High carrier mobility epitaxially aligned PtSe2 films grown by one-zone selenization

Sojková, M.; Dobročka, Edmund; Hutár, Peter; Tašková, Valéria; Slušná, Lenka Príbusová; Stoklas, R.; Píš, Igor; Bondino, Federica; Munnik, Frans; Hulman, Martin

doi:10.1016/j.apsusc.2020.147936

Cited by 16 publications

(19 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The former is in the 10–100 μS range for the two PtSe 2 samples. This result reasonably agrees with the DC sheet conductance of ∼10–130 μS reported in refs ( 23 , 28 , 29 ) for selenized layers of a similar thickness.…”

Section: Resultssupporting

confidence: 92%

“…The thickness of the PtSe 2 layers was determined by measuring the layers′ X-ray reflectivity (XRR). 23 The shape of an interference pattern of the X-ray beams reflected from the upper and bottom surfaces of the layer depends sensitively on the layer thickness. The fits to the XRR patterns gave thicknesses of 1.8 and 1.9 nm with a roughness of 0.3 nm for both samples.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

et al. 2021

Self Cite

View full text Add to dashboard Cite

Thin films of transition-metal dichalcogenides are potential materials for optoelectronic applications. However, the application of these materials in practice requires knowledge of their fundamental optical properties. Many existing methods determine optical constants using predefined models. Here, a different approach was used. We determine the sheet conductance and absorption coefficient of few-layer PtSe 2 in the infrared and UV–vis ranges without recourse to any particular model for the optical constants. PtSe 2 samples with a thickness of about 3–4 layers were prepared by selenization of 0.5 nm thick platinum films on sapphire substrates at different temperatures. Differential reflectance was extracted from transmittance and reflectance measurements from the front and back of the sample. The film thickness, limited to a few atomic layers, allowed a thin-film approximation to calculate the optical conductance and absorption coefficient. The former has a very different energy dependence in the infrared, near-infrared, and visible ranges. The absorption coefficient exhibits a strong power-law dependence on energy with an exponent larger than three in the mid-infrared and near-infrared regions. We have not observed any evidence for a band gap in PtSe 2 thin layers down to an energy of 0.4 eV from our optical measurements.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…1(b)) using DIFFRAC.LEPTOS soware. 22 All the lms have a similar thickness (4 AE 0.5 nm) corresponding to 8 AE 1 monolayers of PtSe 2 . 28 Azimuthal (4-scan) measurements of 101 diffraction of PtSe 2 and 104 diffraction of sapphire revealed the in-plane crystallographic orientation of the lms (Fig.…”

Section: Resultsmentioning

confidence: 99%

Tuning the charge carrier mobility in few-layer PtSe₂films by Se : Pt ratio

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The synthesized PtSe2 was confirmed to have a layered 2D structure via Raman spectroscopy, with the A1g (out-of-plane vibration) and Eg (in-plane vibration) peaks at 208.5 and 180 cm −1 , respectively (Figure S1c) [44,45]. The 2D PtSe2 indicated 2.67 cm 2 /Vs mobility, which is lower than reported value due to a fine structure with a lot of grain boundaries [46,47]. The thickness of the 2D PtSe2 was 4.08 nm and the optical band gap was 0.88 eV, which are in agreement with the values reported in the literature for four layer PtSe2 (Figure S1d,e) [20,48].…”

Section: Resultsmentioning

confidence: 78%

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

et al. 2021

View full text Add to dashboard Cite

Compact and highly sensitive near-infrared photodetectors that are operable at room temperature are required for light detection and ranging and medical devices. Two-dimensional (2D) PtSe2, a transition metal dichalcogenide, is a candidate material for near-infrared light detection. However, the photoresponse properties of 2D PtSe2 are currently inferior to those of commercial materials. The localized surface plasmon resonance of Au has been widely used for photoelectric field enhancement and in photochemical reactions associated with phase relaxation from plasmon states that occur at specific wavelengths. Spherical Au nanocolloids exhibit an extinction peak in the visible light region, whereas nanorods can be tuned to exhibit the extinction peak in the near-infrared region by controlling their aspect ratio. In this study, hybrid Au nanorod/2D PtSe2 structure was fabricated via spin coating nanorods, with plasmon peaks in the near-infrared region, on 2D PtSe2. Furthermore, the effect of the concentration of the nanorod solution on the photoresponse of nanorod/2D PtSe2 was investigated. The photocurrent of 5 nM Au nanorod-coated 2D PtSe2 was fivefold higher than that of bare 2D PtSe2. The responsivity was maximum 908 μW/A at 0.5 V bias voltage. In addition, the photocurrent enhancement mechanism by Au nanorods is discussed.

show abstract

High carrier mobility epitaxially aligned PtSe2 films grown by one-zone selenization

Cited by 16 publications

References 38 publications

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

Tuning the charge carrier mobility in few-layer PtSe₂films by Se : Pt ratio

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

Contact Info

Product

Resources

About

High carrier mobility epitaxially aligned PtSe2 films grown by one-zone selenization

Cited by 16 publications

References 38 publications

Optical Characterization of Few-Layer PtSe2 Nanosheet Films

Optical Characterization of Few-Layer PtSe2 Nanosheet Films

Tuning the charge carrier mobility in few-layer PtSe2films by Se : Pt ratio

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

Contact Info

Product

Resources

About

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

Optical Characterization of Few-Layer PtSe₂ Nanosheet Films

Tuning the charge carrier mobility in few-layer PtSe₂films by Se : Pt ratio