TSV Inversion Layer Shielding for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for higher performance and capacity in electronic systems poses challenges due to device malfunctions and interference issues in semiconductor devices, particularly with through substrate/silicon vias (TSV) causing crosstalk and power consumption increases in stacked semiconductor chips.
Innovation Solution
A semiconductor device with a through via structure that includes a P-type region, a dielectric layer, and an N-type region, where the N-type region is connected to a power circuit applying a bias voltage to form an inversion layer on the P-type region, reducing interference from electric signals flowing through TSVs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If through substrate/silicon vias (TSV) are used to provide electric connections between stacked semiconductor chips, then integration density is improved, but interference and crosstalk between TSV and adjacent integrated circuits increases
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the TSV and the adjacent integrated circuit. This dielectric layer acts as an insulating barrier that blocks electromagnetic interference and crosstalk from the TSV, while allowing the TSV to maintain its electric connection function between stacked chips.
Solution Approach 2:
The dielectric layer is selectively formed only in the region adjacent to the integrated circuit, not throughout the entire substrate. This localized approach provides interference shielding where needed while minimizing impact on other areas of the device.
2Reliability
If TSV with larger diameter and height are used, then electric connection between stacked chips is improved, but power consumption increases due to interference
Solution Approach 1:
The dielectric layer serves as a shielding intermediary that reduces electromagnetic interference from the TSV, thereby lowering the power consumption of adjacent integrated circuits while maintaining the TSV's reliable electric connection function.
Solution Approach 2:
The potentially harmful electromagnetic fields generated by the TSV are converted into a beneficial shielding effect. The dielectric layer captures and contains these electromagnetic fields, preventing them from interfering with adjacent circuits and causing excessive power consumption.
3Quantity of substance
If channel lengths of MOSFETs are reduced to increase integration density, then density of integration is improved, but device malfunctions occur due to short channel effect
Solution Approach 1:
Instead of continuing to reduce channel lengths in the two-dimensional plane, the patent transitions to three-dimensional stacking with TSV. This vertical dimension allows increased integration density while maintaining adequate channel lengths to avoid short channel effects.
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
This configuration minimizes interference and noise between adjacent integrated circuits, improving the operational speed and reducing power consumption by effectively shielding via electrodes with an inversion layer, thus enhancing integration density without complex voltage generation circuits.
Implementation Method 1
electric signals flowing in the via electrodes form an inversion layer on a surface of the P-type region of the semiconductor substrate facing the second portion of the dielectric layer
Data Source
AI summary
A semiconductor device and a method of fabricating the same. The semiconductor device includes a semiconductor substrate having a P-type region, on at least one main surface of which integrated circuits are formed; one or more via electrodes inserted into the P-type region of the semiconductor substrate; a dielectric layer formed between the semiconductor substrate and the via electrodes; an N-type region, which is formed in the semiconductor substrate to contact a portion of the dielectric layer and to expose other portion of the dielectric layer; and a power circuit, which is electrically connected to the N-type region and apply a bias voltage or a ground voltage thereto, such that electric signals flowing in the via electrodes form an inversion layer on a surface of the semiconductor substrate facing the exposed portion of the dielectric layer.