Blends Of Squaraine And PPV's Photocurrent Properties & Syntheses As Well As Properties Of Porphyrin Derivatives

Polymer solar cells are of interest for future applications in solar cells, compared with inorganic solar cells. Polymer materials are attractive for photovoltaics primarily through the prospect of high throughput manufacturing using reel-to-reel. Additional attractive features are the possibilities for ultra thin, flexible devices, and tuning of color through chemical structure. In this dissertation, the development of polymer solar cells and their devices was reviewed, especially for Poly(phenylene vinylene) and bulk heterojunction devices. In order to extend of the absorption spectrum of the photosensitive layer, we doped squaraine into solar cell. In addition, to improve the heteroj unction of the devices, a new double layer device was designed which contained bulk heteroj unction and double layer heterojunction. More important, the squaraine was synthesized by microwave method which was introduced by us.The UV-Vis spectra showed that, compared to the absorption of MEH-PPV, the absorption of blends of poly[2-methoxy 5-(2-ethyl hexyloxy )phenylene vinylene] (MEH-PPV) and Hydroxy Squaraine dye (HOSq) was strengthened at 600-700nm. The photoluminescence at 607nm of the blends was significantly quenched compared to that of a pristine MEH-PPV film. A single and double layer organic solar cell with blends of a MEH-PPV, squaraine dye and titanium isopropoxide, sandwiched between two electrodes, had been fabricated and measured. The fill factor of the single solar cell was 0.31 and had a power conversion efficiency of0.08% when illuminated with white light at AM=1.5. The open circuit voltage, the short circuit current of the single device was 54 mV and 1.4xlO"3mA respectively. Under the same conditions, the fill factor of the double solar cell was 0.19 and had a power conversion efficiency of 0.142%, The open circuit voltage, the short circuit current was 203 mV and 0.048 mA respectively.To obtaine the water soluble dyes and to improve the interaction between the TiC>2 and dyes, the porphyrin derivatives containing the -SO3H group were designed and synthesized. Metal Fe(II), Co(II), Ni(II), Cu(II), Zn(II) complexes of the novel porphyrins derivatives were also obtained by the reactions of the porphyrin derivatives with corresponding metal salts. The relationships between water solubilities of the porphyrin derivatives and temperature, pH were investigated by UV spectra. Their solubility in water increased along with the rising of temperture, but the pH value changed irregularly.