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Interfacial Built-In Electric Field-Driven Direct Current Generator Based on Dynamic Silicon Homojunction
Yanghua Lu1, Qiuyue Gao1, Xutao Yu1
1College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Research (Washington, D.C.)
|July 2, 2020
Summary
New dynamic homojunction generators offer a simpler way to harvest energy. These devices use the same semiconductor to convert mechanical motion into electricity, overcoming limitations of previous designs.
Area of Science:
- Materials Science
- Energy Harvesting
- Semiconductor Devices
Background:
- The Internet of Things (IoT) drives demand for sustainable energy harvesting devices.
- Dynamic heterojunction generators offer in situ energy but face complexity and energy loss due to semiconductor mismatches.
- Existing methods are complex and inefficient for wide applications.
Purpose of the Study:
- To explore dynamic homojunction generators as a simplified alternative for energy harvesting.
- To investigate the mechanism of carrier separation and energy generation in homojunctions.
- To optimize device structures for improved energy conversion efficiency.
Main Methods:
- Fabrication and systematic experimentation of dynamic homojunction generators using the same semiconductor.
- Analysis of carrier distribution, interfacial electric fields, and the "rebounding effect".
- Investigation of N-type silicon (NN Si) homojunctions with varying Fermi levels and N-i-N structures.
Main Results:
- Demonstrated directional carrier separation due to broken symmetry and interfacial electric fields.
- Achieved high current density (214.0 A/m²) and low internal impedance (3.6 kΩ) in NN Si homojunctions.
- Improved output voltage to 1.3 V in N-Si/Al₂O₃/N-Si structures via enhanced interfacial barriers.
Conclusions:
- Dynamic homojunction generators provide a simple, feasible method for converting mechanical motion into electricity.
- NN Si homojunctions exhibit superior performance due to higher carrier mobility.
- Optimized N-i-N structures enhance output voltage, making them suitable for powering electronic components.
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