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Published January 1, 2018 | Version v1
Journal article Open

Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Creators

  • 1. Delft Univ Technol, Dept Chem Engn, Maasweg 9, NL-2629 HZ Delft, Netherlands
  • 2. Julius Maximillian Univ Wurzburg, Expt Phys 6, D-97074 Wurzburg, Germany
  • 3. Ludwig Maximilians Univ Munchen, Dept Chem, Butenandtstr 11, D-81377 Munich, Germany
  • 4. Zentrum Sonnenenergie & Wasserstoff Forsch ZSW Ba, Meitnerstr 1, D-70563 Stuttgart, Germany
  • 5. TOPTICA Photon AG, Lochhamer Schlag 19, D-81266 Grafelfing, Germany
  • 6. Bavarian Ctr Appl Energy Res, Magdalene Schoch Str 3, D-97074 Wurzburg, Germany
  • 7. Newcastle Univ, Sch Elect & Elect Engn, Phys Dept, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

Description

Adding cesium (Cs) and rubidium (Rb) cations to FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3) hybrid lead halide perovskites results in a remarkable improvement in solar cell performance, but the origin of the enhancement has not been fully understood yet. In this work, time-of-flight, time-resolved microwave conductivity, and thermally stimulated current measurements are performed to elucidate the impact of the inorganic cation additives on the trap landscape and charge transport properties within perovskite solar cells. These complementary techniques allow for the assessment of both local features within the perovskite crystals and macroscopic properties of films and full devices. Strikingly, Csincorporation is shown to reduce the trap density and charge recombination rates in the perovskite layer. This is consistent with the significant improvements in the open-circuit voltage and fill factor of Cs-containing devices. By comparison, Rb-addition results in an increased charge carrier mobility, which is accompanied by a minor increase in device efficiency and reduced currentvoltage hysteresis. By mixing Cs and Rb in quadruple cation (Cs-Rb-FA-MA) perovskites, the advantages of both inorganic cations can be combined. This study provides valuable insights into the role of these additives in multiplecation perovskite solar cells, which are essential for the design of high-performance devices.

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