Coexistence of two electronic nano-phases on a CH3NH3PbI3–xClx surface observed in STM measurements

Yost, Andrew J.; Pimachev, Artem; Ho, Chun -Chih; Darling, Seth B.; Wang, Leeyih; Su, Wei -Fang; Dahnovsky, Yuri; Chien, TeYu

doi:10.1021/acsami.6b07721

Title: Coexistence of two electronic nano-phases on a CH₃NH₃PbI_3–xCl_x surface observed in STM measurements

Journal Article · Mon Oct 10 00:00:00 EDT 2016 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.6b07721· OSTI ID:1349662

Yost, Andrew J. ^[1]; Pimachev, Artem ^[1]; Ho, Chun -Chih ^[2]; Darling, Seth B. ^[3]; Wang, Leeyih ^[4]; Su, Wei -Fang ^[4]; Dahnovsky, Yuri ^[1]; Chien, TeYu ^[1]

Univ. of Wyoming, Laramie, WY (United States)
National Taiwan Univ., Taipei (Taiwan); Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, Chicago, IL (United States)
National Taiwan Univ., Taipei (Taiwan)

Scanning tunneling microscopy is utilized to investigate the local density of states of a CH₃NH₃PbI_3-xCl_x perovskite in cross-sectional geometry. Two electronic phases, 10-20 nm in size, with different electronic properties inside the CH₃NH₃PbI_3-xCl_x perovskite layer are observed by the dI/ dV mapping and point spectra. A power law dependence of the dI/dV 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. Furthermore, by comparing the calculated results with experimental data we conclude that phase A (lower contrast in dI/dV mapping at -2.0 V bias) contains a lower I/Cl ratio than that in phase B (higher contrast in dI/dV).

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1349662

Journal Information:: ACS Applied Materials and Interfaces, Vol. 8, Issue 42; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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organometallic halide perovskite
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Title: Coexistence of two electronic nano-phases on a CH3NH3PbI3–xClx surface observed in STM measurements

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Title: Coexistence of two electronic nano-phases on a CH₃NH₃PbI_3–xCl_x surface observed in STM measurements