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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Fundamentals of Perovskite Photovoltaics (joint session CPP, DS, HL)

CPP 13.27: Poster

Montag, 20. März 2017, 18:30–21:00, P1A

Capacitance spectroscopy on perovskite solar cells and MIS devices — •David Diering^1,2, Christian M. Wolff², Charles J. Hages¹, Thomas Unold¹, and Dieter Neher² — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ²Institute of Physics and Astronomy, University of Potsdam, Potsdam, Germany

Hybrid organic-inorganic Perovskites are recently under strong focus for their tremendous rise in efficiency up to 21%. However, it is not fully understood why this class of material shows such a high performance. Capacitance spectroscopy is a powerful method to investigate defects which give rise to recombination processes and therefore influence the solar cell output.

By performing capacitance-voltage and admittance measurements on mixed perovskite {Cs/FA/MA}PbI_(3−x)Br_x solar cells and metal-insulator-semiconductor(MIS) devices we are able to get information not only about defects but other important material properties such as the dielectric constant, charge carrier type and concentration. The data supports the previous theory of slight n-type to intrinsic behaviour. Further on, evidence for a deep defect level is found.