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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Perovskites - organized by Eva M. Herzig (University of Bayreuth, Bayreuth)
CPP 7.11: Talk
Tuesday, March 23, 2021, 15:00–15:20, CPPa
Characterization of Perovskite Precursor Solutions in order to achieve High-Performance Solar Cells — •Marion Flatken1, Nga Phung1, Robert Wendt1, Armin Hoell1, and Antonio Abate1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) — 2Department of Chemical, Materials and Production Engineering, University of Naples Federico II
Despite the current success of Perovskite Solar Cells, there are still open questions how to explain intrinsic parameters in terms of stability and general photovoltaic performance of varying perovskite compositions. Deeper knowledge in coordination chemistry of the perovskite itself is one key parameter to improve and control crystallization in the solution based fabrication. Using small angle scattering we can prove, that the coordination starts in the perovskite precursor solution and differs according to the perovskite composition. The observed colloidal structures are characterized via small angle neutron scattering (SANS) and is further compared to synchrotron based small angle x-ray scattering (SAXS). Based on nuclear magnetic resonsance spectroscopy the chemical composition of the complexes can be revealed, which leads us to a possible starting mechanism for nucleation and growth in perovskite precursor solutions. In our work we compare the precursor solutions of MAPbI3 and MAPbI3 x SrI2 to a cesium containing triple cation perovskite solution, which is known to be a highly efficient and stable perovskite. Observed differences and similarities might give one reason for the divergence in photovoltaic properties of the respective full device solar cells.