Wang Xinxin, Hang Xiuhua, Bolag Altan, Yun Wu, Bao Tana, Ning Jun, Alata Hexig, Ojiyed Tegus
Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, College of Physics and Electronic Information, Inner Mongolia Normal University No 81 Zhaowuda Road, Saihan District Hohhot 010022 China
Inner Mongolia Key Laboratory for Environmental Chemistry, College of Chemistry and Environmental Science Inner Mongolia Normal University No 81 Zhaowuda Road, Saihan District Hohhot 010022 China.
RSC Adv. 2020 Dec 7;10(71):43290-43298. doi: 10.1039/d0ra08276g. eCollection 2020 Nov 27.
Aiming to explore the relationship between the molecular structure and photovoltaic performance, three pyran isomer dyes DO, DM and DP were synthesized and applied as a co-sensitizer with N719 dye in dye-sensitized solar cells (DSCs). These sensitizers were investigated by theoretical calculation, UV-vis absorption spectroscopy and cyclic voltammetry measurement to understand their structure, optical and electrochemical properties. The DSC devices based on N719 and the co-sensitizers were characterized using - tests, incident photon-to-current conversion efficiency and electrochemical impedance spectroscopy measurements. As compared to the standard N719-based DSCs, the co-sensitization system of N719 and DM with the most sterical structure exhibited an enhancement of the power conversion efficiency (PCE) by 18% from 7.60% to 8.96%. Both the short-circuit photocurrent density ( ) and open-circuit voltage ( ) of the co-sensitized systems were increased resulting from the better maintained N719 dye loading amount on TiO as well as the prevention of dye aggregation. Co-sensitization of the DO molecule with less steric hindrance reduced the desorbed N719 dye amount by half leading to a decline of the photo-harvesting ability and photocurrent generation in DSCs.
为了探索分子结构与光伏性能之间的关系，合成了三种吡喃异构体染料DO、DM和DP，并将其作为共敏化剂与N719染料应用于染料敏化太阳能电池（DSC）中。通过理论计算、紫外可见吸收光谱和循环伏安测量对这些敏化剂进行了研究，以了解它们的结构、光学和电化学性质。基于N719和共敏化剂的DSC器件通过 - 测试、入射光子到电流转换效率和电化学阻抗谱测量进行了表征。与基于标准N719的DSC相比，具有最立体结构的N719和DM的共敏化系统的功率转换效率（PCE）从7.60%提高到8.96%，提高了18%。共敏化系统的短路光电流密度（ ）和开路电压（ ）均有所增加，这是由于TiO上更好地保持了N719染料负载量以及防止了染料聚集。空间位阻较小的DO分子的共敏化使解吸的N719染料量减少了一半，导致DSC中光捕获能力和光电流产生下降。
