Extending the spectral absorption of dye-sensitized solar cells from the visible into near-infrared and ultra-violet range enables the minimization of non-absorption loss of solar photons. Here, we report a viable strategy to implement simultaneously near-infrared upconversion and ultra-violet downconversion for dye-sensitized solar cells through constructing a type of upconversion-core/downconversion-shell-structured nanoparticles. For the first time, NaYF₄:20%Yb,2%[email protected]₄:7%Eu core/shell nanoparticles are applied to TiO₂ photoanode for fabricating near-infrared/ultra-violet-enabled dye-sensitized solar cell devices. The incorporation of designed nanoparticles into TiO₂ photoanode of dye-sensitized solar cells achieves high efficiency of 7.664% under one sun illumination, increasing the power conversion efficiency by about 13.95%. We confirm that the enhancement of overall efficiency includes 4.82% upconversion contribution, 7.58% downconversion function and 1.55% scattering effect. Our strategy opens the path for further broadening the solar spectral use to improve the performance of photovoltaic devices.

将染料敏化太阳能电池的光谱吸收范围从可见光扩展到近红外和紫外线范围，可以使太阳光子的非吸收损失最小化。在这里，我们报告了一种可行的策略，即通过构造一种上转换核/下转换壳结构的纳米粒子，同时实现染料敏化太阳能电池的近红外上转换和紫外线下转换。NaYF ₄：20％Yb，2％[email protected] ₄：7％Eu核/壳纳米颗粒首次应用于TiO ₂光电阳极，用于制造近红外/紫外线使染料敏化的太阳能电池器件。将设计的纳米颗粒掺入TiO _2中染料敏化太阳能电池的光阳极在一次阳光照射下可达到7.664％的高效率，从而将功率转换效率提高了约13.95％。我们确认总体效率的提高包括4.82％的上变频贡献，7.58％的下变频功能和1.55％的散射效应。我们的策略为进一步拓宽太阳光谱用途以改善光伏设备的性能开辟了道路。