Synthesis And Photovoltaic Properties Of Based On D-A Porphyrin Polymers And Triphenylamine Derivatives Organic Dyes

The solar energy is inexhaustible and clean, accounting for99%of the Earth’s energy, so solar cells have been become the focus of the development and research of scientists in the world. Compared with inorganic solar cells, organic solar cells have gained more and more attention,because of many advantages of low-cost, simple process,the designability of structure, large area with flexible devices and so on. However, the energy conversion efficiency and stability of organic solar cells is still relatively low for practical application. In order to study the working mechanism of the solar cells and improve the energy conversion efficiency, we focus on a new type of porphyrin polymer and two triphenyl amine derivatives for solar cells applications, respectively. The intermediates and target products were characterized and confirmed by1H-NMR,13C-NMR, FT-IR and MALDI-TOF. The target polymers and dyes were characterized by UV-visible absorption spectroscopy, cyclic voltammetry.In addition, we also studied the photovoltaic performance of solar cells based on porphyrin polymer and triphenyl amine derivatives. The basic situation are as follows:1. A new type of D-A porphyrin and two new D-A porphyrin-based polymers were synthesized. And the new D-A porphyrin-based polymers used in bulk heterojunction solar cells. We studied the thermal properties, photophysical properties, electrochemical properties and photovoltaic performance of the polymers. The experimental results show that the absorption spectrum is widen and the energy gap is reduced with the implantation of4,7-di(4-hexylthiophen-2-yl)benzothiadiazole group. Based on porphyrin polymer/PCBM bulk heteroj unction photovoltaic devices, the energy conversion efficiency of P1and P2reach0.32%and1.26%under the illumination of AM1.5100mW/cm2, respectively.2. Two new triphenyl amine derivatives DD1and DD2were synthesized through a series of classic reactions:Wittig-Horner, Vilsmeier-Haack reaction, Suzuki coupling and Stille coupling reactions. We studied the photophysical properties of DD1and DD2, and DD2has a higher molar absorptivity of6.5×104M-1*cm-1. Based on DD1for small molecule bulk heteroj unction solar cell devices, the energy conversion efficiency reached0.96%(Voc=0.66V, Jsc=5.06mA/cm2and FF=0.29); Based on DD2for the dye sensitizer dye-sensitized solar cells, the energy conversion efficiency reached5.56%(Voc=0.64V, Jsc=12.20mA/cm2and FF=0.71).