Tahay Pooya, Babapour Gol Afshani Meisam, Alavi Ali, Parsa Zahra, Safari Nasser
Department of Chemistry, Shahid Beheshti University, Evin, 1983963113 Tehran, Iran.
Phys Chem Chem Phys. 2017 May 10;19(18):11187-11196. doi: 10.1039/c7cp01159h.
In order to provide a comprehensive investigation of TiO nanoparticle size in relation with different dye types in DSSCs, three sizes of TiO nanoparticles and two different dye types including a porphyrin dye (T2) and a ruthenium dye (N3) were synthesized. Steady state current-voltage (J-V) characteristics were investigated for the fabricated DSSCs and the results demonstrated that the optimum TiO nanoparticle size changed with the dye type. The obtained J-V data were interpreted by cyclic voltammetry, UV-visible absorption spectroscopy, BET measurement, DFT calculation, IPCE measurement and impedance spectroscopy. The results for the N3 dye show that the surface area of the TiO nanoparticles is a key factor for the N3 cells, which is restricted by TiO pore diameter and surface state traps. In contrast, the density of localized states of the TiO film under the LUMO state of the porphyrin dyes is the dominating factor for the performance of the solar cells, which is restricted by the surface area of the TiO nanoparticles. These obtained results represent a significant advance in the development of porphyrin, ruthenium and even solid electrolyte DSSCs.
为了全面研究染料敏化太阳能电池（DSSCs）中与不同染料类型相关的TiO纳米颗粒尺寸，合成了三种尺寸的TiO纳米颗粒以及两种不同的染料类型，包括一种卟啉染料（T2）和一种钌染料（N3）。对制备的DSSCs的稳态电流-电压（J-V）特性进行了研究，结果表明，最佳的TiO纳米颗粒尺寸随染料类型而变化。通过循环伏安法、紫外-可见吸收光谱、BET测量、密度泛函理论（DFT）计算、光电转换效率（IPCE）测量和阻抗谱对获得的J-V数据进行了解释。对于N3染料的结果表明，TiO纳米颗粒的表面积是影响N3电池的关键因素，这受到TiO孔径和表面态陷阱的限制。相比之下，卟啉染料最低未占分子轨道（LUMO）态下TiO薄膜的局域态密度是影响太阳能电池性能的主导因素，这受到TiO纳米颗粒表面积的限制。这些结果代表了卟啉、钌甚至固体电解质DSSCs发展中的重大进展。
