Journal
SMALL
Volume 11, Issue 40, Pages 5430-5438Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201501206
Keywords
photovoltaics; self-driven photoswitching; tunable polarity; photoswitching; WSe2; WS2 heterojunctions
Categories
Funding
- National Natural Science Foundation of China [91233120]
- National Basic Research Program of China [2011CB921901]
- U.S. Department of Energy [DE-AC36-08GO28308]
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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 WSe2/WS2 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 WSe2/WS2 heterojunctions owing to the successive work of conducting channels of junctions, p-WSe2 and n-WS2 on the electrical transport of the whole systems. The type-II band alignment 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.
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