Ultrafast Interlayer Charge Transfer between Bilayer PtSe2 and Monolayer WS2

Wang, Pengzhi; He, Dawei; Wang, Yongsheng; Zhang, Xiaoxian; He, Xiaoyue; He, Jiaqi; Zhao, Hui

doi:10.1021/acsami.1c18189

Title: Ultrafast Interlayer Charge Transfer between Bilayer PtSe₂ and Monolayer WS₂

Journal Article · Fri Nov 19 00:00:00 EST 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c18189· OSTI ID:1864724

^[1]; He, Dawei ^[1]; Wang, Yongsheng ^[1];

^[1]; He, Xiaoyue ^[2]; He, Jiaqi ^[3];

^[4]

Beijing Jiaotong Univ. (China)
Songshan Lake Materials Lab., Guangdong (China)
Beijing Univ. of Chemical Technology (China)
Univ. of Kansas, Lawrence, KS (United States)

Interlayer charge transfer (CT) between PtSe₂ and WS₂ is studied experimentally. Layer-selective pump–probe and photoluminescence quenching measurements reveal ultrafast interlayer CT in the heterostructure formed by bilayer PtSe₂ and monolayer WS₂, confirming its type-II band alignment. The CT facilitates the formation of the interlayer excitons with a lifetime of several hundred ps to 1 ns, a diffusion coefficient of 0.9 cm² s^–1, and a diffusion length reaching 200 nm. Furthermore, these results demonstrate the integration of PtSe₂ with other materials in van der Waals heterostructures with novel charge-transfer properties and help develop fundamental understanding on the performance of various optoelectronic devices based on heterostructures involving PtSe₂.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0020995

OSTI ID:: 1864724

Journal Information:: ACS Applied Materials and Interfaces, Vol. 13, Issue 48; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Ultrafast Interlayer Charge Transfer between Bilayer PtSe2 and Monolayer WS2

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Title: Ultrafast Interlayer Charge Transfer between Bilayer PtSe₂ and Monolayer WS₂