研究目的
Investigating the impact of lighting flicker caused by PWM-driven LED on the performance of indoor amorphous Si photovoltaic cells.
研究成果
The power conversion efficiency of a-Si photovoltaic cells under PWM-driven LED illumination is determined by the peak, not the average, illumination intensity. This finding highlights a potential blind spot in the characterization of indoor photovoltaic cells, as traditional methods may underestimate performance under PWM-driven lighting.
研究不足
The study focuses on a specific type of photovoltaic cell (a-Si) and a monochromatic LED light source, which may not cover all scenarios of indoor lighting conditions. The impact of flicker on other types of photovoltaic cells or under polychromatic light sources was not investigated.
1：Experimental Design and Method Selection:
The study involved measuring the current-voltage characteristics of an a-Si photovoltaic cell under various illumination conditions from a PWM-driven LED.
2：Sample Selection and Data Sources:
A commercial a-Si photovoltaic cell AM-30-11CS from Panasonic was used.
3：List of Experimental Equipment and Materials:
Equipment included a Keithley 2400 SourceMeter, a high-power LED, a Thorlabs PM100USB light power meter with an S405C thermal power sensor head, and optical devices for uniform illumination.
4：Experimental Procedures and Operational Workflow:
The LED was driven at different PWM frequencies and duty cycles to vary illumination intensity, and the photovoltaic cell's performance was measured under these conditions.
5：Data Analysis Methods:
The photocurrent generation efficiency and power conversion efficiency were analyzed as functions of peak illumination intensity.
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