Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Solar cells based on the perovskite-structured light absorber CH3NH3PbI3 have emerged at the forefront of solution-processable photovoltaic devices.[1] Early designs utilized cell architectures very similar to those of a dye-sensitized solar cell, and deposited the perovskite within the confines of a mesoporous TiO2 anode.[2] Since then, planar heterojunctions have become much more common,[3] although TiO2 still remains one of the most common materials for the electron-selective contact. In this presentation, I will discuss our research group’s recent work utilizing ZnO as the electron transport layer in perovskite solar cells with a planar heterojunction structure. We have shown that thin films of ZnO nanoparticles can successfully replace the TiO2 interfacial layer, and that cells based on this design show power conversion efficiencies of up to 15.7%.[4] Additionally, the cell fabrication is carried out entirely at room temperature, enabling the production of flexible cells with efficiencies of up to 10.2%. We present evidence that suggests that the high efficiencies are at least partially due to the block-like morphology of the perovskite layer, which increases the interfacial surface area between the perovskite and the hole transport material.
Photograph of a flexible PET/ITO/ZnO/CH3NH3PbI3/Spiro-OMeTAD/Ag device.
1. Park, N-G. Organometal Perovskite Light Absorbers: Toward a 20% Efficiency Low-Cost Solid-State Mesoscopic Solar Cell. J. Phys. Chem. Lett. 2013, 4, 2423-2429. 2. Burschka, J. et al. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 2013, 499, 316-319. 3. Liu, M; Johnston, M. B.; Snaith, H. J. Efficient planar heterojunction perovskite solar cells by vapour deposition. Nature 2013, 501, 395-398. 4. Liu, D.; Kelly, T. L. Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques. Nat. Photonics 2013, DOI: 10.1038/nphoton.2013.342.
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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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