Synthesis And Study On The Photovoltaic Properties Of Novel Carbazole Derivatives

In comparison with the traditional silicon-based solar cells, dye-sensitized solar cells (DSSCs) are one of the most promising next-generation photovoltaic cells due to their versatile, energy-saving, and environmentally friendly nature. So far, Ru-complexes still represent the most efficient sensitizers. However, the rarity and high cost of the ruthenium metal may limit their development for large-scale applications. In comparison, various efficient organic dye-sensitizers with common metals have been extensively investigated for the construction of DSSCs, due to the many types of organic dyes, asy structure design, preparation and purification, low cost and high efficient, etc. And encouraging efficiencies have also been achieved.Carbazole is a well-known electroluminescent and hole-transporting unit due to the electron-donating capabilities associated with the nitrogen in the carbazole. Because of its excellent thermal and photochemical stability, relatively high hole mobility, and good solubility in common organic solvents, the 2,7-carbazole unit has emerged as a promising electron-donating moiety for the construction of D-A or D-π-A polymers. It was early recognized that metal chelates of 8-HQ derivatives are most super materials as an electro transporter, especially, the introduction of functional group substituting in the 5-position of 8-hydroxyquinoline have been used in many fields. As an important ligand, 1,10-phenanthroline carrying N-donor atoms and being excellent n-acceptors have shown ability to stabilize low-valence metal complexes and have marked influence on the coordination geometry. Two N atoms from the didentate ligand 1,10-phenanthroline may occupy two coordination positions of metal ions, thus the feasibility of coordination is counteracted at space, and it can be synthesized low dimensional or layer compound.In this study, we also determined and studied the UV-vis absorption spectroscopy, photoluminescence spectroscopy, cyclic voltammetry and the applications in dye-sensitized solar cells (DSSCs). The DSSCs fabricated by PZn(Q)2-C and PNi(Q)2-C exhibit good device performance with a power conversion efficiency of up to 1.11% and 0.45%, respectively under simulated AM 1.5 G solar irradiation (100 mW/cm2). They possess excellent stabilities and their thermal decomposition temperatures are 454,489,310℃for P1, P2 and P3, respectively, and their power conversion efficiency are 0.42%,0.44% and 0.28%, respectively, indicating polymeric metal complexes are suitable for the fabrication processes of optoelectronic devices.