Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Although many materials have been used in nanostructured devices, the goal of attaining high-efficiency thin film solar cells in such a way has yet to be achieved. Most work has focused on a methylammonium lead trihalide perovskites, with a band gaps of around1.55 eV and greater. However, the use of organic hole conductors may represent a potential hurdle to the future commercialization of this type of solar cell because of their relatively high cost.While increased demand would undoubtedly lower this cost dramatically in any large scale commercial endeavour, it is likely to remain expensive due to the synthetic methods and high purity needed for photovoltaic applications.On the other hand, inorganic copper-based p-type semiconductors, such as CuSCN, offer potential hole conductors for a much lower cost. Also, these copper-based hole conductors have shown promise for use in dye-sensitized and quantum dotsensitized solar cells because they are solution-processable, wide-band-gap semiconductors with high conductivity. Perovskite based solar cells have exclusively employed organic hole conducting polymers which are often expensive, low hole mobility and low stability. In a quest to explore new inorganic hole conducting materials for these perovskite-based thin film photovoltaics, we have identified (CuSCN) as a possible alternative. XRD patterns of the TiO2/ (5AVA)(MA)PbI3 with/without CuSCN. In this work, bilayer solar cells based on methylammonium lead iodide (CH3NH3PbI3) and CuSCN, have been studied using X-ray diffraction patterns. By comparing the XRD patterns, the main peak of CH3NH3PbI3 was shifted due to the CuSCN deposition, suggesting the inter-diffusion between CuSCN and CH3NH3PbI3. Now, we found stable 2-D perovskite crystal with 5-aminovaleric acid against CuSCN deposition. In the conference, the details of photovoltaic effects will be disclosed.
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