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Synthesis and Defect Characterization of 2D Hybrid-Perovskites
G. Fischer, K. Klose, T. Kleint, H. Stöcker, J. Beyer, J. Heitmann, M. Müller
Defects, Photoluminescence, Perovskite, Band Gap
Perovskites and Other Non-Silicon Materials and Devices, Multijunctions/Tandems
Subtopic: Perovskites
Event: 38th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BV.1.11
430 - 432
ISBN: 3-936338-78-7
Paper DOI: 10.4229/EUPVSEC20212021-3BV.1.11
0,00 EUR
Document(s): paper, poster


In addition to the now established hybrid-perovskites, materials with a 2D-perovskite structure are promising candidates for the further improvement on the way to industrial multi-junction solar cells. In this work, two synthesis routes for the preparation of 2D hybrid-perovskites have been evaluated. The 2D-perovskite [benzodiimidazolium]PbI4 was successfully synthesized via the solution method. For other perovskites, we found that the precipitation of PbI2 is kinetically favored using this method. Instead, the direct synthesis method has been successfully applied for the 2D-perovskite [benzimidazolium]2PbI4. XRD analysis confirmed the 2-dimensional perovskite structure. The photoluminescence and absorption spectra for both perovskites show a double peak and a shoulder structure, respectively. We attribute this either to an exciton with a binding energy in the range of 100 meV or a defect band which lies at this energy below the band gap. The bandgap energy of 2.1eV was determined by UV-VIS absorption and photoluminescence measurements with an adjusted Tauc model.