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Morphological Control of 2D Hybrid Organic-Inorganic Semiconductor AgSePh

Authors
Paritmongkol, WatcharapholLee, Woo SeokShcherbakov-Wu, WenbiHa, Seung KyunSakurada, TomoakiOh, Soong JuTisdale, William A.
Issue Date
22-2월-2022
Publisher
AMER CHEMICAL SOC
Keywords
two-dimensional; optical properties; hybrid semiconductors; synthesis; metal organic chalcogenolates; photodetectors; defects
Citation
ACS NANO, v.16, no.2, pp.2054 - 2065
Indexed
SCIE
SCOPUS
Journal Title
ACS NANO
Volume
16
Number
2
Start Page
2054
End Page
2065
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/143133
DOI
10.1021/acsnano.1c07498
ISSN
1936-0851
Abstract
Silver phenylselenolate (AgSePh) is a hybrid organic- inorganic two-dimensional (2D) semiconductor exhibiting narrow blue emission, in-plane anisotropy, and large exciton binding energy. Here, we show that the addition of carefully chosen solvent vapors during the chemical transformation of metallic silver to AgSePh allows for control over the size and orientation of AgSePh crystals. By testing 28 solvent vapors (with different polarities, boiling points, and functional groups), we controlled the resulting crystal size from <200 nm up to a few mu m. Furthermore, choice of solvent vapor can substantially improve the orientational homogeneity of 2D crystals with respect to the substrate. In particular, solvents known to form complexes with silver ions, such as dimethyl sulfoxide (DMSO), led to the largest lateral crystal dimensions and parallel crystal orientation. We perform systematic optical and electrical characterizations on DMSO vapor-grown AgSePh films demonstrating improved crystalline quality, lower defect densities, higher photoconductivity, lower dark conductivity, suppression of ionic migration, and reduced midgap photoluminescence at low temperature. Overall, this work provides a strategy for realizing AgSePh films with improved optical properties and reveals the roles of solvent vapors on the chemical transformation of metallic silver.
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공과대학 (신소재공학부)
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