Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: P3: Hybrid Photovoltaics and Preovskites

CPP 31.3: Poster

Dienstag, 17. März 2015, 14:00–16:00, Poster B

Investigation on morphology and optical properties of hybrid perovskites prepared on different substrates — •Amrita Mandal Bera, Dan Ralf Wargulski, Ibrahim Simsek, Sergiu Levcenco, and Thomas Unold — Helmholtz-Zentrum Berlin für Materialien und Energie

Hybrid organometal perovskites have emerged as promising solar absorber material and have exhibited solar cell efficiencies more than 19% to date. The morphology of the perovskite layer is one of the most important parameters which affect solar cell efficiency. CH3NH3PbI3 has been synthesized by the two step method by converting a PbI2 layer into perovskite by immersion in methylammoniumiodide. The perovskite films prepared on different substrates [glass, fluorine doped tin oxide (FTO), FTO with TiO2 blocking layer] have been characterized by x-ray diffraction, scanning electron microscopy and optical microscope imaging. The film morphology depends on substrate type as well as processing parameters (e.g. spinning speed, deposition time and temperature). The processing parameters have been optimized to get good surface coverage. The optical properties have been investigated by measuring absorption and photoluminescence spectra at room temperature. Despite large changes in morphology of the samples they generally exhibit a strong photoluminescence band centered around 1.6 eV.