How Physical Chemistry advances Materials Science: solid-state NMR of lead halide perovskites for optoelectronics

NaMeS students are invited to IPC PAS Seminar within Dream Chemistry Lecture Series delivered by:

Dominik Kubicki, PhD

Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland

Wednesday, 19^th December, 2018, 12.30

Assembly hall of the IPC PAS

Abstract

Organic-inorganic lead halide perovskites are a promising family of light absorbers for a new generation of LEDs and solar cells, with reported efficiencies currently exceeding 22%. The field of perovskite photovoltaics is largely driven by systematic optimization of numerous parameters affecting the performance of perovskite solar cells. Such a trial-and-error approach, not backed up by atomic-level understanding of the reasons behind successes and failures, makes rational design of new compositions with better properties extremely difficult.

Here, I will show how we use high-field multi-nuclear (¹H, ²H, ¹³C, ¹⁴N, ¹⁵N, ¹³³Cs, ⁸⁷Rb, ³⁹K) solid-state magic angle spinning NMR to provide for the first time atomic-level understanding of the different doping strategies used to improve photovoltaic performance of lead halide perovskites. These advances were largely enabled by a new solid-state method of synthesizing highly pure and crystalline lead halide perovskites: mechanosynthesis.