Call | MOMENTOM (IRS Paris-Saclay)
PI | Olivier Plantevin (LPS Paris-Saclay)
Partners | B. Geffroy, CEA NIMBE & LPICM
Starting date & duration | 2020, 1 year
Abstract | Over the past few years, hybrid organic-inorganic perovskites have become one of the most promising low-cost alternatives to traditional semiconductors in the field of photovoltaics and light emitting devices. It combines both attractive features of organic and inorganic materials within a single composite, for instance with stronger excitonic properties and brighter luminescence. Within these emerging materials, multiple-cation mixed halide perovskites have been highlighted due to their facile band gap tunability by varying the halide composition and improved structural stability. However, even these most advanced absorber materials still suffer from instabilities due to halide ion migration under photoexcitation. We will address the origin of these puzzling opto-electronic properties with photoluminescence spectroscopy together with defect engineering. Electron and ion irradiation will be used as tools for the introduction of point defects in a controlled manner. Point defects will modify the electronic and light emitting properties of the material as well as the photo-induced halide mobility which is one of today’s challenge for improved stability in opto-electronic devices.
