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Sharbirin AS, Kong RE, Mato WB et al. Highly enhanced UV absorption and light emission of monolayer WS2 through hybridization with Ti2N MXene quantum dots and g-C3N4 quantum dots. Opto-Electron Adv 7, 240029 (2024). doi: 10.29026/oea.2024.240029
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Article Open Access
Highly enhanced UV absorption and light emission of monolayer WS2 through hybridization with Ti2N MXene quantum dots and g-C3N4 quantum dots
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Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMD) are atomically thin semiconductors with promising optoelectronic applications across the visible spectrum. However, their intrinsically weak light absorption and the low photoluminescence quantum yield (PLQY) restrict their performance and potential use, especially in ultraviolet (UV) wavelength light ranges. Quantum dots (QD) derived from 2D materials (2D/QD) provide efficient light absorption and emission of which energy can be tuned for desirable light wavelength. In this study, we greatly enhanced the photon absorption and PLQY of monolayer (1L) tungsten disulfide (WS2) in the UV range via hybridization with 2D/QD, particularly titanium nitride MXene QD (Ti2N MQD) and graphitic carbon nitride QD (GCNQD). With the hybridization of MQD or GCNQD, 1L-WS2 showed a maximum PL enhancement by 15 times with 300 nm wavelength excitation, while no noticeable enhancement was observed when the excitation photon energy was less than the bandgap of the QD, indicating that UV absorption by the QD played a crucial role in enhancing the light emission of 1L-WS2 in our 0D/2D hybrid system. Our findings present a convenient method for enhancing the photo-response of 1L-WS2 to UV light and offer exciting possibilities for harvesting UV energy using 1L-TMD.-
Keywords:
- monolayer TMD /
- WS2 /
- 2D-derived quantum dots /
- UV absorption /
- energy transfer
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References
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Supplementary information for Highly enhanced UV absorption and light emission of monolayer WS2 through hybridization with Ti2N MXene quantum dots and g-C3N4 quantum dots 
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Sharbirin AS, Kong RE, Mato WB et al. Highly enhanced UV absorption and light emission of monolayer WS2 through hybridization with Ti2N MXene quantum dots and g-C3N4 quantum dots. Opto-Electron Adv 7, 240029 (2024). doi: 10.29026/oea.2024.240029
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Figure 1.
(a) Schematic diagram illustrating the hybrid structure of 2D/QD and 1L-WS2. (b) Optical image and (c, d) Confocal PL mapping images of the 1L-WS2 and 1L-WS2/MQD hybrid obtained with
$ {\text{λ} }_{\text{ex}}= $ $ {\text{nm}} $ $ {\text{λ} }_{\text{ex}}= $ $ {\text{nm}} $ $ {\text{μm}} $ $ {\text{λ} }_{\text{ex}}= $ $ {\text{nm}} $ $ {\text{λ} }_{\text{ex}}= $ $ {\text{nm}} $ -
Figure 2.
(a) Optical microscope image and (b) Epi-fluorescence image of 1L-WS2/MQD hybrid under λex=300 nm UV illumination (orange dotted lines in A indicates the boundary of MQD region and clean region without MQD). Scale bar is 2 μm. (c) Representative PL spectra of 1L-WS2/MQD hybrid (red curve) and 1L-WS2 (blue curve) showing a 15-fold enhancement in PL.
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Figure 3.
(a, b) Confocal PL mapping images of 1L-WS2/GCNQD hybrid with
$ {\lambda }_{\rm{ex}} $ $ \;{\rm{nm}} $ $ \;{\rm{nm}} $ -
Figure 4.
Measured micro absorption spectra of 1L-WS2/GCNQD (black curve), 1L-WS2/MQD (blue curve) and 1L-WS2 only (red curve) as a function of photon wavelength. Six discrete data points are measured absorptions of 1L-WS2/GCNQD (black), 1L-WS2/MQD (blue) and 1L-WS2 only (red) measured by using laser sources at 300 nm and 375 nm wavelengths. Dashed lines are guides for the eyes.
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Figure 5.
PL spectra obtained from (a) MQD and (b) GCNQD in hybrid of 1L-WS2/QD. (c) Time-resolved photoluminescence (TRPL) of MQD emission of isolated MQD (blue curve) and 1L-WS2/MQD hybrid (orange curve). (d) TRPL of GCNQD emission of isolated GCNQD (green curve) and 1L-WS2/GCNQD hybrid (purple curve) at λex=375 nm. Dotted line represents the fitting curve. The emission of (c) and (d) was collected at the wavelength range of 400-550 nm using the combination of a long-pass filter and a short-pass filter to exclude the emission of 1L-WS2. (e) Schematic of energy band alignment showing the type I band alignment of hybrid structure between QD and 1L-WS2. Values of the conduction band minimum (ECBM) and the valence band maximum (EVBM) and the Fermi level (EF) for each material are marked.
