Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel.
Nano Lett. 2012 Apr 11;12(4):2095-100. doi: 10.1021/nl300356e. Epub 2012 Apr 2.
The effect of the shape of nanocrystal sensitizers in photoelectrochemical cells is reported. CdSe quantum rods of different dimensions were effectively deposited rapidly by electrophoresis onto mesoporous TiO(2) electrodes and compared with quantum dots. Photovoltaic efficiency values of up to 2.7% were measured for the QRSSC, notably high values for TiO(2) solar cells with ex situ synthesized nanoparticle sensitizers. The quantum rod-based solar cells exhibit a red shift of the electron injection onset and charge recombination is significantly suppressed compared to dot sensitizers. The improved photoelectrochemical characteristics of the quantum rods over the dots as sensitizers is assigned to the elongated shape, allowing the build-up of a dipole moment along the rod that leads to a downward shift of the TiO(2) energy bands relative to the quantum rods, leading to improved charge injection.
报道了纳米晶敏化剂形状在光电化学电池中的作用。通过电泳将不同尺寸的 CdSe 量子棒有效且快速地沉积在介孔 TiO(2)电极上，并与量子点进行了比较。QRSSC 的光电效率值高达 2.7%，对于使用原位合成纳米颗粒敏化剂的 TiO(2)太阳能电池来说，这是非常高的值。与点敏化剂相比，基于量子棒的太阳能电池表现出电子注入起始的红移，并且电荷复合显著受到抑制。量子棒作为敏化剂的光电化学特性优于点敏化剂，这归因于其拉长的形状，使得在棒上建立了偶极矩，导致 TiO(2)能带相对于量子棒向下移动，从而改善了电荷注入。
