Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Poster: Hybrid and Perovskite Photovoltaics
CPP 11.17: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Spectroscopic Imaging of Perovskites Thin Films — •Sebastian Baderschneider1,2, Fabian Panzer2,3, Thomas Unger2,3, Tanaji Gujar4, Mukundan Thelakkat4, Jürgen Köhler1,2, Anna Köhler2,3, and Richard Hildner1,2 — 1Experimentalphysik IV, Universität Bayreuth — 2Bayreuther Institut für Makromolekülforschung — 3Experimentalphysik II, Universität Bayreuth — 4Applied Functional Polymers, Makromolekulare Chemie I, Universität Bayreuth
The efficiency of perovskite solar cells has increased within a few years up to more than 20%. Responsible for the remarkable success of this class of solar cells are, among others, the high extinction coefficient over the whole visible range and low binding energies of the excited states allowing for efficient generation of charge carriers. Though mixed halide perovskites yield the possibility to be solution processed in a simple and cheap way, they show a high degree of crystallinity which ensures high diffusion lengths in the range of μm for both electrons and holes. Employing 2-dimensional spectroscopic imaging on thin polycrystalline perovskite films, we show that at low temperatures the crystal structure can be reversibly switched between the tetragonal and the orthorhombic phase. Moreover, we address the question whether the photoluminescence stems predominantly from the grain boundaries or the crystallites.