研究目的
Investigating the fabrication and optimization of high aspect ratio through-silicon-vias (TSVs) electroplating for 3D inductors, focusing on the influence of current density, additive concentration, and TSV shapes on the electroplating results.
研究成果
The study concluded that increasing current density improves electroplating speed but decreases quality, and additive concentration needs to be within a suitable range for optimal results. Circular TSV shapes produced more uniform electroplating results. Optimized parameters (1.5 A/dm2 current density and 1 mL/L additive concentration) enabled the successful fabrication of a 1000-μm-high 3D air-core copper solenoid inductor, the tallest micro-inductor produced using micromachining.
研究不足
The study acknowledges the challenge of achieving complete ?lling in high-aspect-ratio TSVs and the potential for voids and seams formation during the electroplating process. It also notes the technical constraints related to current density and additive concentration optimization.
1:Experimental Design and Method Selection:
The study used pulsed power as the experimental power source and prepared the electroplating solution with various additive concentrations. Control variable experiments were designed to optimize the electroplating method.
2:Sample Selection and Data Sources:
500-μm-thick monocrystalline silicon wafers with double-sided oxidation were used. TSV etching areas were defined and patterned using the lithography process.
3:List of Experimental Equipment and Materials:
Equipment included a plating pulse power source from Xiamen Qunji, an inductively coupled plasma (ICP) from the SPTS Company, and a magnetron sputtering machine MSP-300B. Materials included CuSO4·5H2O, H2SO4, NaCl, and additives like Cupracid Ultra Make-up, Cupracid Ultra A, and Cupracid Ultra B.
4:0B. Materials included CuSO4·5H2O, H2SO4, NaCl, and additives like Cupracid Ultra Make-up, Cupracid Ultra A, and Cupracid Ultra B.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process involved wafer cleaning, TSV etching, barrier and seed layer deposition, and copper electroplating. Pretreatment methods included ultrasonic cleaning, rinsing with deionized water, and vacuum processing.
5:Data Analysis Methods:
The growth rate and uniformity of the electroplated copper were detected using microscope observation, SEM, and a confocal displacement detector.
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