Mesoscopic Photosystems for Harvesting and Conversion of Sunlight

Michael Gratzel^a

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Keynote, Michael Gratzel, presentation 441
Publication date: 5th February 2015

Mesoscopic photovoltaics have emerged as credible contenders to conventional p-n junction photovoltaics [1,2]. Separating light absorption from charge carrier transport, dye sensitized solar cells (DSCs) were the first to use three-dimensional nanocrystalline junctions for solar electricity production, reaching currently a power conversion efficiency (PCE) of 13-14 % in standard air mass 1.5 sunlight. Large-scale production and commercial sales have meanwhile been launched on the multi-megawatt scale. Recently we witnessed the meteoric rise of metal halide perovskites such as CH3NH3PbI3 as powerful light harvesters [3,4]. Carrier diffusion lengths in the micron range have been measured for solution-processed perovskites [5],which now attain a certified PCE of 20.1%. Perovskite-based mesoscopic photosystem that mimic natural photosynthesis in generating fuels from sunlight [6] will also be presented.

1. M. Grätzel, Nature 414, 338 (2001). 2. A.Yella, H.-W. Lee, H. N. Tsao, C. Yi, A.Kumar Chandiran, Md.K. Nazeeruddin, EW-G .Diau,,C.-Y Yeh, S. M. Zakeeruddin and M. Grätzel Science 629, 334 (2011). 3. M. Grätzel ,Nature Materials, 4. J. Burschka, N. Pellet, S.-J. Moon, R.Humphry-Baker, P. Gao1, M K. Nazeeruddin and M. Grätzel, Nature 499, 316-319 (2013). 5. G.C Xing, N.,Mathews, S.Y. Sun, S.S. Lim, Y.M., Lam, M Grätzel., N., S. Mhaisalkar a T.C.. Sun, Science 342, 344_347 (2013). 6. J. Luo, J.-H. Im, M.T. Mayer, M. Schreier, Md.K. Nazeeruddin, N.-G. Park, S.D.Tilley, H.J. Fan, M. Grätzel, Science, 345, 1593-1596. (2014).

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