DRAM P-N Junction Structure With Insulating Leakage Barrier
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Solution Overview
Problem
As semiconductor fabrication technology advances, reducing the size of P-N junctions to a few nanometers leads to undesired conduction, which decreases the performance of dynamic random-access memory (DRAM) devices due to P-N junction leakage.
Innovation Solution
A memory device is designed with a semiconductor substrate, a gate structure, a doped member, and a conductive layer. An insulating layer is placed between the doped member and the active area, coupled with the conductive layer adjacent to the gate structure, to prevent P-N junction leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of P-N junction is reduced to a few nanometers, then the density of memory devices is improved, but P-N junction leakage increases significantly
Solution Approach 1:
An insulating layer is introduced as an intermediary between the P-N junction and the active area. This insulating layer acts as a mediator that blocks the harmful leakage current while allowing the P-N junction to maintain its small size for high density. The insulating layer is positioned strategically to intercept and prevent the leakage path without interfering with the normal operation of the memory device.
Solution Approach 2:
The harmful leakage current is extracted or removed from the system by introducing the insulating layer that specifically targets and blocks the leakage path. The insulating layer effectively 'takes out' the unwanted electrical conduction while preserving the desired functionality of the P-N junction for data storage.
2Reliability
If an insulating layer is added to prevent P-N junction leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulating layer is applied locally only where needed - specifically between the P-N junction and the active area - rather than throughout the entire device. This localized approach provides the necessary leakage prevention exactly where the P-N junction is present, while minimizing the addition of complex structures to the rest of the device architecture.
Solution Approach 2:
The device structure is segmented into distinct functional regions with the insulating layer creating a clear separation between the P-N junction region and the active area. This segmentation allows each component to be optimized independently - the P-N junction for high density and the insulating layer for leakage prevention - without requiring complex integration throughout the entire device.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The configuration effectively avoids P-N junction leakage, enhancing the overall performance of the memory device and improving the manufacturing process by ensuring efficient conduction pathways.
Implementation Method 1
an insulating layer disposed adjacent to the first portion of the conductive layer and between the doped member and the active area
Data Source
AI summary
The present disclosure provides a memory device having improved P-N junction and a manufacturing method thereof. The memory device includes a semiconductor substrate having a first surface and defined with an active area under the first surface, a gate structure adjacent to the active area and indented into the semiconductor substrate from the first surface, a doped member extending into the semiconductor substrate and surrounded by the active area, a conductive layer including a first portion extending into the semiconductor substrate from the first surface and a second portion disposed over the doped member and coupled to the first portion, a first insulating layer disposed adjacent to the first portion of the conductive layer and between the doped member and the active area of the semiconductor substrate, a first contact disposed over the conductive layer, and a conductive pillar disposed over the first contact.