Quantum dot solar concentrators: an investigation of various geometries

B. Rowan, S. McCormack, J. Doran, Brian Norton
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引用次数: 11

Abstract

A Quantum Dot Solar Concentrator (QDSC) is based on the Luminescent Solar Concentrator (LSC), a concept first introduced in the 1960s. LSCs consist of a flat plate of polymer material doped with a luminescent dye. A percentage of incident insolation, absorbed and re-emitted by the dye molecules is trapped inside the plate by total internal reflection. Reflective material situated on three of the edges and the back surface increases the trapping efficiency of the plate. Through successive reflection events light is concentrated onto a photovoltaic (PV) cell positioned on the fourth edge of the plate. Degradation of luminescent dyes prevented LSCs from being fully developed. A QDSC replaces luminescent dyes with semiconductor nanocrystals known as quantum dots (QDs). Passivation of QD cores with shells of higher band gap material is expected to provide increased stability. QDs offer further advantages such as broad absorption spectra to utilize more of the solar spectrum and size tunability that allows spectral matching of the QDs emission to the peak efficiency of PV cells. Small-scale QDSCs have been fabricated using QDs bought commercially. The QDs have an emission wavelength of 600nm, close to the peak efficiency of a typical silicon PV cell. The systems were electrically characterized using a 4 cm monocrystalline PV cell optically matched to the QDSC edge with silicon oil. To investigate the effect of shape and size on concentrator efficiency, four different sized quadratic, two triangular and three circular QDSCs of various diameters were fabricated.
量子点太阳能聚光器:各种几何形状的研究
量子点太阳能聚光器(QDSC)基于发光太阳能聚光器(LSC),这是一个在20世纪60年代首次提出的概念。LSCs由掺杂发光染料的聚合物材料组成。被染料分子吸收和再发射的入射日照的一定百分比通过全内反射被捕获在板内。位于三个边缘和背面的反射材料增加了板的捕获效率。通过连续的反射事件,光被集中到位于板的第四边缘的光伏(PV)电池上。发光染料的降解阻碍了LSCs的充分发育。QDSC用称为量子点(QDs)的半导体纳米晶体取代发光染料。高带隙材料壳的QD芯钝化有望提供更高的稳定性。量子点还具有广泛的吸收光谱,可以利用更多的太阳光谱和尺寸可调性,使量子点发射的光谱与PV电池的峰值效率相匹配。利用商业上购买的量子点制备了小规模的量子点晶体。量子点的发射波长为600nm,接近典型硅光伏电池的峰值效率。该系统使用一个4厘米的单晶光伏电池与硅油的QDSC边缘进行光学匹配。为了研究形状和尺寸对聚光器效率的影响,制备了4种不同尺寸的二次型、2种三角形和3种不同直径的QDSCs。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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