Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive, Singapore 117576.
ACS Appl Mater Interfaces. 2011 Jul;3(7):2383-91. doi: 10.1021/am200296f. Epub 2011 Jun 20.
In this work, enhancement of ionic conductivity and long-term stability through the addition of diphenylamine (DPA) in poly(ethylene oxide) (PEO) is demonstrated. Potassium iodide (KI) is adopted as the crystal growth inhibitor, and DPA is used as a charge transport enhancer in the electrolyte. The modified electrolyte is used with titanium dioxide (TiO2) nanoparticles, which is systematically tuned to obtain high surface area. The dye-sensitized solar cell (DSSC) showed a photocurrent of 14 mAcm2 with a total conversion efficiency of 5.8% under one sun irradiation. DPA enhances the interaction of the TiO2 nanoparticle film and the I-/I3- electrolyte leading to high ionic conductivity (3.5 × 10-3 Scm-1), without compromising on the electrochemical and mechanical stability. Electrochemical impedance spectroscopy (EIS) studies show that electron transport and electron lifetime are enhanced in the DPA added electrolyte due to reduced sublimation of iodine. The most promising feature of the electrolyte is increased device stability with 89% of the overall efficiency preserved even after 40 days.
在这项工作中，通过在聚环氧乙烷（PEO）中添加二苯胺（DPA）来提高离子电导率和长期稳定性。采用碘化钾（KI）作为晶体生长抑制剂，DPA 作为电解质中的电荷传输增强剂。用经过系统调整以获得高表面积的二氧化钛（TiO2）纳米粒子来修饰电解质。在 1 个太阳光照射下，染料敏化太阳能电池（DSSC）表现出 14 mAcm2 的光电流，总转换效率为 5.8%。DPA 增强了 TiO2 纳米颗粒薄膜与 I-/I3-电解质的相互作用，从而提高了离子电导率（3.5×10-3 Scm-1），而不会影响电化学和机械稳定性。电化学阻抗谱（EIS）研究表明，由于碘的升华减少，添加 DPA 的电解质中电子输运和电子寿命得到了提高。该电解质最有希望的特点是器件稳定性提高，即使在 40 天后，整体效率仍保持 89%。
