Chimie-Paristech, Laboratoire d'Électrochimie, Chimie des Interfaces et modélisation pour l'énergie UMR-CNRS7575, Chimie Paristech, ENSCP, 11 rue P. et M. Curie, 75231 Paris cedex 05, France.
Chemphyschem. 2011 Sep 12;12(13):2461-7. doi: 10.1002/cphc.201100194. Epub 2011 Jul 12.
Brookite TiO(2) nanoparticles have been synthesized at low temperature by a soft solution growth method and have been used as building blocks to prepare pure brookite nanoparticle porous films. The film brookite structure was confirmed by XRD and Raman spectroscopy. By spectrophotometry, it was shown that the films had a direct band gap of 3.4 eV. After sensitization by the N719 dye, efficient cells have been produced. A best overall conversion efficiency of 5.97%, without a scattering layer, was found for the larger TiO(2) starting nanoparticles. The cell open-circuit voltage was improved compared with that of anatase cells and a lower electron diffusion coefficient was found in the photoanodes made of smaller brookite particles. Lanthanum-doped brookite nanoparticle films were also studied. They showed a marked decreased in the amount of dye loading, and hence, the solar cells had a reduced current density that was not compensated for by the increased open-circuit voltage of the cells.
锐钛矿 TiO(2) 纳米粒子已通过软溶液生长法在低温下合成，并被用作构建块来制备纯锐钛矿纳米颗粒多孔薄膜。XRD 和拉曼光谱证实了薄膜具有直接带隙为 3.4eV。通过分光光度法表明，薄膜具有 3.4eV 的直接带隙。通过 N719 染料敏化后，制备了高效电池。较大的 TiO(2)起始纳米粒子的无散射层的最佳整体转化效率为 5.97%。与锐钛矿电池相比，开路电压得到了提高，并且在由较小的锐钛矿颗粒制成的光电阳极中发现了较低的电子扩散系数。还研究了镧掺杂锐钛矿纳米颗粒薄膜。它们显示出染料负载量明显减少，因此，太阳能电池的电流密度降低，而电池的开路电压增加并没有得到补偿。
