Patents by Inventor Zeqiang Yao

Zeqiang Yao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240072160
    Abstract: A semiconductor device is disclosed herein. The semiconductor device includes a silicon carbide substrate, trench structures, mesa structures, a first oxide layer, a conductive layer, a second oxide layer, a dielectric layer, and an insulation layer. The trench structures are formed on a surface of the silicon carbide substrate. Each trench structure has sidewalls and a bottom, and each respective mesa structure is formed between the respective adjacent trench structures. The first oxide layer is formed on the sidewalls of the trench structures. The conductive layer is formed on the bottom of the trench structures and on a top surface of each mesa structure. The second oxide layer is formed on the first oxide layer and the conductive layer. The dielectric layer is formed on the second oxide layer. The insulation layer is formed on the dielectric layer.
    Type: Application
    Filed: August 23, 2023
    Publication date: February 29, 2024
    Inventors: Haifeng Yang, Zhiyong Chen, Vipindas Pala, Joel McGregor, Zeqiang Yao
  • Publication number: 20180374949
    Abstract: A method for fabricating a LDMOS device, including: forming a semiconductor substrate; forming a dielectric layer atop the semiconductor substrate and an electric conducting layer on the dielectric layer; forming a first photoresist layer on the electric conducting layer; patterning the first photoresist layer through a first mask to form a first opening; etching the electric conducting layer through the first opening; implanting dopants of a first doping type into the semiconductor substrate through the first opening to form a first body region adjacent to the surface of the semiconductor substrate, and a second body region located beneath the first body region; removing the first photoresist layer; etching the electric conducting layer using a second photoresist layer and a second mask.
    Type: Application
    Filed: August 29, 2018
    Publication date: December 27, 2018
    Inventors: Joel M. McGregor, Deming Xiao, Zeqiang Yao, Ji-Hyoung Yoo, Jeesung Jung
  • Patent number: 10090409
    Abstract: A method for fabricating a LDMOS device, including: forming a semiconductor substrate; forming a dielectric layer atop the semiconductor substrate and an electric conducting layer on the dielectric layer; forming a first photoresist layer on the electric conducting layer; patterning the first photoresist layer through a first mask to form a first opening; etching the electric conducting layer through the first opening; implanting dopants of a first doping type into the semiconductor substrate through the first opening to form a first body region adjacent to the surface of the semiconductor substrate, and a second body region located beneath the first body region; removing the first photoresist layer; etching the electric conducting layer using a second photoresist layer and a second mask.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: October 2, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Joel M. McGregor, Deming Xiao, Zeqiang Yao, Ji-Hyoung Yoo, Jeesung Jung
  • Publication number: 20180174992
    Abstract: A semiconductor device having a redistribution layer and a first coating layer. The redistribution layer is formed on a passivation layer of the semiconductor device and has sidewalls and a top surface. The first coating layer covers the sidewalls and the top surface of the redistribution layer. The first coating layer is conductive so that through a conductive bump coupled to the first coating layer, an external circuit is coupled to an electrical terminal of an integrated circuit of the semiconductor device. The first coating layer has sidewalls and a top surface. A second coating layer covers the sidewalls and a part of the top surface of the first coating layer and a part of the passivation layer.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 21, 2018
    Inventors: Fayou Yin, Zeqiang Yao, Ming Xiao, Heng Li
  • Patent number: 9935176
    Abstract: A method for fabricating a LDMOS device in a well region of a semiconductor substrate, including: etching a polysilicon layer above the well region through a window for a body region; and forming spacers at side walls of the polysilicon layer, to define positions of source regions in the well region.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: April 3, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Ji-Hyoung Yoo, Zeqiang Yao, Deming Xiao
  • Publication number: 20180090613
    Abstract: A method for fabricating a LDMOS device, including: forming a semiconductor substrate; forming a dielectric layer atop the semiconductor substrate and an electric conducting layer on the dielectric layer; forming a first photoresist layer on the electric conducting layer; patterning the first photoresist layer through a first mask to form a first opening; etching the electric conducting layer through the first opening; implanting dopants of a first doping type into the semiconductor substrate through the first opening to form a first body region adjacent to the surface of the semiconductor substrate, and a second body region located beneath the first body region; removing the first photoresist layer; etching the electric conducting layer using a second photoresist layer and a second mask.
    Type: Application
    Filed: September 28, 2016
    Publication date: March 29, 2018
    Inventors: Joel M. McGregor, Deming Xiao, Zeqiang Yao, Ji-Hyoung Yoo, Jeesung Jung
  • Publication number: 20180019199
    Abstract: A semiconductor device having a first dielectric layer and a redistribution layer. The redistribution layer has sidewalls and is formed on a passivation layer of the semiconductor device. The first dielectric layer covers the sidewalls of the redistribution layer. The first dielectric layer is insulative and has a physical property of stopping the migration of the redistribution layer.
    Type: Application
    Filed: July 7, 2017
    Publication date: January 18, 2018
    Inventors: Ming Xiao, Zeqiang Yao, Heng Li, Fayou Yin
  • Publication number: 20060022255
    Abstract: A Multi-Oxide OTP (one time programmable) device is provided having different thicknesses of the gate oxide region at the transistor side and at the capacitor side, respectively, to increase the coupling efficiency of the capacitive transistor therein and improve the OTP programming rate. The present invention can be applicable to semiconductor integrated circuits and discrete components. More particularly, to single-poly EEPROM device.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 2, 2006
    Applicant: Shanghai Hua Hong NEC Electronics Company Limited
    Inventors: Zeqiang Yao, Xiangming Xu