Reaserch Of Quasi-Solid-State Electrolyte For Dye-Sensitized Solar Cells

Solar energy as a renewable resource is thought to be one of the most important new energies in 21st century. Solar cell taken semiconductor material silicon as to represent gets a booming development first. But its process is complicated and the cost is high.Dye-sensitized solar cell(DSSC) has been developing as a new kind of solar cell on the basis of nanometer technique.Cost of this kind of cell is lower and the process is easier. DSSC is thought to be one of the most promising solar cells.A new method to make quasi-solid-state electrolyte called mixture solution was put forward. The influences of components, additives and other factors on both ionic conductivity of the electrolyte and photocurrent density–photovoltage characteristics of the solar cell were studied in three electrolyte systems. The main contents are following:(1)Ethanol and acetone as solvents were prepared for the quasi-solid-state electrolyte. PVDF was used in the electrolyte as gel. It avoids poisonous solvents like acetonitrile or acrylonitrile which are harmful for environment and people. The preparation process of dye-sensitized solar cells was introduced here.The gel electrolyte prepared by this method shows the advantages of none pollution,simple preparation technology and stable performance.(2)The influences of electrolyte composition of PVDF/KI+I2 system on properties of the gel electrolyte and the dye-sensitized solar cells were studied.The ionic conductivity and photocurrent density–photovoltage characteristics were analyzed. The components ratio of electrolyte was optimized. Better quasi-solid-state electrolyte was achieved. This electrolyte system shows high ionic conductivity . Solar cell with this electrolyte shows stable photovoltaic-characteristic.But its energy conversion efficiency is low.(3)The influences of electrolyte composition of PVDF/LiI+I2 system and temperature on properties of the gel electrolyte and the dye-sensitized solar cells were studied.The ionic conductivity and photocurrent density–photovoltage characteristics were analyzed. The components ratio of electrolyte was optimized. Better quasi-solid-state electrolyte is achieved. Ionic conductivity of this electrolyte is 7.6×10-3S/cm. An energy conversion efficiency of 2.43% has been achieved.(4)TiO2 and Al2O3 nanoparticles were used to improve the electrolyte properties of PVDF/KI+I2 system. The influences of TiO2 and Al2O3 nanoparticles on performance of the gel electrolyte and the dye-sensitized solar cells were studied.The properties of quasi-solid-state electrolyte with nanoparticles show obviously improvement.The energy conversion efficiency is also increased.