Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer
Interfacial bubbles are unintentionally created during the transfer of atomically thin 2D layers, a required process in the fabrication of van der Waals heterostructures. By encapsulating a WSe<sub>2</sub> monolayer in hBN, we study the differing photoluminescence (PL) properties of the...
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MDPI AG
2020-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/2/350 |
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doaj-d8f49bfd53464ec7b99f0187810d759d2020-11-25T02:19:16ZengMDPI AGNanomaterials2079-49912020-02-0110235010.3390/nano10020350nano10020350Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> MonolayerSeong-Yeon Lee0Tae-Young Jeong1Seonghun Ahn2Suyong Jung3Yong-Hoon Cho4Ki-Ju Yee5Department of Physics, Chungnam National University, Daejeon 34134, KoreaDepartment of Physics, Chungnam National University, Daejeon 34134, KoreaDepartment of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, KoreaKorea Research Institute of Standards and Science, Daejeon 34113, KoreaDepartment of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, KoreaDepartment of Physics, Chungnam National University, Daejeon 34134, KoreaInterfacial bubbles are unintentionally created during the transfer of atomically thin 2D layers, a required process in the fabrication of van der Waals heterostructures. By encapsulating a WSe<sub>2</sub> monolayer in hBN, we study the differing photoluminescence (PL) properties of the structure resulting from bubble formation. Based on the differentiated absorption probabilities at the bubbles compared to the pristine areas, we demonstrate that the visibility of the bubbles in PL mapping is enhanced when the photoexcitation wavelength lies between the n = 1 and n = 2 resonances of the A-exciton. An appropriate choice of detection window, which includes localized exciton emission but excludes free exciton emission, further improves bubble imaging capability. The interfacial position dependence of the bubbles, whether they are located above or below the WSe<sub>2</sub> monolayer, gives rise to measurable consequences in the PL shape.https://www.mdpi.com/2079-4991/10/2/3502d materialshbn-encapsulated wse<sub>2</sub> monolayerphotoluminescence mappingphotoluminescence excitation spectroscopy |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Seong-Yeon Lee Tae-Young Jeong Seonghun Ahn Suyong Jung Yong-Hoon Cho Ki-Ju Yee |
| spellingShingle |
Seong-Yeon Lee Tae-Young Jeong Seonghun Ahn Suyong Jung Yong-Hoon Cho Ki-Ju Yee Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer Nanomaterials 2d materials hbn-encapsulated wse<sub>2</sub> monolayer photoluminescence mapping photoluminescence excitation spectroscopy |
| author_facet |
Seong-Yeon Lee Tae-Young Jeong Seonghun Ahn Suyong Jung Yong-Hoon Cho Ki-Ju Yee |
| author_sort |
Seong-Yeon Lee |
| title |
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer |
| title_short |
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer |
| title_full |
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer |
| title_fullStr |
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer |
| title_full_unstemmed |
Effective Photoluminescence Imaging of Bubbles in hBN-Encapsulated WSe<sub>2</sub> Monolayer |
| title_sort |
effective photoluminescence imaging of bubbles in hbn-encapsulated wse<sub>2</sub> monolayer |
| publisher |
MDPI AG |
| series |
Nanomaterials |
| issn |
2079-4991 |
| publishDate |
2020-02-01 |
| description |
Interfacial bubbles are unintentionally created during the transfer of atomically thin 2D layers, a required process in the fabrication of van der Waals heterostructures. By encapsulating a WSe<sub>2</sub> monolayer in hBN, we study the differing photoluminescence (PL) properties of the structure resulting from bubble formation. Based on the differentiated absorption probabilities at the bubbles compared to the pristine areas, we demonstrate that the visibility of the bubbles in PL mapping is enhanced when the photoexcitation wavelength lies between the n = 1 and n = 2 resonances of the A-exciton. An appropriate choice of detection window, which includes localized exciton emission but excludes free exciton emission, further improves bubble imaging capability. The interfacial position dependence of the bubbles, whether they are located above or below the WSe<sub>2</sub> monolayer, gives rise to measurable consequences in the PL shape. |
| topic |
2d materials hbn-encapsulated wse<sub>2</sub> monolayer photoluminescence mapping photoluminescence excitation spectroscopy |
| url |
https://www.mdpi.com/2079-4991/10/2/350 |
| work_keys_str_mv |
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