Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Wuhan 430062, PR China.
Nanoscale. 2018 Nov 29;10(46):22003-22011. doi: 10.1039/c8nr07225f.
Extending the spectral absorption of organic-inorganic mixed-cation perovskite solar cells (PSCs) from visible light to the near-infrared (NIR) range minimizes the nonabsorption loss of solar photons. Few studies have focused on the application of high-fluorescence NaYbF4:Ho3+ upconversion nanoparticles (UCNPs) in solar cells. In this study, NaYbF4:Ho3+ UCNPs were successfully prepared using a solvothermal method. We incorporated the NaYbF4:Ho3+ UCNPs into ZrO2 as the scaffold layer for FA0.4MA0.6PbI3 perovskite solar cells. This design enabled the dual-functional effects, that is, the harvesting of NIR light and its conversion to visible light and the reduction of the electron-hole recombination rate. The effect of different amounts of NaYbF4:Ho3+ UCNPs on the device performance was investigated in detail. The best-performance devices based on optimized addition of UCNPs (40 wt%) could achieve a power conversion efficiency as high as 14.32%, an increase of 28.8% compared with conventional ZrO2 nanoparticle-based PSCs (11.12%). The design of the synergetic operation of UCNPs and ZrO2 in the mesoporous structure of PSCs enhanced the photocurrent and photovoltage. The results offered the flexibility for the device architecture and broaden the solar spectral use of UCNP-based devices.
将有机-无机混合阳离子钙钛矿太阳能电池 (PSCs) 的光谱吸收从可见光扩展到近红外 (NIR) 范围，可最大限度地减少对太阳能光子的非吸收损失。很少有研究关注高荧光 NaYbF4:Ho3+ 上转换纳米粒子 (UCNPs) 在太阳能电池中的应用。在本研究中，我们成功地使用溶剂热法制备了 NaYbF4:Ho3+ UCNPs。我们将 NaYbF4:Ho3+ UCNPs 掺入 ZrO2 中作为 FA0.4MA0.6PbI3 钙钛矿太阳能电池的支架层。这种设计实现了双重功能效应，即 NIR 光的收集及其转换为可见光和电子-空穴复合率的降低。详细研究了不同量的 NaYbF4:Ho3+ UCNPs 对器件性能的影响。基于 UCNPs（40wt%）的最佳添加量优化的器件可以实现高达 14.32%的功率转换效率，与基于常规 ZrO2 纳米粒子的 PSCs（11.12%）相比提高了 28.8%。UCNPs 和 ZrO2 在 PSCs 介孔结构中的协同作用设计增强了光电流和光电压。结果为器件结构提供了灵活性，并拓宽了基于 UCNP 的器件的太阳能光谱利用。
