Mazloum-Ardakani Mohammad, Arazi Rezvan
Department of Chemistry, Faculty of Science, Yazd University, Yazd, 89195-741, Islamic Republic of Iran.
Heliyon. 2019 Mar 28;5(3):e01444. doi: 10.1016/j.heliyon.2019.e01444. eCollection 2019 Mar.
In this research, an azobenzenecarboxylic acid was used as a sufficient co-adsorbent in combination with N719 dye. As it is found from the results, an optimized concentration of the co-absorbent leads to the highest efficiency. The dye-sensitized solar cells (DSSCs) parameters such as short-circuit current (Jsc), open-circuit voltage (Voc) and conversion efficiency (η) were obtained -14.87 mA/cm, 0.765 V and 5.20% respectively. Based on the results, the N719/Azobenzenecarboxylic-based system shows a significant increase in Voc and Jsc, resulting in an ∼21% improvement in the efficiency. A higher conversion efficiency for the co-adsorbent-based systems was assigned to their enhanced η, which is attributed to reduced dye aggregation, higher electron injection and increased Voc. This corresponded to the improved electron density in the TiO conduction band of the photoanode and reduced charge recombination revealed through electrochemical impedance spectroscopy measurements. Also, evidence was provided for a long charge life time and a high resistance of charge recombination for the co-absorbed solar cells.
在本研究中，一种偶氮苯羧酸被用作与N719染料结合的充分共吸附剂。从结果中可以发现，共吸附剂的优化浓度导致了最高效率。获得了染料敏化太阳能电池（DSSC）的参数，如短路电流（Jsc）、开路电压（Voc）和转换效率（η），分别为-14.87 mA/cm²、0.765 V和5.20%。基于这些结果，基于N719/偶氮苯羧酸的体系在Voc和Jsc方面有显著提高，导致效率提高了约21%。基于共吸附剂的体系具有更高的转换效率归因于其增强的η，这又归因于染料聚集减少、电子注入增加和Voc提高。这与通过电化学阻抗谱测量揭示的光阳极TiO₂导带中电子密度的提高以及电荷复合的减少相对应。此外，还为共吸附太阳能电池提供了长电荷寿命和高电荷复合电阻的证据。
