Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, 530 02 Pardubice, Czech Republic.
Nanoscale. 2018 Sep 13;10(35):16601-16612. doi: 10.1039/c8nr02418a.
Herein, a new strategy to efficiently harvest photons in solar cells is presented. A solar cell heterostructure is put forward, based on a 1D conical TiO2 nanotubular scaffold of high aspect ratio, homogenously coated with a thin few nm layer of CdS light absorber using atomic layer deposition (ALD). For the first time, a large variety of conical nanotube layers with a huge span of aspect ratios was utilized and ALD was used for the preparation of a uniform CdS coating within the entire high surface area of the TiO2 nanotubes. The resulting 1D conical CdS/TiO2 tubular heterostructure acts as a sink for photons. Due to the multiple light scattering and absorption events within this nanotubular sink, a large portion of photons (nearly 80%) is converted into electrons. It is the combination of the scaffold architecture and the light absorber present on the high surface area as a very thin layer, the optimized charge transport and multiple optical effects that make this heterostructure very promising for the next generation of highly performing solar cells.
本文提出了一种在太阳能电池中高效收集光子的新策略。提出了一种基于高纵横比一维锥形 TiO2 纳米管支架的太阳能电池异质结构，该支架采用原子层沉积（ALD）均匀涂覆了几纳米厚的 CdS 光吸收层。首次利用了具有很大纵横比跨度的各种锥形纳米管层，并采用 ALD 在 TiO2 纳米管的整个高表面积内制备了均匀的 CdS 涂层。所得的 1D 锥形 CdS/TiO2 管状异质结构充当光子的汇。由于在这个纳米管汇中发生了多次光散射和吸收事件，大部分光子（近 80%）被转化为电子。正是支架结构和高表面积上存在的光吸收剂（非常薄的一层）、优化的电荷输运和多次光学效应的结合，使得这种异质结构非常有前途，有望用于下一代高性能太阳能电池。
