Key Laboratory of Jiangxi Province for Persistant Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, 330063, P. R. China.
ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12798-807. doi: 10.1021/am5027709. Epub 2014 Jul 8.
In this work, a core-shell nanostructure of samarium phosphates encapsulated into a Eu(3+)-doped silica shell has been successfully fabricated, which has been confirmed by X-ray diffraction, transmission electron microscopy (TEM), and high-resolution TEM. Moreover, we report the energy transfer process from the Sm(3+) to emitters Eu(3+) that widens the light absorption range of the hybrid solar cells (HSCs) and the strong enhancement of the electron-transport of TiO2/poly(3-hexylthiophene) (P3HT) bulk heterojunction (BHJ) HSCs by introducing the unique core-shell nanoarchitecture. Furthermore, by applying femtosecond transient absorption spectroscopy, we successfully obtain the electron transport lifetimes of BHJ systems with or without incorporating the core-shell nanophosphors (NPs). Concrete evidence has been provided that the doping of core-shell NPs improves the efficiency of electron transfers from donor to acceptor, but the hole transport almost remains unchanged. In particular, the hot electron transfer lifetime was shortened from 30.2 to 16.7 ps, i.e., more than 44% faster than pure TiO2 acceptor. Consequently, a notable power conversion efficiency of 3.30% for SmPO4@Eu(3+):SiO2 blended TiO2/P3HT HSCs is achieved at 5 wt % as compared to 1.98% of pure TiO2/P3HT HSCs. This work indicates that the core-shell NPs can efficiently broaden the absorption region, facilitate electron-transport of BHJ, and enhance photovoltaic performance of inorganic/organic HSCs.
在这项工作中，成功制备了一种钐磷酸盐核壳纳米结构，其被包裹在掺 Eu(3+)的二氧化硅壳中，这已通过 X 射线衍射、透射电子显微镜 (TEM) 和高分辨率 TEM 得到证实。此外，我们报告了从 Sm(3+)到发射体 Eu(3+)的能量转移过程，该过程拓宽了混合太阳能电池 (HSCs) 的光吸收范围，并通过引入独特的核壳纳米结构增强了 TiO2/聚(3-己基噻吩) (P3HT) 体异质结 (BHJ) HSCs 的电子传输。此外，通过应用飞秒瞬态吸收光谱，我们成功获得了掺入或未掺入核壳纳米荧光粉 (NPs) 的 BHJ 系统的电子传输寿命。有确凿的证据表明，核壳 NPs 的掺杂提高了电子从给体到受体的转移效率，但空穴传输几乎保持不变。特别是，热电子转移寿命从 30.2 ps 缩短到 16.7 ps，即比纯 TiO2 受体快 44%以上。因此，与纯 TiO2/P3HT HSCs 的 1.98%相比，SmPO4@Eu(3+):SiO2 掺杂 TiO2/P3HT HSCs 的功率转换效率达到了 3.30%。这项工作表明，核壳 NPs 可以有效地拓宽吸收区域，促进 BHJ 的电子传输，并增强无机/有机 HSCs 的光伏性能。
