New Paper of Fermi Level Pinning on W-TMDs

Origins of Fermi Level Pinning for Ni and Ag Metal Contacts on Tungsten Dichalcogenides

Xinglu Wang,Yaoqiao Hu, Seong Yeoul Kim, Rafik Addou, Kyeongjae Cho, and Robert M. Wallace
https://doi.org/10.1021/acsnano.3c06494

Tungsten transition metal dichalcogenides (W-TMDs) are intriguing due to their properties and potential for application in next-generation electronic devices. However, strong Fermi level (EF) pinning manifests at the metal/W-TMD interfaces, which could tremendously restrain the carrier injection into the channel. In this work, we illustrate the origins of EFpinning for Ni and Ag contacts on W-TMDs by considering interface chemistry, band alignment, impurities, and imperfections of W-TMDs, contact metal adsorption mechanism, and the resultant electronic structure. We conclude that the origins of EF pinning at a covalent contact metal/W-TMD interface, such as Ni/W-TMDs, can be attributed to defects, impurities, and interface reaction products. In contrast, for a van der Waals contact metal/TMD system such as Ag/W-TMDs, the primary factor responsible for EF pinning is the electronic modification of the TMDs resulting from the defects and impurities with the minor impact of metal-induced gap states. The potential strategies for carefully engineering the metal deposition approach are also discussed. This work unveils the origins of EF pinning at metal/TMD interfaces experimentally and theoretically and provides guidance on further enhancing and improving the device performance

Synthesis of Micron-Sized WS2 Crystallites Using ALD and post Sulfur Annealing

This new paper reports the first synthesis of micron-sized WS2 crystals by ALD using bis(t-butylimido)bis(trimethylsilylmethyl)tungsten and H2S, followed by sulfur annealing. The films are nanocrystalline with mixed phases and impurities before annealing but show Raman peaks of WS2 and larger crystals after annealing. The substrate affects the shape of the crystals: silicon leads to flake pyramids or flowers, ZnS leads to crumpled flowers, and Al2O3 leads to thin flakes.

Synthesis of Micron-Sized WS2 Crystallites Using Atomic Layer Deposition and Sulfur Annealing

New Paper on APXPS

Just published: Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) was used to investigate the thermal decomposition of acetic acid on Pd(111). The paper serves as an excellent demonstration of how APXPS can offer valuable insights into the intricate chemistry of surface reactions.

Ambient Pressure X-Ray Photoelectron Study on the Thermal Decomposition of Acetic Acid on Pd(111) Hoan K.K. Nguyen, Rafik Addou, Kingsley C. Chukwu, Gregory S. Herman, and Líney Árnadóttir J. Phys. Chem. C 2023, 12724, 11472–11480

Vacuum System Technician

Location: Ottawa

We are seeking a highly skilled and experienced Technician to join our team. The successful candidate will have expertise in vacuum/pumping systems maintenance, troubleshooting, and inventory management. This is a hands-on role that requires strong attention to detail and a commitment to ensuring that all systems are maintained to the highest standards.

Key Responsibilities: 

- Perform routine maintenance and repair of vacuum systems
- Troubleshoot and diagnose issues with vacuum systems, controllers, and components
- Perform preventative maintenance tasks to ensure the smooth operation of systems
- Write and update standard operating procedures (SOPs) for vacuum systems
- Ensure that all safety procedures are followed while working on vacuum systems
- Maintain accurate records of maintenance and repair activities
- Track inventory of vacuum system components
- Communicate with engineers and scientists and suppliers to resolve complex issues

Requirements:

- A minimum of 3 years of experience as a Technician in a vacuum system maintenance role
- In-depth knowledge of vacuum systems and hardware
- Strong troubleshooting and problem-solving skills
- Ability to write and understand SOPs
- Familiarity with safety procedures and protocols for working with vacuum systems
- Experience with inventory management and tracking

We offer a competitive salary and benefits package, as well as opportunities for professional growth and development. If you have the skills and experience we are looking for, we encourage you to apply for this exciting opportunity.

To apply, please send me your resume. We look forward to hearing from you!

Surface Scientist Wanted!

We are seeking a highly motivated and experienced surface scientist to join our R&D team. The ideal candidate will have a strong background in Surface Science, specifically with experience in qPlus.

Responsibilities:
Design, conduct, and analyze experiments using qPlus/nc-AFM
Interpret data and provide insightful recommendations
Collaborate with cross-functional teams to support project goals
Contribute to the development of new techniques and methodologies
Present findings and results at internal and external meetings

Requirements:
Ph.D. in Physics, Materials Science, Chemistry, or a related field
Strong expertise in QPlus-AFM
Excellent communication and analytical skills
Ability to work in a team environment and deliver results in a timely manner

We offer a competitive salary and benefits package, as well as opportunities for professional growth and development. If you are a highly motivated individual with a passion for Surface Science and experience in qPlus/nc-AFM, we encourage you to apply.

