High efficiency low cost perovskite based hybrid Solar Cells
Henry Snaith a
a University of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom
Invited Speaker, Henry Snaith, presentation 037
Publication date: 1st April 2013
Combining both ultimately low cost materials and production with a high efficiency solar technology has thus far been elusive. Low cost materials, such as organics and oxides, tend to suffer from fundamental energy losses required to separate excitons and collect free charge carriers in electronically disordered semiconductors. For organic and dye-sensitized solar cells this energy loss, can be defined by the difference between the optical band gap and the open-circuit voltage, is typically 0.65 to 0.8 eV, but for a "perfect" single junction solar cell the theoretical minimum losses, as determined by the Shockley–Queisser limit are in the region of 0.3 to 0.25 eV. Recently we have reported a new type of solution processed thin-film solar cell based on a metal-organic perovskite absorber which overcomes most of these fundamental losses, and delivers both high efficiency and promise for ultimate low cost1. Here I will present recent advances with our perovkite based solar cells, both in understanding of the fundamental processes occurring in the perovskite absorbers and in the complete solar cells, and in understanding and enhancing solar cell performance. Specific attention is paid to eliminating sintering steps in both mesosuperstured and perovskite sensitized solar cells which will lead to easier manufacture and future efficiency enhancement through multi-junction approaches. 2,3.

[1]M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami, H. J. Snaith, “Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites” Science 2012 338 (6107) 643-647. [2]J. M. Ball ,  M. M Lee ,  A. Hey and H. J. Snaith, “Low-Temperature Processed Meso-superstructured to Thin-Film Perovskite Solar Cells” Energy Environ. Sci., 2013, DOI: 10.1039/C3EE40810H [3]E. J. Crossland, N. Noel, V. Sivaram, T. Leijtens, J. A. Alexander-Webber, H. J. Snaith , “Mesoporous TiO2 single crystals delivering enhanced mobility and optoelectronic device performance” Nature 2013 495 215-219
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