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Meeting Materials Science & Technology 2020
Symposium Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
Presentation Title Implications of Ferroelectricity in Perovskite Solar Cells
Author(s) Holger Roehm, Tobias Leonhard, Michael J. Hoffmann, Alexander Colsmann
On-Site Speaker (Planned) Holger Roehm
Abstract Scope Methylammonium lead iodide (MAPbI3) is the archetypal semiconductor in organic metal halide solar cells. In the past four years, a controversial discussion took place about whether or not MAPbI3 is ferroelectric and if ferroelectricity can influence the solar cell performance. Yet, poling of domains in an external field could not be demonstrated in order to consolidate the discussion. In this work, we use Piezoresponse Force Microscopy to monitor ferroelectric poling of MAPbI3 thin-films across a lateral poling channel. Depending on the direction of the electric poling field relative to the domain polarization, domains can be narrowed, widened and moved within grains. Furthermore, we observe changes to the ferroelectric domain structure upon annealing of the thin-films resulting in improved solar cell performance. Our findings suggest that control of the ferroelectric domain structure in these light absorbing, semiconducting compounds may be essential in order to maximize performance of hybrid perovskite solar cells.
Proceedings Inclusion? Undecided


A Survey of Constrained Grain Boundary Migration Mechanisms
Advanced TEM of Interfaces and Defects in Functional Ceramics
Anisotropy at Interfaces in Rare-earth Pyrosilicates for High-temperature Coatings
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Electromigration-induced Defects' Evolution in Polycrystalline Interconnects: Insights from Phase-field Simulations
Equilibrium and Kinetic Shapes of Grains in Polycrystals
Grain Boundary Engineering ZnAl2O4 via Rare Earth (RE) Doping with Varying Ionic Radii
Implications of Ferroelectricity in Perovskite Solar Cells
Phase Stability of Sr1-xBaxMnO3 (0 ≤ x ≤ 0.5) Films Using Combinatorial Substrate Epitaxy
Relating Grain Size Distributions and Grain Boundary Excess Coverages to Complexion Transitions in Eu-doped MgAl2O4
The Impact of Metastable Grain Boundary States on Mobility in FCC Metal
Thermal Property of Diamond Thin Film on Si (100) Substrate
Vacancy-enhanced Grain Boundary Migration

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