The Role of Grain Boundaries on Ionic Defect Migration in Metal Halide Perovskites

By N. Phung, A. Al‐Ashouri, S. Meloni, Alessandro Mattoni, S. Albrecht, E. Unger, A. Merdasa, A. Abate. Advanced Energy Materials, 2020

148 citations recorded by the source corpus.

Halide perovskites are emerging as revolutionary materials for optoelectronics. Their ionic nature and the presence of mobile ionic defects within the crystal structure have a dramatic influence on the operation of thin‐film devices such as solar cells, light‐emitting diodes, and transistors. Thin films are often polycrystalline and it is still under debate how grain boundaries affect the migration of ions and corresponding ionic defects. Laser excitation during photoluminescence (PL) microscopy experiments leads to formation and subsequent migration of ionic defects, which affects the dynamics of charge carrier recombination. From the microscopic observation of lateral PL distribution, the change in the distribution of ionic defects over time can be inferred. Resolving the PL dynamics in time and space of single crystals and thin films with different grain sizes thus, provides crucial information about the influence of grain boundaries on the ionic defect movement. In conjunction with experimental observations, atomistic simulations show that defects are trapped at the grain boundaries, thus inhibiting their diffusion. Hence, with this study, a comprehensive picture highlighting a fundamental property of the material is provided while also setting a theoretical framework in which the interaction between grain boundaries and ionic defect migration can be understood.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b3abdd065cc509b2a90e2b90019a37c46219784c

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. B. Rech
2. T. Unold
3. Lukas Kegelmann
4. A. Abate
5. L. Korte
6. J. Márquez
7. D. Neher
8. M. Jošt

In Materials Chemistry

1. T. Unold
2. A. Abate
3. L. Korte
4. S. Albrecht
5. M. Stolterfoht

Citations in the corpus

• Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction (2020, background): “12 cm2 with 1-sun photon flux) represented increased stress testing on phase stability compared to full illumination because it created an outward driving force for ions from the illuminated area (45).”