The Existence and Impact of Persistent Ferroelectric Domains in MAPbI3: Article No. eaas9311

Lauren Garten, David Moore, Sanjini Nanayakkara, David Ginley, Shyam Dwaraknath, Jake Wands, Angus Rockett, Brian Newell, Kristin Persson, Susan Trolier-McKinstry

Research output: Contribution to journalArticlepeer-review

77 Scopus Citations

Abstract

Methylammonium lead iodide (MAPbI3) exhibits exceptional photovoltaic performance, but there remains substantial controversy over the existence and impact of ferroelectricity on the photovoltaic response. We confirm ferroelectricity in MAPbI3 single crystals and demonstrate mediation of the electronic response by ferroelectric domain engineering. The ferroelectric response sharply declines above 57 degrees C, consistent with the tetragonal-to-cubic phase transition. Concurrent band excitation piezoresponse force microscopy-contact Kelvin probe force microscopy shows that the measured response is not dominated by spurious electrostatic interactions. Large signal poling (>16 V/cm) orients the permanent polarization into large domains, which show stabilization over weeks. X-ray photoemission spectroscopy results indicate a shift of 400 meV in the binding energy of the iodine core level peaks upon poling, which is reflected in the carrier concentration results from scanning microwave impedance microscopy. The ability to control the ferroelectric response provides routes to increase device stability and photovoltaic performance through domain engineering.
Original languageAmerican English
Number of pages9
JournalScience Advances
Volume5
Issue number1
DOIs
StatePublished - 2019

NREL Publication Number

  • NREL/JA-5K00-68090

Keywords

  • ferroelectricity
  • MAPbI3
  • photovoltaics

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