ORGN 656 |
| Dye-sensitized solar cells (DSSC) have been developed using porphyrin sensitization and conductive polymers as hole transport mediators. In one type of study, the photosensitizer was a tricarboxymonoamino porphyrin derivative (TC3APP), and the usual redox electrolyte solution of a standard Grätzel cell was replaced with a solution of aniline, camphorsulfonic acid, lithium perchlorate, and polyethylene glycol. Irradiation led to a photocurrent that ultimately leveled off with an open-circuit voltage (Voc) of 0.33 V, a short-circuit current (Jsc) of 0.16 mA/cm2, a fill factor (ff) of 0.6, and an overall energy conversion efficiency of 0.8 %. We interpret this as a photoelectropolymerization of aniline, generating conductive polyaniline that serves as the hole transport system in the cell. In a second type of study, we have electrochemically polymerized tetraaminophenylporphyrin (TAPP), which is formed as a conductive polymer with high surface area. We are treating this material with carboxyporphyrin followed by TiO2 precursors, effectively generating an inverse Grätzel cell. |
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Materials, Devices, and Switches
1:00 PM-5:00 PM, Thursday, 30 March 2006 Georgia World Congress Center -- Georgia Ballroom 2, Oral
Division of Organic Chemistry |