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Poly(4-styrenesulfonate)-induced sulfur vacancy self-healing strategy for monolayer MoS2 homojunction photodiode.

Abstract：

:We establish a powerful poly(4-styrenesulfonate) (PSS)-treated strategy for sulfur vacancy healing in monolayer MoS2 to precisely and steadily tune its electronic state. The self-healing mechanism, in which the sulfur vacancies are healed spontaneously by the sulfur adatom clusters on the MoS2 surface through a PSS-induced hydrogenation process, is proposed and demonstrated systematically. The electron concentration of the self-healed MoS2 dramatically decreased by 643 times, leading to a work function enhancement of ∼150 meV. This strategy is employed to fabricate a high performance lateral monolayer MoS2 homojunction which presents a perfect rectifying behaviour, excellent photoresponsivity of ∼308 mA W-1 and outstanding air-stability after two months. Unlike previous chemical doping, the lattice defect-induced local fields are eliminated during the process of the sulfur vacancy self-healing to largely improve the homojunction performance. Our findings demonstrate a promising and facile strategy in 2D material electronic state modulation for the development of next-generation electronics and optoelectronics.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zhang X,Liao Q,Liu S,Kang Z,Zhang Z,Du J,Li F,Zhang S,Xiao J,Liu B,Ou Y,Liu X,Gu L,Zhang Y

doi

10.1038/ncomms15881

subject

Has Abstract

pub_date

2017-06-22 00:00:00

pages

15881

issn

2041-1723

pii

ncomms15881

journal_volume

8

pub_type

杂志文章

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