skip to main content

Title: Tunable Polarity Behavior and Self-Driven Photoswitching in p-WSe 2/n-WS 2 Heterojunctions

In Van der Waals (vdW) p–n heterojunctions consisting of various 2D layer compounds are fascinating new artificial materials that can possess novel physics and functionalities enabling the next-generation of electronics and optoelectronics devices. Here, it is reported that the WSe 2/WS 2 p–n heterojunctions perform novel electrical transport properties such as distinct rectifying, ambipolar, and hysteresis characteristics. Intriguingly, the novel tunable polarity transition along a route of n-“anti-bipolar”–p-ambipolar is observed in the WSe 2/WS 2 heterojunctions owing to the successive work of conducting channels of junctions, p-WSe 2 and n-WS 2 on the electrical transport of the whole systems. Moreover, the type-II band alignment we obtained from first principle calculations and built-in potential in this vdW heterojunction can also facilitate the efficient electron–hole separation, thus enabling the significant photovoltaic effect and a much enhanced self-driven photoswitching response in this system.
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1613-6810
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Small; Journal Volume: 11; Journal Issue: 40; Related Information: Small
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; photovoltaics; self-driven photoswitching; tunable polarity; photoswitching; WSe2/WS2 heterojunctions