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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Perovskite and photovoltaics III (joint session HL/CPP)

CPP 61.10: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, POT 251

The Versatility of Polyelemental Perovskite Compositions — •Michael Saliba — TU Darmstadt

Perovskites have emerged as low-cost, high efficiency photovoltaics with certified efficiencies of 22.1% approaching already established technologies. The perovskites used for solar cells have an ABX3 structure where the cation A is methylammonium (MA), formamidinium (FA), or cesium (Cs); the metal B is Pb or Sn; and the halide X is Cl, Br or I. Unfortunately, single-cation perovskites often suffer from phase, temperature or humidity instabilities. This is particularly noteworthy for CsPbX3 and FAPbX3 which are stable at room temperature as a photoinactive *yellow phase* instead of the more desired photoactive *black phase* that is only stable at higher temperatures. Moreover, apart from phase stability, operating perovskite solar cells (PSCs) at elevated temperatures (of 85 °C) is required for passing industrial norms.