Investigation Of Organic Solar Cells Based On Phthalocyanine Metal Complexes

Solar energy has advantages of wide distribution, accessible convenience, no pollution and inexhaustible supply. Because solar energy can solve the problem of traditional energy’s exhaustion, it is a preferred energy for clean energy and renewable energy source. Solar cell can generate electrical energy through the photovoltaic effect of special material.There are inorganic solar cells, dye-sensitized solar cells and organic solar cells in the field of solar cells. Investigation of organic solar cell is the most important research priority. Because organic solar cell base on small molecule can be fabricated by the way of vacuum evaporation, the optimal organic small molecular weight materials can be selected for further development of commercial solar cells. The main processes are exciton generation, exciton diffusion and dissociation, charge transport and charge carriers collected at the electrode in the aspect of photovoltaic effect. In order to form heterojunction with high energy conversion efficiency, appropriate organic material must be selected for the purpose that the HOMO level of donor and the LUMO level of acceptor can be matched with the corresponding work function of different electrodes.Planar heterojunction solar cell based on the structure of ITO/MPc(Metal Phthalocyanine)/C60/Al is fabricated. The morphology of MPc/C60bilayers grown on ITO is analyzed by Atomic Force Microscopy. By UV-visible absorption spectrum analysis of organic thin film, the solar cell with the structure of two organic layers has good light absorption property. An independent solar cell has good photovoltaic property under the light source of specific intensity. The current density can decrease with the increased thin film of C60under the light irradiation. Meanwhile, the thickness of Cdq2layer is optimized through studying the performance of organic solar cell with cathode modified layer. Because the constraints of organic material and device’s structure, interface modification and bulk heterojunction must be utilized in order to improve the photovoltaic property of solar cell.