基于CH3NH3PbI3钙钛矿量子点的荧光集光太阳能光伏器件

CH3NH3PbI3 perovskite quantum dots integrated in luminescent solar concentrators

荧光集光太阳能光伏器件作为分布式能源发电装置,具有集成到建筑物的潜力,并且可以在没有冷却和追踪系统的情况下实现高聚光比,从而降低光伏发电成本.胶体量子点被认为是一种优异的荧光集光太阳能光伏器件荧光材料,但自吸收问题仍然阻碍了量子点荧光集光太阳能光伏器件效率的提高.通过简单易操作的配体辅助再沉淀技术合成了CH3NH3PbI3钙钛矿量子点,并由注射法制得尺寸为78mm×78mm×7mm的荧光集光太阳能光伏器件.通过优化材料合成,减少了量子点材料吸收和发射光谱之间的交叠,进而抑制了光波导传输过程的自吸收损失.器件光伏性能测试结果表明,所制作的CH3NH3PbI3钙钛矿量子点荧光集光太阳能光伏器件光学效率为24.5%,光电转换效率达到3.4%,在光伏建筑一体化中具有潜在的应用前景.

Luminescent solar concentrators (LSCs) have the potential to be integrated into buildings,which can serve as distributed energy generation units and achieve a high concentrating ratio without the traditional cooling and tracing systems.Colloidal quantum dots (QDs) are promising candidates as emissive chromophores in LSCs,but self-absorption loss is still a hindrance to the enhancement of the efficiency of QD-LSCs.CH 3NH 3PbI 3 perovskite QDs were synthesized by ligand-assisted reprecipitation (LARP) technique that is low cost and convenient for scale-up fabrications.CH3NH3PbI3 perovskite QD solution was used to fabricate a relatively large size LSC with a dimension of 78 mm×78 mm×7 mm.By optimizing synthesis of CH 3NH 3PbI 3 perovskite QDs,absorption and emission spectra were tuned to minimize the overlap,thus reducing self-absorption losses in waveguide transmission.Thanks to the suppressed reabsorption,the LSC with a dimension of 78 mm×78 mm×7 mm fabricated from CH3NH3PbI3 perovskite QDs exhibited an optical efficiency as high as 24.5% and a power conversion efficiency of 3.4%.It shows that CH3NH3PbI3 perovskite QDs as suitable emitters could be excellent candidates for efficient large-area LSCs in future building-integrated photovoltaics.