Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.13: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Suppressed Ionic Migration in 2D-Ruddlesden-Popper Perovskite — •Cheng Li1, Antonio Guerrero2, Huan Long1, Yu Zhong1, Juan Bisquert2, Jianpu Wang3, and Sven Huettner1 — 1Organic and Hybrid Electronics, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany — 2Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castellö, Spain — 3Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
Organometal trihalide perovskite solar cells (PSCs) are still suffering from the problem of hysteresis and stability. Recently, another class of perovskite - two dimensional (2D) Ruddlesden-Popper (RP) halide layered perovskites have attracted attention. In this work, first, we fabricate 2D RP perovskites using 1-naphthylmethylamine iodide (NMAI) as the precursor. Then we characterize the built-in potential in the device using electroabsorption spectroscopy. Further, we utilize time-resolved photoluminescence (PL) image microscopy and impedance spectroscopy (IS) on perovskite films to investigate both the spatial and temporal evolution of ion migration under external electric fields. Our approach enables us to quantitatively characterize the kinetic processes and determine the mobility of these ions, which is around one order of magnitude lower compared with the one in 3D perovskite. Following that, temperature dependent J-V curve enables us to obtain the activation energy of ions inside. Hence, decrease of J-V curve hysteresis and the improvement on stability are ascribed to the suppressed ion migration.