Photochromic organic ligand additive photovoltaic devices and adaptation to solar energy efficiency

In this study, organic ligands were synthesized and a photovoltaic device was fabricated from these materials. Firstly, the synthesis of two organic molecules named 6C and 6E was carried out. In addition, these molecules were also synthesized with ruthenium complexes in order to see the effect of the metal complex. The synthesized ruthenium complexes were also named 2A and 1A, respectively. Primarily, Ultraviolet – Visible Spectroscopy (UV-Vis) measurements of the synthesized molecules were made. With the data obtained from UV-Vis measurements, the forbidden energy range was calculated and presented graphically. The absorbance peak values obtained from UV-Vis measurements of 6E, 1A, 6C and 2A materials were determined as 365nm, 365nm, 360nm and 360nm, respectively. Forbidden energy ranges were calculated as 2.7 eV, 3.12 eV, 2.82 eV and 3.12 eV, respectively. In order to examine the surface morphology of the molecules, a thin film coating was applied to the glass surface by thermal evaporation method and the surface morphology was examined by atomic force microscope (AFM). The roughness rms values obtained from AFM measurements of 6E, 1A, 6C and 2A materials were measured as 0.55, 17.8, 1.89 and 4.65, respectively. Then, photovoltaic devices, in which molecules are used as interface materials, were prepared by thermal evaporation method. Electrical measurements of the prepared photovoltaic devices were taken under dark and light. Organic and ruthenium complexes were analysed comparatively according to the chemical structures of photovoltaic devices with the data obtained from current and voltage measurements taken under light. In addition, the ideality factor, barrier height, series resistance, shunt resistance, rectification ratio and saturation current values of the material were calculated using the obtained I-V measurement data. When the results obtained with organic molecules are examined, it has been determined that all materials are light sensitive and suitable for use in the production of optoelectronic devices. However, it is considered that its use in solar cell technology will not be efficient. When the results of photovoltaic devices with the addition of ruthenium complex were examined, it was concluded that the performance of the devices increased with this molecule. All results are presented comparatively.