Li Jiurong, Zhao Haiguang, Zhao Xiujian, Gong Xiao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China.
Nanoscale. 2021 Jun 3;13(21):9561-9569. doi: 10.1039/d1nr01908b.
Luminescent solar concentrators (LSCs) can collect solar light from a large area and concentrate it on their small-area edges mounted with solar cells for efficient solar-to-electricity conversion. Thus, LSCs show huge promise for realizing building-integrated photovoltaics because of their semi-transparency and light weight. However, the low optical efficiency of LSCs becomes a great obstacle for their application in real energy conversion. Herein, yellow emissive carbon dots with a record-breaking ultrahigh quantum yield of up to 86.4% were prepared via a simple hydrothermal approach using low-cost precursors. By combining them with red emissive carbon dots (quantum yield of 17.6%), a large area (∼100 cm2) tandem LSC was fabricated. The power conversion efficiency (PCE) of the large-area carbon dot-integrated tandem LSC reaches up to 3.8%, which is among the best reported in literature for a similar lateral size of LSCs. In particular, the tandem structure based on two laminated layers is novel, and is fit for the real structural application of keeping windows warm, where two glass slides are usually used. The high-efficiency tandem LSC using eco-friendly carbon dots as fluorophores paves way for real applications of LSCs.
发光太阳能聚光器（LSCs）可以从大面积收集太阳光，并将其集中在安装有太阳能电池的小面积边缘，以实现高效的太阳能到电能的转换。因此，由于其半透明性和轻质特性，LSCs在实现建筑集成光伏方面显示出巨大的潜力。然而，LSCs的低光学效率成为其在实际能量转换中应用的一大障碍。在此，通过使用低成本前驱体的简单水热法制备了具有高达86.4%的破纪录超高量子产率的黄色发光碳点。通过将它们与红色发光碳点（量子产率为17.6%）相结合，制备了大面积（约100平方厘米）的串联LSC。大面积碳点集成串联LSC的功率转换效率（PCE）高达3.8%，这在文献报道的类似横向尺寸的LSCs中处于最佳水平。特别是基于两个叠层的串联结构是新颖的，适用于保持窗户温暖的实际结构应用，通常使用两块载玻片。使用环保型碳点作为荧光团的高效串联LSC为LSCs的实际应用铺平了道路。
