用于单结和多结彩色太阳能电池的高效彩色涂层
Efficient color coatings for single junction and multijunction colored solar cells
摘要：
有色太阳能电池由于涂层的反射和吸收损失而具有较低的效率。通过研究太阳能电池上不同类型的涂层，确定了影响太阳能电池效率的光谱参数。制备了一系列彩色涂层，并使用分光光度法和比色照相法进行了表征。这些涂层包括商用吸收滤光片、商用分布式布拉格反射器、实验室制造的干涉涂层和纤维素反射涂层。商业单结和多结太阳能电池用于测量颜色涂层对太阳能电池性能的影响。发现结构色导致最高的亮度与颜色损失比率。只要结构不受损，结构颜色不会褪色。单结太阳能电池中的颜色损失是材料吸收范围内反射光比例的结果。多结太阳能电池受到电流失配损耗的强烈影响，其中窄反射峰导致高效率损耗。使用纤维素纳米晶体制成的结构彩色涂层表现出低而宽的反射峰，其产生明亮的颜色并保持单结和多结太阳能电池的高性能，保持在不存在彩色涂层的情况下获得的参考功率的高达83%。
英文摘要：
Colored solar cells suffer from lower efficiency due to reflection and absorption losses by coatings. By studying different types of coatings on solar cells, the spectrum parameters impacting the solar cell efficiency were identified. A collection of color coatings was fabricated and characterized using spectrophotometry and colorimetric photography. The coatings include commercial absorption filters, commercial distributed bragg reflectors, lab-made interference coatings, and cellulose nanocrystal coatings. Commercial single junction and multijunction solar cells were used to measure the impact of the color coatings on solar cell performance. Structural colors were found to result in the highest brightness to color loss ratio. Structural colors do not fade provided that the structure is not compromised. Color loss in single junction solar cells is a result of the proportion of reflected light in the absorption range of the material. Multijunction solar cells were strongly affected by current mismatch losses, where narrow reflection peaks resulted in high efficiency losses. Structural color coatings made using cellulose nanocrystals exhibited low and broad reflection peaks that produced bright colors and maintained high performance of single junction and multijunction solar cells, retaining up to 83 % of the reference power obtained in the absence of a color coating.
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