Cho, Kyungjune Pak, Jinsu Kim, Jae-Keun Kang, Keehoon Kim, Tae-Young Shin, Jiwon Choi, Barbara Yuri Chung, Seungjun Lee, Takhee 2024-01-19T22:34:39Z 2024-01-19T22:34:39Z 2021-09-03 2018-05-03 0935-9648 https://pubs.kist.re.kr/handle/201004/121384 Although 2D molybdenum disulfide (MoS2) has gained much attention due to its unique electrical and optical properties, the limited electrical contact to 2D semiconductors still impedes the realization of high-performance 2D MoS2-based devices. In this regard, many studies have been conducted to improve the carrier-injection properties by inserting functional paths, such as graphene or hexagonal boron nitride, between the electrodes and 2D semiconductors. The reported strategies, however, require relatively time-consuming and low-yield transfer processes on sub-micrometer MoS2 flakes. Here, a simple contact-engineering method is suggested, introducing chemically adsorbed thiol-molecules as thin tunneling barriers between the metal electrodes and MoS2 channels. The selectively deposited thiol-molecules via the vapor-deposition process provide additional tunneling paths at the contact regions, improving the carrier-injection properties with lower activation energies in MoS2 field-effect transistors. Additionally, by inserting thiol-molecules at the only one contact region, asymmetric carrier-injection is feasible depending on the temperature and gate bias. English WILEY-V C H VERLAG GMBH MONOLAYER MOS2 SULFUR VACANCIES LAYER MOS2 MOS2(0001) ADSORPTION BN Contact-Engineered Electrical Properties of MoS2 Field-Effect Transistors via Selectively Deposited Thiol-Molecules Article 10.1002/adma.201705540 1 ADVANCED MATERIALS, v.30, no.18 ADVANCED MATERIALS 30 18 scie scopus 000431615100004 2-s2.0-85044294710 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article MONOLAYER MOS2 SULFUR VACANCIES LAYER MOS2 MOS2(0001) ADSORPTION BN charge injection contact engineering electrical transport MoS2 thiol-molecules