Know anyone who might be interested? Please share this post and send your resume to us for consideration.

We look forward to hearing from you!"

We are currently hiring: SPM Experimentalist, Synthetic Chemist, Back End Software Developer, Scientific Python Developer

We are CBN, Canadian Bank Note Company, Limited. Headquartered in Ottawa, Ontario, with primary manufacturing operations based in Canada. CBN employs over 1,500 people worldwide. CBN was established in 1897 to supply security-printed products to the Canadian government, which it has done continuously ever since. The supply of Canadian currency, passports, and postage stamps are three important activities entrusted to the Company and as a result the company is recognized as part of Canada’s critical infrastructure. CBN has expanded from this base to the supply of the same and similar products to other countries and today more than half of CBN’s sales originate outside of Canada. 

CBN creates secure documents with original designs that include a comprehensive set of intricate security features, making them extremely difficult to counterfeit. Our scientists and production team have previously developed and deployed leading innovations in substrates, inks, coatings and more. With this proven history of technical leadership, CBN has the resources and insight to develop this new, more broadly applicable technology. 

We are developing a new manufacturing technology that is automated, of high precision, and heavily parallelized.  We will use it to make counterfeit-proof banknotes, passports, and drivers licenses.  This technology has broader applicability to secure documents of all types, as well as to computers, medical uses, and environmental remediation.  To support this effort, we are hiring a team of subject matter expert scientists and engineers.   

We are currently hiring:

- SPM Experimentalist
Keywords: UHV SPM, Ultra High Vacuum Scanning Probe Microscopy, Equipment Construction, Experimental Design, Surface Chemistry, Surface Reaction, Molecular Manipulation, Transfer print patterning, Molecular Deposition. 

Duties and Responsibilities:

* Workstation Operation and Experimental Design 

* Operate SPM hardware and perform process development experiments 

* Work with the engineering team to propose, design, construct, and test nanoscale structures and devices

* Rapid learning of the particular technical issues, challenges and solutions associated with this advanced nanotechnology 

* Document equipment modifications, experimental parameters, processes, and results 

*Assist in the specification and testing for new and upgraded engineering tools

To apply for the SPM Experimentalist position, please submit your application via LinkedIn at this link: https://www.linkedin.com/jobs/view/2911322341

- Synthetic Chemist

We are seeking an organic chemist to help design and synthesize our multifunctional organic nanomaterials. This role will collaborate closely with our surface science and computational chemistry teams to improve the performance of our target molecules.

We are searching for a scientist to synthesize chemical intermediates and finished materials in support of our discovery research. 

* Design, optimize, and troubleshoot multistep synthesis of organic and organometallic compounds
* Characterize, isolate, and purify sensitive target compounds
* Coordinate with chemistry lab members to keep lab fully operational
* Collaborate closely with an interdisciplinary team to design new synthetic targets.

Keywords: Synthetic Chemistry, Multistep organic synthesis, Organic chemist, Organic chemistry, Catalysis, Natural product synthesis, Target oriented synthesis, Physical organic chemistry, Radical chemistry, Photochemistry, Purification, Nuclear Magnetic Resonance Spectroscopy (NMR), High performance liquid chromatography (HPLC), Mass spectrometry. 

- Back End Software Developer

Duties and Responsibilities.
· Write effective, scalable code
· Develop back-end components to improve responsiveness and overall performance
· Integrate user-facing elements into applications
· Test and debug programs
· Improve functionality of existing systems
· Implement security and data protection solutions
· Assess and prioritize feature requests
· Coordinate with internal teams to understand user requirements and provide technical solutions

Keywords: Python, Golang, Docker, REST API, OpenCV, Developer, Web Development, Data, Algorithms, Database, SQL, NoSQL, PostgreSQL, MongoDB, InfluxDB, Linux, Data Pipeline, Airflow, MLflow, Extract Transform Load (ETL), Software Development, Testing, Jira, Back-End Developer

- Scientific Python Developer 

Keywords: Algorithm development, systems design, python, software testing, software documentation, Linux, version control, git, Jira, issue tracking, chemistry, physics, python3, numpy, scipy, cloud computing, go, Java, FORTRAN, C++, Rust, SQL, Neo4j, Oracle, MariaDB, MongoDB, Hadoop, Spark, Kafka, Cassandra, Pachyderm, Computational chemistry, cheminformatics, computational science, genetic algorithms, computational physics, applied mathematics, electrical engineering, computer engineering 

For more details or to apply to any open position, please email a copy of your resume to Kayla at ‘klebreto(at)cbnco.com’