Abstract SiO2/TiO2 core/shell nanoparticles (ST-NPs) with an ultrathin and conformal TiO2 shell were fabricated via atomic layer deposition (ALD) technique with a specially-designed rotary reactor. We successfully employed the ST-NPs as light scattering centers in a mesoporous TiO2 photoanode in quantum dot (QD)-sensitized solar cells (QDSSCs). ST-NPs enhanced the light scattering in the TiO2 photoanode without deterioration of QD loading behavior. Consequently, visible light absorbance was improved in the PbS QDs-sensitized TiO2 photoanode, and thus the photocurrent density increased from 14 to 17 mA/cm2. Detailed electron microscopy was utilized to reveal the uniqueness of the ultrathin TiO2 shell in ST-NPs, and in-depth electrochemical impedance spectroscopy divulged the increase in photogenerated carrier lifetime and improved recombination resistance for the QDSSC with ST-NPs.

中文翻译：

---

超薄 TiO2 包覆的 SiO2 纳米粒子作为量子点敏化太阳能电池的光散射中心

摘要 通过原子层沉积 (ALD) 技术和专门设计的旋转反应器制备了具有超薄和保形 TiO2 壳的 SiO2/TiO2 核/壳纳米粒子 (ST-NPs)。我们成功地将 ST-NPs 用作量子点 (QD) 敏化太阳能电池 (QDSSCs) 中介孔 TiO2 光阳极中的光散射中心。ST-NPs 增强了 TiO2 光阳极中的光散射，而不会降低 QD 负载行为。因此，PbS QDs 敏化的 TiO2 光阳极的可见光吸收率提高，光电流密度从 14 mA/cm2 增加到 17 mA/cm2。详细的电子显微镜被用来揭示 ST-NPs 中超薄 TiO2 壳的独特性，