【摘要】 可透光太阳能集中器（Luminescence solar concentrators,LSCs）具有重要的应用价值。该研究提出利用荧光和散射光双传输模式来提高基于CsPbBr₃的可透光LSCs的能量转换效率（power conversion efficiency,PCE）,详细研究了散射及集光器受光面积对LSCs性能的影响。纳米TiO₂作为散射源,在MMA（Methyl methacrylate）溶液中分散性不佳,聚合过程中会在集光片内形成1μm左右尺寸的TiO₂团聚体,导致集光片透明度下降;当TiO₂掺杂浓度质量比为0.1%时,其对CsPbBr3荧光性能的影响较小。散射能够提升LSCs性能,是因为TiO₂作散射中心提供了散射光传输模式,使CsPbBr₃&TiO₂:PMMA集光片内传输的光子数增多,从而提高了LSCs的效率。最终实验得到双传输模式CsPbBr₃&TiO₂:PMMA的LSCs,在TiO₂质量比为0.1%、尺寸为5 cm×5 cm的情况下,PCE达2.62%,相比单模式的1.94%提高了35%,Jsc提高到0.83 mA/cm²,V_oc为4.5 V,FF为70.2%。受光面积对双传输模式LSCs的性能也有影响,结果显示,由于LSCs内的传输损耗和纳米晶的重吸收,传输距离会增长,到达LSCs集光片边缘的强度则变低。根据LSCs不同受光面积与输出功率的测试和拟合结果,得到LSCs的最佳尺寸为20 cm×20 cm。更多还原

【Abstract】 Luminescence solar concentrators（LSCs） has important application value. In this paper, the dual transmission mode of fluorescence and scattered light is proposed to improve the power conversion efficiency（PCE） of transparent solar concentrators（LSCs） based on CsPbBr₃. The effects of scattering and area on the performance of LSCs are studied in detail.The results show that the dispersion of nano-TiO₂ in MMA（methyl methacrylate） solution is poor. During the polymerization process, TiO₂ aggregates with a size of about 1 μm are formed in the light collector, resulting in the decrease of the transparency of the LSCs. It is determined that when the TiO₂ doping concentration is 0.1% mass ratio, it had a little effect on the fluorescence performance of CsPbBr₃. TiO₂ is determined as the scattering center to provide the scattered light transmission mode,which increases the number of photons transmitted in CsPbBr₃&TiO₂: PMMA collector and improves the efficiency of LSCs.The LSCs of double transport mode CsPbBr₃& TiO₂: PMMA obtained in the final experiment is the mass ratio of TiO₂ being 0.1% and the size being 5 cm×5 cm. Under these conditions, the PCE reaches 2.62%, which is 35% higher than 1.94% in single mode, the JSCis 0.83 m A/cm², the V_OC is 4.5 V and the FF is 70.2%. In addition, the results show that due to the transmission loss in LSCs and the reabsorption of nanocrystals, the transmission distance increases, and the intensity reaching the edge of LSCs collector decreases. According to the test and fitting results of different light receiving area and output power of LSCs, the best size of LSCs is 20 cm × 20 cm.更多还原