TODAY! Please post and forward to your groups: [cid:image001.jpg@01D352FB.69091C30]CENTER FOR EXCITONICS SEMINAR SERIES presents<http://www.rle.mit.edu/excitonics/>s/>: Self-oscillations in Photovoltaic, Thermoelectric and Fuel Cells November 2, 2017 at 3 pm/36-428 Robert Alicki Gdansk University/ Theoretical and Mathematical Physics [http://www.rle.mit.edu/excitonics/wp-content/uploads/2017/10/aliki.jpg] A standard textbook picture of photovoltaic/thermoelectric /fuel cells and biological engines ( e.g. proton pump) assumes a direct transformation of light, heat or chemical energy into electric current. However, this scheme is inconsistent with the basic principles of electrodynamics and thermodynamics. To solve this problem the mechanism of collective electric charge self-oscillations fed by a constant energy supply controlled by a feedback mechanism , has been proposed. These coherent oscillations play a role of a piston pumping electrons and holes against the gradient of electrochemical potential. A simple analog system - a steam engine used to propel the so-called "putt-putt boat" - is used to illustrate the physics of work generation in the discussed conversion engines (see [1] and references therein). The basic qualitative prediction of this model are: a) existence of oscillating component in a charge separation dynamics, b) emission of long-wave radiation (THz radiation for semiconductor solar cells) produced by the oscillating component, c) enhancement of photocurrent by resonant external long-wave radiation. The recent experiments with organic photovoltaic materials illuminated by laser pulses exhibit the phenomena a) and c) [2] [3] strongly supporting our theory. [1]R. Alicki , D. Gelbwaser-Klimovsky and A. Jenkins, A thermodynamic cycle for the solar cell, Ann.Phys. 378 , 71 (2017), [2]A. De Sio et. al. , Tracking the coherent generation of polaron pairs in conjugated polymers, Nat. Commun. 13742 (2016), [3]A. Bakulin et. al., Mode-selective vibrational modulation of charge transport in organic electronic devices, Nat.Commun. 8880 (2015) Robert Alicki received his MS in 1974, PhD in 1977 and was a postdoctoral research assistant from 1974-77 at the University of Gdansk. In 1977 he became an Assistant Professor and in 1994 received his full professorship at Gdansk. He is the recipient of numerous awards and fellowships from across the globe and has authored and co-authored about 120 publication and co-author of 2 monographs: "Quantum Dynamical Semigroups and Applications", Springer, Berlin 1987, II edition 2007 (with K. Lendi); "Quantum Dynamical Systems", Oxford University Press, 2001 (with M. Fannes). Research activity is devoted to mathematical physics , nonequilibrium statistical mechanics, quantum open systems, quantum dynamical systems, quantum thermodynamics, quantum information and foundations of quantum mechanics. The Center For Excitonics Is An Energy Frontier Research Center Funded By The U.S. Department Of Energy, Office Of Science And Office Of Basic Energy Sciences Light refreshments will be served.