研究目的
To develop a setup for measuring differential spectral responsivities of unifacial and bifacial solar cells under bias light conditions.
研究成果
The setup demonstrated deviations smaller than 2% over the wavelength range of 425–940 nm, with an expanded uncertainty of 2.6%. It was also tested in measurements of a bifacial cell, revealing the need for active control of the cell voltage at high intensity levels of 1000 W/m2.
研究不足
The discrepancies in the UV and IR regions are higher but still within estimated uncertainties. The setup faces challenges in measuring large bifacial solar cells due to the high resistance of the wire used to short circuit the cell.
1：Experimental Design and Method Selection:
The setup uses 30 high-brightness LEDs for generating a quasi-monochromatic light source and halogen lamps for bias-lighting conditions.
2：Sample Selection and Data Sources:
A reference cell of 2 × 2 cm2 area from Fraunhofer ISE and large 15 × 15 cm2 bifacial solar cells were used.
3：List of Experimental Equipment and Materials:
High-brightness LEDs, halogen lamps, a lock-in amplifier, a silicon trap detector, and a zero-flux current sensor.
4：Experimental Procedures and Operational Workflow:
The setup was characterized for spectral irradiances and spatial uniformities of all light sources. Validation measurements were carried out using the reference cell.
5：Data Analysis Methods:
The spectral responsivity of the solar cells was derived using a recursive analysis method.
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