Abstract
Two-dimensional transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here a controllable CVD process is developed for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene–WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid, and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2–sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities.
| Original language | English |
|---|---|
| Article number | 1701347 |
| Number of pages | 9 |
| Journal | Advanced Optical Materials |
| Volume | 6 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 19 Jun 2018 |
Keywords
- biexcitons
- chemical vapor deposition
- dielectric screening
- photoluminescence
- transition metal dichalcogenides
Cite this
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Reliable Synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation. / Zhang, Qianhui; Lu, Jianfeng; Wang, Ziyu; Dai, Zhigao; Zhang, Yupeng; Huang, Fuzhi; Bao, Qiaoliang; Duan, Wenhui; Fuhrer, Michael S.; Zheng, Changxi.
In: Advanced Optical Materials, Vol. 6, No. 12, 1701347, 19.06.2018.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Reliable Synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation
AU - Zhang, Qianhui
AU - Lu, Jianfeng
AU - Wang, Ziyu
AU - Dai, Zhigao
AU - Zhang, Yupeng
AU - Huang, Fuzhi
AU - Bao, Qiaoliang
AU - Duan, Wenhui
AU - Fuhrer, Michael S.
AU - Zheng, Changxi
PY - 2018/6/19
Y1 - 2018/6/19
N2 - Two-dimensional transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here a controllable CVD process is developed for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene–WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid, and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2–sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities.
AB - Two-dimensional transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here a controllable CVD process is developed for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene–WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid, and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2–sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities.
KW - biexcitons
KW - chemical vapor deposition
KW - dielectric screening
KW - photoluminescence
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85044200476&partnerID=8YFLogxK
U2 - 10.1002/adom.201701347
DO - 10.1002/adom.201701347
M3 - Article
VL - 6
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 12
M1 - 1701347
ER -