| dc.description.abstract | Dye-sensitized solar cells (DSCs) are the new-generation photovoltaic technologies, which have the advantages such as easy fabrication, low cost and high power conversion efficiency (PCE) under weak light or indoor lighting. In this study, we optimized the device fabrication conditions for five ruthenium complexes sensitizers (HBC-23, DUY-28, DUY-29, HBC-30 and HBC-31) and four organic dyes (BTI-4, BTI-17, BTI-19 and BTI-21) prepared in our Lab. The power conversion efficiency and the parameters affecting the photovoltaic performance of the DSCs ssenisitzed by metal complex and organic dyes were investigated. The dye loading increases and the defects of the photoelectrode reduced by adjusting the thickness and the number of TiCl4 post-treatments of the TiO2 films. Chenodeoxycholic acid (CDCA) was used as a co-adsorbent for decreasing the dye aggregation and mending the uncovered TiO2 surface. The components (LiI, BMII, GuSCN, tBP, I2) and concentration of the electrolyte were used to adjust the energy level of the TiO2 conduction band and protect the surface of TiO2 film. The back of the DSC cell is covered with an aluminum foil as the light reflection layer. The Jsc of thecell sensitized by HBC-31 increased from 13.04 mA/cm2 to 14.57 mA/cm2 by increasing the number of TiO2 post-treatment with TiCl4 form once to two times. When an aluminum foil was pasted to the counter electrode as the light reflection layer, the Jsc of the cell further increases to 16.97 mA/cm2 to reach the PCE of 7.19%. The PEC of HBC-23, DUY-28, DUY-29 and HBC-31 based devices are 8.62%, 7.89%, 7.31 and 6.46%, respectively. The Jsc of BTI-4 is 21.20 mA/cm2 and the highest PCE is 4.65%. The PCE of BTI-17, BTI-19, and BTI-21 sensitized cells are 4.56%, 0.65%, and 3.49%, respectively. | en_US |