The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 2021
Filed:
Mar. 06, 2020
Winbond Electronics Corp., Taichung, TW;
Chih-Hao Lin, Taichung, TW;
WINBOND ELECTRONICS CORP., Taichung, TW;
Abstract
A dynamic random access memory and its manufacturing method are provided. The memory includes a buried bit line, a plurality of buried word lines, a bit line contact structure, and a conductive plug. The buried bit line is formed in a substrate. A bottom surface of the buried word line is higher than a top surface of the buried bit line. The bit line contact structure is formed on the buried bit line and has a through hole. The bit line contact structure is not in direct contact with the buried bit line. A material of the bit line contact structure is different from a material of the buried bit line. The conductive plug is formed between the bit line contact structure and the buried bit line and fills the through hole, so that the bit line contact structure and the buried bit line are electrically connected.