Han Shanshan, Chen Guo, Shou Chunhui, Peng Hao, Jin Shengli, Tu Chang-Ching
University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
Zhejiang Energy Group R&D Institute Co., Ltd. and Key Laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province, Hangzhou, Zhejiang 311121, China.
ACS Appl Mater Interfaces. 2020 Sep 30;12(39):43771-43777. doi: 10.1021/acsami.0c12717. Epub 2020 Sep 18.
We demonstrate luminescent solar concentrators (LSCs) based on colloidal silicon quantum dots (SiQDs) as UV-selective fluorophores and coupled with front-facing silicon photovoltaic cells for the solar window application. The visibly transparent LSC composed of a thin layer of liquid SiQD suspension sandwiched between two thin glass slabs constitutes the windowpane, while strips of silicon photovoltaic cells with their front surfaces adhering to the LSC rear surface form the window frame. Furthermore, the LSC perimeter is surrounded by reflecting mirrors for preventing the fluorescence from leaking out through the edges. The SiQDs dispersed in 1-octadecene selectively absorb UV light and re-emit red fluorescence with quantum efficiency about 40%. Owing to the negligible overlap between the absorbance and photoluminescence spectra, the reabsorption effect is insignificant. The front-facing silicon photovoltaic strips located at the window frame can produce electricity by harvesting not only solar radiation but also the SiQD-generated fluorescence propagating from the windowpane. For the SiQD-LSC with the total light absorbing area equal to 12 cm × 12 cm and the reflecting mirrors tilted 45°, an overall power conversion efficiency of 2.47% under simulated sunlight can be obtained of which about 6% is contributed by the SiQD fluorescence. Meanwhile, the SiQD-LSC retains high spectral quality with average visible transmission and color rendering index through the windowpane equal to 86% and 94, respectively.
我们展示了基于胶体硅量子点（SiQDs）作为紫外线选择性荧光团的发光太阳能聚光器（LSCs），并将其与用于太阳能窗户应用的前置硅光伏电池相结合。由夹在两块薄玻璃板之间的一层薄液体SiQD悬浮液组成的可见光透明LSC构成窗玻璃，而其前表面粘附在LSC后表面的硅光伏电池条形成窗框。此外，LSC周边被反射镜包围，以防止荧光从边缘泄漏出去。分散在1-十八烯中的SiQDs选择性吸收紫外线并以约40%的量子效率重新发射红色荧光。由于吸收光谱和光致发光光谱之间的重叠可忽略不计，再吸收效应不显著。位于窗框处的前置硅光伏条不仅可以通过收集太阳辐射，还可以通过收集从窗玻璃传播来的SiQD产生的荧光来发电。对于总光吸收面积等于12 cm×12 cm且反射镜倾斜4５°的SiQD-LSC，在模拟阳光下可获得2.47%的总功率转换效率，其中约6%由SiQD荧光贡献。同时，SiQD-LSC保持了高光谱质量，通过窗玻璃的平均可见光透射率和显色指数分别等于86%和94。
