期刊
ACS NANO
卷 13, 期 11, 页码 12372-12384出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04957
关键词
transition-metal dichalcogenides; two-dimensional materials; heterostructures; Raman spectroscopy; photovoltaic; electroluminescence; optoelectronics
类别
资金
- National Science Foundation [DMR-1807969, DMR-1557434]
- Army Research Office through MURI award [W911NF-11-1-0362]
- Office of Naval Research through DUMP grant [11997003]
- NSF [DMR-1644779]
- State of Florida
Two-dimensional lateral heterojunctions based on monolayer transition-metal dichalcogenides (TMDs) have received increasing attention given that their direct band gap makes them very attractive for optoelectronic applications. Although bilayer TMDs present an indirect band gap, their electrical properties are expected to be less susceptible to ambient conditions, with higher mobilities and density of states when compared to monolayers. Bilayers and few-layers single domain devices have already demonstrated higher performance in radio frequency and photosensing applications. Despite these advantages, lateral heterostructures based on bilayer domains have been less explored. Here, we report the controlled synthesis of multi-junction bilayer lateral heterostructures based on MoS2-WS2 and MoSe2-WSe2 monodomains. The heterojunctions are created via sequential lateral edge-epitaxy that happens simultaneously in both the first and the second layers. A phenomenological mechanism is proposed to explain the growth mode with self-limited thickness that happens within a certain window of growth conditions. With respect to their as-grown monolayer counterparts, bilayer lateral heterostructures yield nearly 1 order of magnitude higher rectification currents. They also display a clear photovoltaic response, with short circuit currents 103 times larger than those extracted from the as-grown monolayers, in addition to room-temperature electroluminescence. The improved performance of bilayer heterostructures significantly expands the potential of two-dimensional materials for optoelectronics.
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