Hydrogen-Doped Conductor Layer for DRAM Capacitor Top Electrode
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Solution Overview
Problem
Dynamic random access memory (DRAM) experiences high energy consumption due to the need for periodic refreshing of capacitor charge, which increases as speed and performance requirements rise, with the refreshing operation accounting for up to 20% of overall energy consumption.
Innovation Solution
A method involving hydrogen doping in the conductor layer above the DRAM capacitor structure is introduced to enhance recharging rates and reduce energy consumption, where a substrate with a capacitor structure is prepared, and a conductive layer is formed and doped with hydrogen through plasma doping or ion implantation, followed by the formation of a metal layer and patterning to create a top electrode plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic refreshing actions are performed to maintain capacitor charge in DRAM, then data retention is improved, but energy consumption increases significantly
Solution Approach 1:
The patent changes the chemical composition parameter of the conductor layer by introducing hydrogen atoms, which fundamentally alters the charge leakage mechanism. This parameter change reduces the refreshing frequency requirement from periodic (e.g., every 64ms) to much less frequent intervals, thereby reducing energy consumption while maintaining data retention
Solution Approach 2:
The patent replaces the conventional electrical/physical approach of frequent refreshing with a chemical approach - hydrogen doping creates a material property change that passivates charge leakage paths. This substitution transforms the problem from requiring active periodic intervention to a passive, long-term stable state
2Reliability
If the refreshing frequency is increased to maintain data integrity, then data retention is improved, but energy consumption increases
Solution Approach 1:
By changing the conductor layer's material parameters through hydrogen doping, the patent achieves a state where data integrity is maintained with much lower refreshing frequency, thereby improving refreshing efficiency and reducing the burden on the memory system
3Ease of manufacture
If conventional conductor materials are used in the capacitor structure, then manufacturing simplicity is maintained, but charge leakage occurs requiring frequent refreshing
Solution Approach 1:
The patent creates a composite conductor layer by doping conventional conductor materials with hydrogen, combining the ease of manufacturing known materials with the superior charge retention properties of hydrogen-passivated structures. This allows maintaining manufacturing simplicity while achieving improved reliability
Solution Approach 2:
The patent modifies the physical-chemical parameters of existing conductor materials through hydrogen introduction, transforming them from high-leakage conventional conductors to low-leakage hydrogen-doped conductors, thereby improving charge retention without changing the fundamental manufacturing approach
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 hydrogen doping process reduces the required energy for refreshing actions by minimizing charge loss in capacitors, thereby decreasing the refreshing frequency and overall energy consumption of DRAM devices.
Implementation Method 1
performing a hydrogen doping process to the conductive layer
Implementation Method 2
a conductive layer is formed and doped with hydrogen through plasma doping or ion implantation
Data Source
AI summary
A method of manufacturing a semiconductor device is provided, which includes the steps of providing a capacitor structure, forming a conductive layer on the capacitor structure, performing a hydrogen doping process to the conductive layer, forming a metal layer on the conductive layer after the hydrogen doping process, and patterning the metal layer and the conductive layer to forma top electrode plate.