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Orientation-Dependent Conversion of VLS-Grown Lead Iodide Nanowires into Organic-Inorganic Hybrid Perovskites

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Abstract
In this study, we demonstrate Sn-assisted vapor-liquid-solid (VLS) growth of lead iodide (PbI2) nanowires with van der Waals layered crystal structure and subsequent vapor-phase conversion into methylammonium lead iodide (CH3NH3PbI3) perovskites. Our systematic microscopic investigations confirmed that the VLS-grown PbI2 nanowires display two major growth orientations of [0001] and [1210], corresponding to the stacking configurations of PbI2 layers to the nanowire axis (transverse for [0001] vs. parallel for [1210]). The resulting difference in the sidewall morphologies was correlated with the perovskite conversion, where [0001] nanowires showed strong localized conversion at top and bottom, as opposed to [1210] nanowires with an evenly distributed degree of conversion. An ab initio energy calculation suggests that CH3NH3I preferentially diffuses and intercalates into (1120) sidewall facets parallel to the [1210] nanowire axis. Our results underscore the ability to control the crystal structures of van der Waals type PbI2 in nanowire via the VLS technique, which is critical for the subsequent conversion process into perovskite nanostructures and corresponding properties.
Author(s)
심혜원황윤정강성구신내철
Issued Date
2021
Type
Article
Keyword
PbI2nanowiresvapor-liquid-solidorientationCH3NH3PbI3perovskites
DOI
10.3390/nano11010223
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9222
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_doaj_primary_oai_doaj_org_article_9f7b9554760542ee8f5e63ef0074fdfc&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Orientation-Dependent%20Conversion%20of%20VLS-Grown%20Lead%20Iodide%20Nanowires%20into%20Organic-Inorganic%20Hybrid%20Perovskites&offset=0&pcAvailability=true
Publisher
NANOMATERIALS
Location
스위스
Language
영어
ISSN
2079-4991
Citation Volume
11
Citation Number
1
Citation Start Page
223
Citation End Page
223
Appears in Collections:
Engineering > Chemical Engineering
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