Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
In recent years hybrid organic-inorganic perovskite solar cells have attracted the interest of photovoltaic (PV) research mainly because of high efficiencies and low synthesis cost. Though these cells have picked tremendous attention, stability of such cells under sun needs to be addressed briefly. The main objective of this study is to replace the expensive and moisture sensitive organic spiro-OMETAD layer by Cu2O as an inorganic hole transport material (HTM) to enhance the lifetime of the device and lower its cost. Energy band alignment confirms the suitability of Copper (I) Oxide as hole transport material and electron blocking layer. The fabricated inverted device structure is FTO/Cu2O(HTM)/Perovskite(CH3NH3PbX3, X¼ I)/Ag paste. At the beginning, various Cu2O thin films were deposited on FTO coated glass substrates by dc-reactive plasma sputtering using argon with different oxygen contents. The temperature of the substrate was varied between 100 and 250oC. XRD, XPS, UV-Vis, and AFM investigations revealed the detailed structural, optical, and morphological properties. Later, one step deposition technique using the spin coater was performed to grow methylammonium lead iodide films on optimized HTMs outside the glove box followed by the Ag paste as contact. IV characteristic of the cell was tested using the photo electrochemical set. The results indicate significant photo response related to short circuit current and open circuit voltage exceeding 0.3 V under illumination. Further optimization is under process to improve the interface quality. Interestingly, cells have shown better stability (no bleaching effect) even in humid condition up to 120 hours. Hence, such results are very promising for the design of perovskite solar cells with stable and inorganic Cu2O HTM.
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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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