Dresden 2017 – wissenschaftliches Programm
CPP 13.17: Poster
Montag, 20. März 2017, 18:30–21:00, P1A
Transient absorption spectroscopy of hole transport materials for perovskite solar cells — Jonas Hölzer, Johannes Klein, Mirko Scholz, Thomas Lenzer, and •Kawon Oum — Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen
Perovskite-based photovoltaic devices consist of multilayer arrangements containing mesoporous TiO2, an organic-inorganic perovskite and a hole transport material (HTM) as central elements. We present a steady-state and time-resolved UV-Vis-NIR absorption study of such devices featuring different triarylamine-based HTMs, enabling us to quantify the efficiency and time scale of the hole transfer process. In addition, direct photoexcitation of the HTMs on mesoporous TiO2 and Al2O3 thin films and in different organic solvents is investigated to understand their photophysics. They exhibit photoinduced electron injection into TiO2 and form radical cation-radical anion pairs on Al2O3 by exciton-splitting. Implications of these processes for the performance of HTMs in photovoltaic devices will be discussed.