两种锌卟啉聚合物自组装染料敏化太阳能电池

Self-Assembly with Two Zinc Porphyrins Coordination Polymers for Dye-Sensitized Solar Cells

合成了2种新型锌卟啉并与金属Mn(Ⅱ)构建配位聚合物(CPsx,x=1,2)。2种配位聚合物与锚定卟啉(ZnPA)通过金属-配体轴向配位自组装染料敏化太阳能电池(DSSC)。测试结果表明自组装电池具有较好的光电转换效率,特别是基于CPs2的装置具有较高的短路电流和转换效率。我们还对其光学、电化学及光电性能进行了研究,并通过透射电镜(TEM)对自组装体有效敏化在TiO2电极上进行验证。

Two new zinc porphyrin with different donor units based Mn(Ⅱ) ion coordination polymers(CPsx,x=1,2)have been designed,synthesized,and well-characterized.Two coordination polymers and anchor porphyrin(ZnPA)self-assembly by metal-ligand axial coordination to modify the nano-structured TiO2 electrode surface has been in-vestigated in photoelectrochemical device.The assembled processes of CPsx-ZnPA on TiO2 surface were as follows:a porphyrin molecule(ZnPA)as anchoring group was immobilized on the TiO2 electrode surface through carboxylic groups,then the desired dye of CPsx was bound to the anchoring group through axially coordination bonded from porphyrin central Zn􀃭ions of CPsx and the N atom of ZnPA.Our results reveal that the self-assemblies devices show significantly improved photocurrent conversion efficiency.Particularly,CPs2 based solar cell displayed a PCE(power conversion efficiency)of 1.89%,and the Jsc was 4.82 mA·cm^-2.This indicates that the supramolecular coor-dination polymers self-assembly strategy has been successfully applied in dye-sensitized solar cells(DSSC).Their optical performance and electrochemical impedance spectroscopy were also investigated to further understand the photoelectrochemical results.In addition,the assembled modes of the assemblies immobilized on TiO2 electrode sur-faces were also verified by transmission electron microscopy(TEM).