We have developed a setup for measuring differential spectral responsivities of unifacial and bifacial solar cells under bias light conditions. The setup uses 30 high-brightness LEDs for generating a quasi-monochromatic light source covering the wavelength range 290–1300 nm. Halogen lamps are used to generate bias-lighting conditions up to the irradiance level of 1000 W/m². The setup has been fully characterized for spectral irradiances and spatial uniformities of all light sources. Validation measurements carried out using a reference cell of 2 × 2 cm² area from Fraunhofer ISE demonstrated an agreement better than 2% over the wavelength range of 425–940 nm, with an expanded uncertainty of 2.6%. In the UV and IR regions, the discrepancies are higher but still within estimated uncertainties. The setup is also tested in measuring spectral responsivities of large 15 × 15 cm² bifacial solar cells. The associated problems are discussed.

中文翻译：

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太阳能电池差分光谱响应度的测量装置

我们已经开发了一种在偏光条件下测量单面和双面太阳能电池的光谱响应差异的设置。该设置使用30个高亮度LED来生成覆盖290-1300 nm波长范围的准单色光源。卤素灯用于产生高达1000 W / m ²的辐照度的偏光条件。该设置已针对所有光源的光谱辐照度和空间均匀性进行了充分表征。使用2×2 cm ²的参比池进行验证测量在425–940 nm的波长范围内，Fraunhofer ISE的面积显示出优于2％的一致性，不确定性扩大了2.6％。在紫外线和红外线区域，差异较高，但仍在估计的不确定性之内。还对设置进行了测试，以测量15×15 cm ²大型双面太阳能电池的光谱响应。讨论了相关的问题。