Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Solar cells based on organo-metal halide perovskites represent the allegedly fastest developing photovoltaic technology so far, and are thus major contestants in the quest for inexpensive and high-efficiency photovoltaics.[1-3] With current record cell efficiencies exceeding 15%, perovskites are well underway to challenge silicon as the front-runner of low-cost photovoltaic materials. That is, once the large-area processing and long-term stability of such perovskite cells can be achieved. So far, the vast majority of reports have focused on efficiency enhancement, whereas the stability of the perovskite has been largely unconsidered. Yet, these perovskites are highly sensitive to humidity, and there is no clear picture of their ability to withstand elevated operating temperatures. To bring more clarity into this matter, this contribution focuses on the degradation mechanisms of organo-metal halide perovskites under the influence of different stress factors. The chemical composition of degraded perovskites resulting from mono-stress tests is investigated with X-ray photoelectron spectroscopy (XPS), allowing to pinpoint the main culprits for the decay of the perovskite. In parallel, the perovskite's crystal structure and morphology are investigated, and the correlation is made with full devices.
[1] Lee, M.M.; Teuscher, J.; Miyasaka, T.; Murakami, T.N.; Snaith, H.J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647. [2] Liu, M.; Johnston, M. B.; Snaith, H. J. Efficient planar heterojunction perovskite solar cells by vapour deposition. Nature 2013, DOI: 10.1038/nature12509. [3] Conings, B.; Baeten, L.; De Dobbelaere, C.; D'Haen, J.; Manca, J.; Boyen, H.-G. Perovskite-Based Hybrid Solar Cells Exceeding 10% Efficiency with High Reproducibility Using a Thin Film Sandwich Approach. Adv. Mater. 2013, DOI: 10.1002/adma.201304803.
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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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