| Energy resource is the focal point of the new century, because it will become the primarycause of the conflict around the world. The traditional fossil energy resource will beexhausted and cause serious environmental pollution, which is not conducive to improvepeople’s livelihood, and not conducive to improve people’s living standards. Therefore, thedevelopment of clean renewable energy is an important measure to solve the energy crisis.As an important solar photovoltaic conversion form, dye-sensitized solar cells (DSSCs)hold the energy conversion efficiency of over7%in1991, and set off scientists’ researchboom. The energy conversion efficiency of the dye-sensitized solar cells can be comparable tosilicon solar cells. It will be become industrial production and further into thecommercialization stage in the near future, but there will be many work to do with beforesuch batteries are widely used, such as the need to improve the life expectancy of the device,develop low-cost and non-toxic dyes. On the basis of literature research, it is taken intoaccount that the organic photosensitive dye with the D-π-A system has a high molarabsorptivity, raw materials, structural can be modification easily, the lower energy gap, and soon. In addition, the highest energy conversion efficiency of the dye is the metal complexesdye which has a good stability. Therefore, after combining metal complex part and organicpart to the same molecular chain, a new photosensitive dye with the respective merits of bothmetal complex dye and organic dye can be achieved in theory.The polymeric metal complexes hold good light-heat stability and a wide absorbancerange, and such complexes have been in-depth study in the light-emitting device, but fewreports exist in the field of dye-sensitized solar cells. Therefore, we introduce organic unitsuch as carbazole, alkyl fluorene or alkoxyl benzene to hydroxyquinoline or phenanthrolinederivatives metal complexes, and get two series of D-π-A main-chain-type polymeric metalcomplexes through appropriate reaction, and then they were used as a photosensitizer intodye-sensitized solar cells in order to study the photovoltaic performance. We hope to get goodstability, high open-circuit voltage and high energy conversion efficiencies dyes, and it is ofgreat significance to broaden the field of DSSCs development.In this paper, the experimental results show that the designed and synthesized two seriesof polymeric metal complexes (P1, P2, P3and P4; PKLB-Zn, PKLW-Zn, PKLB-Cd andPKLW-Cd) have good stability; their HOMO energy level and LUMO energy levels can meetthe requirements of the photosensitizer; the energy conversion efficiencies of target productscontaining thiophene derivatives (P1, P2, P3and P4) are0.63%,0.54%,0.735%and0.571% respectively; the energy conversion efficiencies of target products containing quinolinederivatives (PKLB-Zn, PKLW-Zn, PKLB-Cd and PKLW-Cd) are2.17%,2.04%,2.45%and2.18%, respectively. The highest open circuit voltage of the dye-sensitized solar cell devicesbased on these two series of dyes is up to0.745V (PKLB-Cd). Experimental results show thatthe alkoxy benzene is a good donor groups to improve the performance of solar cells;cadmium with larger atomic radius for improving the performance of solar cells is superior tozinc. These experimental results can point out the direction for our next research work, andalso show that such a new type of polymer metal complexes broadens the thinking for thedevelopment of new dyes. |
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