Dresden 2017 – wissenschaftliches Programm
CPP 13.30: Poster
Montag, 20. März 2017, 18:30–21:00, P1A
Spectroscopic investigation of trap states related to loss mechanisms in hybrid perovskite solar cells — •Sebastian Reichert, Fabian Meier, Alexander Wagenpfahl, and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany
Due to excellent electrical and optical properties of perovskite films for solar cell applications the pace of improvement related to power conversion efficiency and morphological optimisation has been unprecedented. The efficiency of methyl ammonium lead iodide (MAPI) solar cells is limited by the loss of charge carriers which is occurring within the active layer. Choosing a suitable model for those recombination mechanisms is still difficult, also due to the influence of the neighbouring transport or contact layers. We present photoluminescence transients of various MAPI thin films and compare these measurements to theoretical predictions by the charge carrier continuity equation for different recombination models. Depending on the processing conditions, the results indicate recombination assisted by tail states. The energetic trap distribution is quantified by thermally stimulated current measurements. We discuss the dominant recombination process in the examined MAPI films.