Synthesis, characterizatıon and application of new organic electroactive molecules for photovoltiıc devices

PEDOT:PSS is with its acidic property solves the indium atoms from ITO and indium atoms diffuses in active layer in an organic solar cell. This event causes an decreasing in solar cell efficiency. In the same strategy, SAM molecules can be used as hole injection layer. On the other hand MoO3 can be used as anode buffer layer. In this thesis it is wanted to make SAM molecules have to not absorb visible range of solar spectrum for the efficient harvesting of solar energy by donor molecule. Otherwise the HOMO level of SAM molecule have to be between work function of ITO and HOMO level of donor molecule. In this way SAM molecules which don’t absorb the visible range of solar spectrum and with the suitable HOMO levels were designed, and applied on organic solar cell. On the other hand, while the series resistance in the solar cells to be formed with the synthesized molecules decreases according to the standard, parallel resistance increase is aimed.
DSSCs were proposed instead of silicon solar cells with their easy production and low cost fabrication. The photosensitizer which is liable for the visible and near-infrared utilization of the solar light, is one of the basic components of the DSSCs. Metal free organic dyes can be thought as an alternative for the solar energy to electricity conversion in DSSCs. One of the important parameter for the dye is harvesting solar energy efficiently. If the dye absorbs all solar spectrum more energy could be harvested. Furthermore, the energy levels of dye has to be suitable with TiO2 and hole transport material. On the basis of this we designed two metal free organic dyes for DSSC, absorbing uv-visible range of solar spectrum and having proper HOMO-LUMO levels, were designed, and applied on dye sensitized solar cell.