Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The implementation of solution-processed organic-inorganic semiconductor led to the development of high-efficiency solar cells. In particular a new class of organometal halide perovskite (e.g. CH3NH3PbI3) has recently emerged as the most viable candidate for photovoltaic devices. [1-2]
Organometal halide perovskites represents a versatile and highly performing class of materials which can advantageously combine different interesting optical and electronic properties. They can absorb in the entire visible region, exhibits excellent transport properties and offers relatively simple preparation methods, since the possibility of direct formation on mesoscopic oxide surface.
However possibility to control their morphological properties at the nanoscale as well as the film forming prerogatives is not allowed by the so far disclosed synthetic approaches [3-4]. In addition, the immediate dissolution of solution-casted perovskite films in conventional liquid electrolytes prevents their usage in a wide range of photoelectrochemical devices and causes a rapid degradation of the cells. [5-6]
To overcome these limitations we propose a different synthetic strategy of organometal halide perovskite which moves from the idea to anchor a suitable organic moiety on the TiO2 surface (as well as on other different metal oxide semiconductors) and make the hybrid halide salt to form on it.
A complete characterization of the novel materials was carried out and the charge injection mechanisms of a lead iodide-based perovskite anchored on TiO2 have been investigated through ultra-fast time-resolved spectroscopy techniques. A preliminary batch of anchored-perovskite-based solar cells has been realized and an accurate measurement of their photovoltaic performance is still in progress.
Schematic representation of photoanode with anchored hybrid perovskite.
(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)Kim, H. S.; Lee, C. R.; Im, J. H.; Lee, K. B.; Moehl, T.; Marchioro, A.; Moon, S. J.; Humphry-Baker, R.; Yum, J. H.; Moser, J. E.; Gratzel, M.; Park, N. G. Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%. Sci. Rep. 2012, 2, 591. (3)Burschka, J.; Pellet, N.; Moon, S.-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M. Sequential deposition as a route to high-performance perovskite-sensitized solar cells, Nature 2013, 499, 316–319. (4)David B. Mitzi. Templating and structural engineering in organic-inorganic perovskites, Dalton Trans, 2001, 1-12. (5)Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells J. Am. Chem. Soc. 2009, 131, 6050−6051. (6)Im, J.-H.; Lee, C.-R.; Lee, J.-W.; Park, S.-W.; Park, N.-G. 6.5% efficient perovskite quantum-dot-sensitized solar cell. Nanoscale 2011, 3, 4088−4093.
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