Silicon-Based 3D All-Solid-State Micro-Supercapacitor with Superior Performance.

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Energy Storage

Background:

• High-performance micro-supercapacitors (MSCs) are crucial for miniaturized electronics.
• Existing MSCs often exhibit low areal energy density and complex fabrication.
• Current methods are frequently incompatible with semiconductor manufacturing processes.

Purpose of the Study:

• To propose a scalable fabrication strategy for silicon-based 3D all-solid-state MSCs.
• To address limitations of low energy density and complex fabrication in MSCs.
• To enable MSC integration with semiconductor processing technologies.

Main Methods:

• Utilized a combination of semiconductor-based electrode processing, chemical vapor deposition, and hydrothermal growth.
• Fabricated silicon-based three-dimensional (3D) all-solid-state MSCs.
• Employed a thick silicon interdigitated electrode array for MSC construction.

Main Results:

• Achieved a maximum specific capacitance of 223.74 mF cm⁻² for individual Si/C/MnO₂ electrodes.
• Demonstrated a maximum areal energy density of 5.01 μWh cm⁻² for symmetric electrodes.
• The full 3D Si/C/MnO₂ MSC delivered high energy density (2.62 μWh cm⁻²) and power density (117.82 μW cm⁻²), with >92% capacitance retention after 4000 cycles.

Conclusions:

• The proposed scalable fabrication method successfully produces high-performance 3D MSCs.
• This silicon-based 3D MSC architecture offers significant improvements in energy density and cycle life.
• The method holds great promise for advancing 3D on-chip microscale energy storage devices.