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Ultrafast Interlayer Charge Transfer between Bilayer PtSe2 and Monolayer WS2

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Beijing Jiaotong Univ. (China); The University of Kansas
  2. Beijing Jiaotong Univ. (China)
  3. Songshan Lake Materials Lab., Guangdong (China)
  4. Beijing Univ. of Chemical Technology (China)
  5. 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.
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, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 48 Vol. 13; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)