研究目的
To propose a stacking structure and its optimal design method for PV cell stacking in a triple-well CMOS process to achieve high voltage generation without significant efficiency degradation.
研究成果
The proposed PV cell stacking structure in a triple-well CMOS process, utilizing an additional current-sourcing photodiode and an optical filter, achieves high voltage generation without significant efficiency degradation. The experimental results demonstrate an output voltage of 1.6 V and a conversion efficiency of 0.27%, suitable for practical applications. Future improvements could include surface engineering techniques to further enhance efficiency.
研究不足
The study is limited by the use of a specific CMOS process (0.25-μm standard triple-well) and the need for optical short-pass filters to achieve optimal performance. The efficiency may further be improved with surface engineering techniques such as passivation layer etching, surface texturing, and antireflective coating.
1：Experimental Design and Method Selection:
The study analyzes the intrinsic limit of conventional PV cell stacking in the standard bulk CMOS process and proposes a new stacking structure using a triple-well CMOS process. It includes the use of an additional current-sourcing photodiode and an optical filter.
2：Sample Selection and Data Sources:
The test chip with four-stage stacked PV cells was fabricated using a 0.25-μm standard triple-well CMOS process.
3：25-μm standard triple-well CMOS process.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study utilizes a TSMC 0.25-μm standard triple-well CMOS process for fabrication and optical short-pass filters for controlling the wavelength range of incident light.
4：25-μm standard triple-well CMOS process for fabrication and optical short-pass filters for controlling the wavelength range of incident light.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Measurements were performed at 96 μW/mm2 incident light power of a halogen lamp under various optical short-pass filters to analyze the I–V characteristics and conversion efficiency.
5：Data Analysis Methods:
The leakage-to-source photocurrent ratio (α) and conversion efficiency were calculated based on the responsivity of the photodiodes and the maximum output power extracted from the I–V characteristics.
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