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Surface Termination...
Surface Termination-Dependent Nanotribological Properties of Single-Crystal MAPbBr(3) Surfaces
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- Choi, Joong Il Jake (author)
- Institute for Basic Science, KOR
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- Khan, Muhammad Ejaz (author)
- KAIST, KOR;National University of Technology, PAK
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- Hawash, Zafer (author)
- Okinawa Institute of Science and Technology, JPN
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- Lee, Hyunhwa (author)
- Institute for Basic Science, KOR; KAIST, KOR
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- Ono, Luis K. (author)
- Okinawa Institute of Science and Technology, JPN
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- Qi, Yabing (author)
- Okinawa Institute of Science and Technology Graduate University, JPN
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- Kim, Yong-Hoon (author)
- KAIST, KOR
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- Park, Jeong Young (author)
- Institute for Basic Science, KOR
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(creator_code:org_t)
- 2019-12-17
- 2020
- English.
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In: The Journal of Physical Chemistry C. - : AMER CHEMICAL SOC. - 1932-7447 .- 1932-7455. ; 124:2, s. 1484-1491
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Atomistic characterization of surface termination and the corresponding mechanical properties of single-crystal methylammonium lead tribromide (MAPbBr(3)) are performed using combined atomic force microscopy (AFM) measurements and density functional theory (DFT) calculations. A clean MAPbBr(3) surface is obtained by in situ cleavage in ultrahigh vacuum at room temperature, and the subsequent AFM measurements of the as-cleaved MAPbBr(3) exhibit the coexistence of two different surface terrace types with step height differences corresponding to about half the thickness of a PbI6 octahedron layer. Concurrent friction force microscopy measurements show that the two surfaces result in two distinct friction values. Based on DFT calculations, we attribute the higher-friction and lower-friction surfaces to MABr-terminated flat and PbBr2-terminated vacant surface terminations, respectively. The calculated electronic band structures of the various MABr- and PbBr2-terminated surfaces show that the midgap states are absent, revealing the defect-tolerant nature of the ideal single-crystal MAPbBr(3) surfaces.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Materialteknik
- Materials Engineering
Publication and Content Type
- ref (subject category)
- art (subject category)
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