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Thursday 15th June 2023 at 11:00, IF 1st wing, big lecture hall <br>
<span style="color: #55913c; font-family: times new roman, new
york, times, serif;"><span style="font-size: 21.3333px;"
data-mce-style="font-size: 21.3333px;"></span></span><span
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data-mce-style="font-size: 21.3333px;"></span></span><span
style="color: #55913c; font-family: times new roman, new york,
times, serif;"><span style="font-size: 21.3333px;"
data-mce-style="font-size: 21.3333px;"><b><b
style="mso-bidi-font-weight:normal"><span
style="font-size:16.0pt;mso-bidi-font-size:11.0pt;line-height:107%;
font-family:"Calibri",sans-serif;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:
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mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA"
lang="EN-GB">Microscopic investigation of intrinsic
defects in transition metal dichalcogenide monolayers
grown by chemical vapour deposition</span></b></b></span></span>
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new york, times, serif;"><span style="font-size: 21.3333px;"
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<div><b style="color: #000000; font-family: arial, helvetica,
sans-serif; font-size: 18.6667px;" data-mce-style="color:
#000000; font-family: arial, helvetica, sans-serif; font-size:
18.6667px;">mag. phys. Ana Senkić</b><br>
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<div><span style="font-family: sans-serif;"><span
style="font-size: 14.6667px;" data-mce-style="font-size:
14.6667px;"><b>Institue of Physics, Zagreb<br>
</b></span></span></div>
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<p class="MsoNoSpacing" style="text-align:justify"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Transition
metal dichalcogenides (TMDs) present a broad family of
two-dimensional (2D) materials with properties ranging from
insulators to superconductors. With the general formula of
MX<sub>2</sub>, the monolayer (1L) material consists of one
plane of transition metal atoms M which is sandwiched
between two planes of chalcogen atoms X. The most
investigated TMD material is molybdenum disulfide – MoS<sub>2</sub>.
This semiconductor has a bandgap in the visible spectrum,
making it a promising candidate for application in
photovoltaics, solar cells, optoelectronics, field effect
transistors [1-3]. Due to its 2D nature, MoS<sub>2</sub> is
extremely susceptible to the environment: humidity,
temperature, exposure to atmosphere [4]. For these reasons,
the synthesis of high-quality monocrystals with
non-deteriorating properties, is of great importance.
Optimum synthesis conditions yield high-quality crystalline
structure, which then in turn, leads to great properties –
such as optical and electronic.</span></p>
<p class="MsoNoSpacing" style="text-align:justify"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">In the first
part of my seminar I will discuss how different synthesis
parameters influence the morphology and optical properties
of MoS<sub>2</sub> samples [6]. In the second part, I will
present the results of a detailed study on two different MoS<sub>2</sub>
samples, synthesized under different growth temperatures, in
order to understand the correlation between growth
temperature and defects’ nature of the samples [6]. The
influence of defects on optical and electronic properties is
investigated with low-temperature photoluminescence
measurements, room-temperature transient absorption
microscopy, and Kelvin Probe Force Microscopy. In the final
part of my talk, I will discuss how defects can be utilised
in order to produce new properties in a host material via
alloying and how apparently identical growth conditions can
lead to different crystal structures.</span></p>
<p class="MsoNoSpacing" style="text-align:justify"><b
style="mso-bidi-font-weight: normal"><span
style="font-size:12.0pt;mso-bidi-font-size:11.0pt;
mso-ansi-language:EN-GB" lang="EN-GB">REFERENCES</span></b></p>
<br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[1] J. S.
Ross et al., Electrically tunable excitonic light-emitting
diodes based on monolayer WSe2 p–n junctions, Nat Nanotechnol,
vol. 9, no. 4, pp. 268–272, Apr. 2014.</span><br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[2] R. S.
Sundaram et al., Electroluminescence in Single Layer MoS2,
Nano Lett, vol. 13, no. 4, pp. 1416–1421, Apr. 2013.</span><br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[3] B. W. H.
Baugher, H. O. H. Churchill, Y. Yang, and P. Jarillo-Herrero,
Optoelectronic devices based on electrically tunable p–n
diodes in a monolayer dichalcogenide, Nat Nanotechnol, vol. 9,
no. 4, pp. 262–267, Apr. 2014.</span><br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[4] X. Wang
et al., Defect Heterogeneity in Monolayer WS2 Unveiled by Work
Function Variance, Chemistry of Materials, vol. 31, no. 19,
pp. 7970–7978, Oct. 2019.</span><br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[5] A.
Senkić, J. Bajo et al. Effects of CVD growth parameters on
global and local optical properties of MoS2 monolayers,
Materials Chemistry and Physics 296 (2023) 127185.</span><br>
<span style="mso-ansi-language:EN-GB" lang="EN-GB">[6] A. Senkić
et al. Microscopic Investigation of Intrinsic Defects in CVD
Grown MoS2 Monolayers, IoP Nanotechnology, in review.</span>
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<div align="justify"><strong>LOCATION:</strong> <span> </span><strong
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Physics, 1st wing, big lecture hall + online<br>
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