Coexistence of Two Electronic Nano-Phases on a CH3NH3PbI3–xClx Surface Observed in STM Measurements
Source abstract
Abstract
Scanning tunneling microscopy is utilized to investigate the local density of states of a CH 3 NH 3 PbI 3– x Cl x perovskite in cross-sectional geometry. Two electronic phases, 10–20 nm in size, with different electronic properties inside the CH 3 NH 3 PbI 3– x Cl x perovskite layer are observed by the d I/ d V mapping and point spectra. A power law dependence of the d I/ d V point spectra is revealed. In addition, the distinct electronic phases are found to have preferential orientations close to the normal direction of the film surface. Density functional theory calculations indicate that the observed electronic phases are associated with local deviation of I/Cl ratio, rather than different orientations of the electric dipole moments in the ferroelectric phases. By comparing the calculated results with experimental data we conclude that phase A (lower contrast in d I/ d V mapping at −2.0 V bias) contains a lower I/Cl ratio than that in phase B (higher contrast in d I/ d V ).
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Solid-state spectroscopy and crystallography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071, United States
Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
Funding
Basic Energy Sciences · Division of Graduate Education · School of Energy Resources, University of Wyoming · Ministry of Science and Technology, Taiwan
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