Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Recently, the research on organic photovoltaic (PV) devices has made significant progress. However, their power conversion efficiencies are still lower than those of inorganic solar cells. The main limiting factor in achieving high efficiency organic PV devices is the short exciton diffusion length in most organic semiconductors (typically a few nanometers). Therefore, a bulk heterojunction with controlled nanostructures which ensure a large D–A interface for efficient exciton dissociation in addition to a continuous conducting path for rapid charge carrier transport is highly desired for further enhancement in efficiency. So far, OPV cells based on such a controlled nanostructure have rarely been investigated It has been found that CuPc plays the active role as the donor in organic solar cell based on CuPc/ C60.
In present work we reported the self-assembled growth of vertically aligned Copper Phthalocyanine (CuPc) nanorods which are directly growth by applying electrostatic field in various situations to control the height of the nanorods. UV–Vis spectroscopy of CuPc nanorods, compared to planar CuPc, shows an improvement in light absorption within then visible range. Moreover, scanning electron microscopy (SEM) demonstrates the presence of well-arranged vertically aligned CuPc nanorods suggesting an increase in the donor–acceptor interface. X-ray diffraction (XRD) reveals the crystalline nature of these nanorods. Different organic photovoltaic cells have been fabricated using these nanorods. High current density achieved with the cell arrangement of CuPc-nanorods/C60 in comparison to regular planar CuPc/C60device. The power conversion efficiency is also doubled compared to the planar one.
The last part of lecture will address our first attempt to predict CuPc/C60 thin film stability within different self-assembly way to improve cells efficiency and reduce cell’s degradation. That is obtained when control the height of the nanorods and the crucial role of temprature will be highlighted.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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