure, a long transverse channel opening mode in the traditional HEMT device is turned to a short longitudinal channel opening mode, a long transverse current control channel is turned to a short longitudinal current control channel for the gate, the device uses a short gate side wall channel to realize switch control, and the on resistance of the device can be effectively reduced. A high-density cell structure can be realized, and the effective using area and the unit area power density of the device are improved; and by using the excellent thermal conductivity of the graphene, heat generated in an active area of the device can be conducted rapidly, the high-power GaNHEMT device can be realized, and the high-temperature reliability of the device can be enhanced.
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Description

technical field

[0001] The invention relates to a novel GaN HEMT cell structure with a graphene buried source and a vertical grid, belonging to the technical field of semiconductor devices. Background technique

[0002] As the core components of power converters such as DC / AC, AC / DC, DC / DC, and AC / AC, power switching devices have important application requirements in modern electronic equipment. They are important for realizing integrated control of related systems and ensuring system safety and reliability. The key core device for performance, stability and efficiency. GaN is a typical representative of the third-generation wide bandgap semiconductor material. Compared with the traditional semiconductor material Si, GaN has a wide bandgap, a large breakdown electric field, a high electron saturation drift velocity, a small dielectric constant, and good chemical stability. Features. GaN material heterostructure (typically such as AlGaN / GaN) interface has a large density of...

Examples

Embodiment Construction

[0029] The present invention will be described more fully below using examples. This invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

[0030] like Figure 4 As shown, the GaN HEMT device in this embodiment adopts the GaN HEMT cell structure of the graphene buried source and the vertical gate, including the substrate, the AlN layer and the graphene buried heat dissipation layer, the AlN isolation layer, the GaN buffer layer, channel layer and AlGaN barrier layer. A through hole to the graphene layer is etched next to the source, and the graphene buried heat dissipation layer is connected to the source of the device through the metal passing through the above through hole, which plays the role of source grounding, and utilizes the high thermal conductivity of graphene to connect the The heat generated in the channel area of ​​the device is quickly conducted away, making the temperature rise...