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Molybdenum disulfide (MoS 2 ) is a representative two-dimensional layered transition-metal dichalcogenide semiconductor. Layer-number-dependent electronic properties are attractive in the development of nanomaterial-based electronics for a wide range of applications including sensors, switches, and amplifiers. MoS 2 field-effect transistors (FETs) have been studied as promising future nanoelectronic devices with desirable features of atomic-level thickness and high electrical properties. When a naturally n -doped MoS 2 is contacted with metals, a strong Fermi-level pinning effect adjusts a Schottky barrier and influences its electronic characteristics significantly. In this study, we investigate multilayer MoS 2 Schottky barrier FETs (SBFETs), emphasizing the metal-contact impact on device performance via computational device modeling. We find that p -type MoS 2 SBFETs may be built with appropriate metals and gate voltage control. Furthermore, we propose ambipolar multilayer MoS 2 SBFETs with asymmetric metal electrodes, which exhibit gate-voltage dependent ambipolar transport behavior through optimizing metal contacts in MoS 2 device. Introducing a dual-split gate geometry, the MoS 2 SBFETs can further operate in four distinct configurations: p  -  p , n  -  n , p  -  n , and n  -  p . Electrical characteristics are calculated, and improved performance of a high rectification ratio can be feasible as an attractive feature for efficient electrical and photonic devices., (Creative Commons Attribution license.)

A few studies have investigated the effects of laparoscopic cystectomy for endometrioma on ovarian reserve using serum anti-Müllerian hormone (AMH) levels and have shown inconsistent results. This prospective study was performed to estimate early changes in serum AMH after laparoscopic surgery for endometrioma. In 27 women aged 21-46 years who underwent laparoscopic unilateral cystectomy (n = 13) or oophorectomy (n = 14) for endometrioma, we measured pre- and postoperative serum AMH levels at baseline and 1 week, 1 month, and 3 months after surgery. Serial changes in serum AMH levels were analyzed according to the operation type using analysis of variance. Mean levels of serum AMH decreased significantly immediately after surgery and remained for up to 3 months in both operation types (P = 0.002 for cystectomy group and P <0.001 for oophorectomy group). In addition, the serum AMH levels showed similar patterns of change after cystectomy or oophorectomy. In conclusion, laparoscopic ovarian cystectomy for endometrioma appears to decrease serum AMH levels immediately after surgery.