期刊
ADVANCED FUNCTIONAL MATERIALS
卷 27, 期 45, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201703688
关键词
block copolymers; MoS2; nanopatterning; photoluminescence; transition metal dichalcogenides
类别
资金
- Sir Dorabji Tata Trust
- Allied Trusts
- C-SPIN, a STARnet Center of MARCO
- DARPA
- National Science Foundation (NSF) Center for Energy Efficient Electronics Science (E3S) Award [ECCS-0939514]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Royal Society
Monolayer 2D MoS2 grown by chemical vapor deposition is nanopatterned into nanodots, nanorods, and hexagonal nanomesh using block copolymer (BCP) lithography. The detailed atomic structure and nanoscale geometry of the nanopatterned MoS2 show features down to 4 nm with nonfaceted etching profiles defined by the BCP mask. Atomic resolution annular dark field scanning transmission electron microscopy reveals the nanopatterned MoS2 has minimal large-scale crystalline defects and enables the edge density to be measured for each nanoscale pattern geometry. Photoluminescence spectroscopy of nanodots, nanorods, and nanomesh areas shows strain-dependent spectral shifts up to 15 nm, as well as reduction in the PL efficiency as the edge density increases. Raman spectroscopy shows mode stiffening, confirming the release of strain when it is nanopatterned by BCP lithography. These results show that small nanodots (approximate to 19 nm) of MoS2 2D monolayers still exhibit strong direct band gap photoluminescence (PL), but have PL quenching compared to pristine material from the edge states. This information provides important insights into the structure-PL property correlations of sub-20 nm MoS2 structures that have potential in future applications of 2D electronics, optoelectronics, and photonics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据