[seminar] seminar @IF+online Thursday, 15.6.2023. at 11:00 - mag. phys. Ana Senkić
Damir Dominko
ddominko at ifs.hr
Mon Jun 5 11:40:41 CEST 2023
Thursday 15th June 2023 at 11:00, IF 1st wing, big lecture hall
**Microscopic investigation of intrinsic defects in transition metal
dichalcogenide monolayers grown by chemical vapour deposition**
*mag. phys. Ana Senkić*
*Institue of Physics, Zagreb
*
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_2 , 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_2 . 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_2 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.
In the first part of my seminar I will discuss how different synthesis
parameters influence the morphology and optical properties of MoS_2
samples [6]. In the second part, I will present the results of a
detailed study on two different MoS_2 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.
*REFERENCES*
[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.
[2] R. S. Sundaram et al., Electroluminescence in Single Layer MoS2,
Nano Lett, vol. 13, no. 4, pp. 1416–1421, Apr. 2013.
[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.
[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.
[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.
[6] A. Senkić et al. Microscopic Investigation of Intrinsic Defects in
CVD Grown MoS2 Monolayers, IoP Nanotechnology, in review.
*LOCATION:* *Institute of Physics, 1st wing, big lecture hall + online
*
*Seminar**hosts**: Neven Šantić <mailto:nsantic at ifs.hr> and _Damir
Dominko <mailto:ddominko at ifs.hr>
Join Zoom Meeting
https://us06web.zoom.us/j/87061512305?pwd=QjcvSWxEOWZoMmxGdGpsVVZnZUxyZz09
Meeting ID: 870 6151 2305
Passcode: 144767
_*
--
Damir Dominko
Research associate
Institute of Physics Zagreb
Bijenicka cesta 46, 02-226
10000 Zagreb, Croatia
office: +385 1 469 8821
cell: +385958172990
e-mail:ddominko at ifs.hr
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