CMOS and beyond CMOS
Discover why imec is the premier R&D center for advanced logic & memory devices. anced logic & memory devices.
Connected health solutions
Explore the technologies that will power tomorrow’s wearable, implantable, ingestible and non-contact devices.
Life sciences
See how imec brings the power of chip technology to the world of healthcare.
Sensor solutions for IoT
Dive into innovative solutions for sensor networks, high speed networks and sensor technologies.
Artificial intelligence
Explore the possibilities and technologies of AI.
More expertises
Discover all our expertises.
Research
Be the first to reap the benefits of imec’s research by joining one of our programs or starting an exclusive bilateral collaboration.
Development
Build on our expertise for the design, prototyping and low-volume manufacturing of your innovative nanotech components and products.
Solutions
Use one of imec’s mature technologies for groundbreaking applications across a multitude of industries such as healthcare, agriculture and Industry 4.0.
Venturing and startups
Kick-start your business. Launch or expand your tech company by drawing on the funds and knowhow of imec’s ecosystem of tailored venturing support.
/Job opportunities/Towards Two-Dimensional Transition Metal Dichalcogenides with manufacturing-compatible quality

Towards Two-Dimensional Transition Metal Dichalcogenides with manufacturing-compatible quality

PhD - Leuven | More than two weeks ago

Mastering how to control the morphology of only three-atom-thick semiconducting layers across 300 mm substrates at the fore-front of semiconductor research

Meeting the technology requirements for future semiconductor devices represents a formidable challenge which can be overcome by exploring novel device architectures and materials. In view of their ultra-thin body nature, two-dimensional materials are ideal candidates to further advance CMOS technology to smaller physical dimensions. The most representative 2D material, graphene, has limited applicability in this respect due to the absence of a bandgap. Transition metal dichalcogenides (MX2, with M a transition metal and X a chalcogen) such as molybdenum and tungsten disulfide (MoS2, WS2) do attract increasing interest as their electronic and optical properties can be tuned over a wide range [1]. As such, a variety of applications with electronical, optical and sensing functions fall within reach of MX2 layers [1,2].

However, a key prerequisite to industrial exploitation of such disruptive materials is the availability of a manufacturable deposition approach for MX2. Ideally, the deposition technique should provide monolayer growth control and a highly crystalline structure uniformly across industry's standard 300mm wafer size. Despite exploration of various deposition approaches, the material quality remains immature as exemplified by poor electronic carrier mobility as compared to theoretical predictions [3-5]. Although metal-organic chemical vapor deposition (MOCVD) is widely accepted as the most promising deposition technique, fundamental understanding is lacking on how to design chemical deposition processes for MX2 layers, and control the morphologic and electronic properties of the deposited layers [4].

To address these challenges, the PhD project encompasses the following three research objectives:

  • Portray and compare the growth and nucleation mechanism of MoS2 and WS2 during MOCVD based on analysis of the composition, structure and morphology of the deposited layers.
  • From the obtained insight in the growth mechanism of MX2 layers, learn how to control the crystallinity and 2D structure, and evaluate how these physical properties impact the intrinsic electrical response
  • Develop novel deposition concepts to precisely engineer the 2D material structure and show ultimate transport performance in line with the theoretical properties

The 2D layers are grown on up to 300 mm substrates using state-of-the-art 300 mm clean room facilities and research infrastructure. The candidate will study the impact of precursors, and the starting surface on the composition, crystallinity, and morphology of the deposited layers through a suite of advanced and complementary characterization techniques (such as Rutherford Backscattering Spectroscopy, (conductive) atomic force microscopy). Based on these research objectives, the candidate will develop a methodology to carefully tune the 2D material structure, and benchmark the charge carrier transport properties of the deposited layers as compared to theoretical predictions [5].  


[1] D. Akinwande, et al., Nature 2019, 573, 507; [2] M. Chhowalla, et al., Nat. Rev. Mater. 2016, 1, 16052; [3] J. Zheng, et al., Adv. Mater. 2017, 29, 1604540; [4] J. Jiang, et al., Chem. Soc. Rev., 2019, 48, 4639; [5] W. Zhang, et al, Nano Res. 2014, 7, 1731​


Required background: Physics, Material engineering, Material science, Nanotechnology, Chemistry

Type of work: 20% literature study and theory, 80% experimental work

Supervisor: Annelies Delabie, ,

Daily advisor: Benjamin Groven

The reference code for this position is 2020-007. Mention this reference code on your application form.

This website uses cookies for analytics purposes only without any commercial intent. Find out more here. Our privacy statement can be found here. Some content (videos, iframes, forms,...) on this website will only appear when you have accepted the cookies.