Memory Bit Line and Resistor Co-Formation for Stable Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor technology faces challenges in integrating multiple components on a single chip efficiently and reliably, particularly in forming transistors, memories, and resistors with small volume and high quality, as device size decreases, leading to limitations in fabricating processes.
Innovation Solution
A semiconductor memory device is designed with a substrate having active areas and isolating regions, where a resistor structure and bit line structure are formed simultaneously, including semiconductor layers, barrier layers, conductive layers, and spacers, allowing for coplanar top surfaces and shared semiconductor material, thereby simplifying the process flow and enhancing structural reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple semiconductor components are integrated on a single chip, then device functionality and operating efficiency are improved, but fabrication complexity and process limitations increase
Solution Approach 1:
The patent combines the formation of bit line structures and resistor structures into a single integrated fabrication process. The semiconductor layer is formed across both active areas and isolating regions simultaneously, and the same semiconductor material and processing steps are used for both bit lines and resistors, thereby reducing fabrication complexity while maintaining device functionality
Solution Approach 2:
The semiconductor layer serves dual functions: it forms both the bit line structures in active areas and the resistor structures in isolating regions. The same material deposition and patterning processes are used for both purposes, making the fabrication process universal and reducing the number of separate manufacturing steps required
2Area of moving object
If device size is reduced, then integration density is improved, but manufacturing precision and structural reliability deteriorate
Solution Approach 1:
The patent applies different structural configurations to different regions: bit line structures in active areas have multiple layers (semiconductor, barrier, conductive, covering) while resistor structures in isolating regions have simpler configurations. This local differentiation allows each structure to be optimized for its specific function while maintaining overall manufacturing precision
Solution Approach 2:
The chip is divided into active areas for memory circuits and isolating regions for resistors, with each region having appropriately optimized structures. This segmentation allows smaller device sizes while maintaining manufacturing precision by tailoring each structure to its specific requirements rather than using a uniform design
3Reliability
If separate fabrication processes are used for bit lines and resistors, then structural reliability is improved, but fabrication efficiency and productivity deteriorate
Solution Approach 1:
The patent merges the fabrication of bit lines and resistors into a single integrated process flow. The semiconductor layer is deposited and patterned across the entire chip simultaneously, and subsequent processing steps are applied uniformly to both bit line and resistor regions, thereby improving fabrication efficiency while maintaining structural reliability through consistent processing
Solution Approach 2:
The semiconductor layer is formed in advance across both active and isolating regions before final patterning. This preliminary formation allows both bit lines and resistors to be prepared simultaneously, and subsequent selective etching and material deposition steps then create the final differentiated structures with high efficiency
Data Source
AI summary
The present disclosure provides a semiconductor memory device and a fabricating method thereof, which includes a substrate, a bit line structure and a resistor structure. The substrate has a plurality of active areas and an isolating region. The resistor structure includes a first semiconductor layer and a first capping layer from bottom to top. The bit line structure includes a second semiconductor layer, a first conductive layer, and a second capping layer from bottom to top, wherein the first semiconductor layer and the second semiconductor layer include coplanar top surface and a same semiconductor material. In this way, the resistor formed thereby is allowable to obtain structural reliability and stable surface resistance, under a simplified process flow.