Ferroelectricity in methylammonium lead iodide perovskite solar cells
Tobias Leonhard a b, Holger Röhm a b, Alexander Schulz a b, Susanne Wagner c, Michael J. Hoffmann c, Alexander Colsmann a b
a Light Technology Institute, Karlsruhe Institute of Technology, Germany
b Material Research Center for Energy Systems, Karlsruhe Institute of Technology, Karlsruhe, 76131, Germany
c Institute for Applied Materials – Ceramic Materials and Technologies, Karlsruhe Institute of Technology, Karlsruhe, 76131, Germany
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#MapNan19. Mapping Nanoscale Functionality with Scanning Probe Microscopy
Berlin, Germany, 2019 November 3rd - 8th
Organizer: Stefan Weber
Oral, Tobias Leonhard, presentation 308
DOI: https://doi.org/10.29363/nanoge.ngfm.2019.308
Publication date: 16th July 2019

Among the emerging photovoltaic technologies, perovskite solar cells stand out with remarkable power conversion efficiencies (PCEs) and low-cost solution processability, rivaling established technologies. Currently, the scientific community controversially discusses the importance of the ferroic properties for the exceptional performance of MAPbI3 light-harvesting layers.

In this work, we performed a comprehensive AFM study including Piezoresponse Force Microscopy (PFM) and Kelvin Probe Force Microscopy (KPFM). On large flat crystals, we find 90 nm wide ferroelectric domains of alternating in-plane polarization. Electron Backscattered Diffraction (EBSD) mapping allowed for the spatially resolved correlation of the ferroelectric patterns and the crystal orientation within the MAPbI3 thin-films. Electrical simulations provide insight into the working principle of ferroelectric MAPbI3 solar cells. Poling experiments elucidate the impact of the ferroelectric microstructure on macroscopic device properties.

Altogether, these investigations provide micro-structural target properties for MAPbI3 thin-film deposition and outline pathways forward for more efficient, eco-friendly and lead-free perovskite solar cells.

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