Absolute energy level positions in tin- and lead-based halide perovskites

Metal halide perovskites are promising materials for future optoelectronic applications. One intriguing property, important for many applications, is the tunability of the band gap via compositional engineering. While experimental reports on changes in absorption or photoluminescence show rather good agreement for different compounds, the physical origins of these changes, namely the variations in valence and conduction band positions, are not well characterized. Here, we determine ionization energy and electron affinity values of all primary tin- and lead-based perovskites using photoelectron spectroscopy data, supported by first-principles calculations and a tight-binding analysis. We demonstrate energy…

• DF
  Deutsche Forschungsgemeinschaft

  Award: 415231147
• TU
  Technische Universität Dresden
• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek

  Award: 15CST04-2
• ER
  European Regional Development Fund