Curran welcomed PhD student Ethan Errington from Jerry Heng’s group (Imperial College London, Chemical Engineering Dep.) to the Department of Chemistry for some XPS experiments on their group’s latest samples. Jerry Heng’s group are interested in using XPS to better understand the surface chemistries of oil-in-water adsorbants. This marks the first collaboration between the groups, and we are thrilled to be providing our XPS expertise! Ethan and Curran first met each other 8 years ago when they both studied Chemical Engineering at the University of Leeds. They have both come a long way since their last collaboration which was designing a heat exchanger in their second year of their undergraduate degree.
Curran and Aysha from the group were joined by Benjamin Moss from Imperial College London for four days of experiments at beamline I09 at the Diamond Light Source. They were able to measure several sets of MXene and MAX phase samples from our long-time collaborator Christina Birkel at Arizona State University. The measurements were performed with both soft and hard X-rays and will hopefully shed light on the surface and bulk characteristics of these novel materials.
Benjamin also brought some exciting metal oxide samples with him, but they put up a fight and many hours were required to overcome charging issues! However, the team powered through and after many tests, they were able to collect a good set of data. The cherry on the top was the collection of a beautiful Ti 1s spectrum of the material. Aside from the success of the measurements one highlight was definitely the view of the moon on our second night as we stumbled back to the beam line after chocolate sponge cake and chocolate custard.
Nathalie and Curran both presented their projects as part of the departmental final year PhD talks in July. Nathalie shared her results on Structural & Electronic Effects of X-ray Irradiation on Prototypical Catalysts and Curran shared his work on X-ray Photoelectron Spectroscopy of TixW1-x Diffusion Barriers. Both talks received excellent feedback from our departmental community and Curran was named runner up for the Clarke Prize for the best talk in the inorganic chemistry section. Congratulations!
As the academic year comes to a close (and with Anna’s maternity leave imminent) we took the opportunity to take a new group photograph. This is the “group approved” version of the photograph – we’ll keep the outtakes to ourselves 🙂
In April a team from the group including Curran, Aysha, Maria and Anna spent several days at beamline I09 at the Diamond Light Source for a combined SXPS/HAXPES experiment on a number of oxide materials, all relevant for electronic device applications.
We were hunting for both chemical state information and final state effects from core level spectra as well as for signatures of the electronic structure of the materials, including some 2D electron gases at buried interfaces. In order to avoid beam induced changes to the samples we used the defocussed setup at I09 and were rewarded with some intensely bright and large beam illumination on the samples (see image below). The electronic structure experiments needed extended acquisition times to obtain the needed signal quality, so we even had time to catch some fresh air and walk to the top of ISIS hill providing a great view of Harwell campus and the surrounding greenery.
This was also Maria’s first synchrotron experience. She is spending six months in the group as a visiting PhD student as part of her PhD, which she is undertaking at the University of Padua, Italy, under the supervision of Prof Alessandro Martucci. She works on crystallisation of solution-based metal oxides on temperature-sensitive substrates.
Hot off the press! Check out our latest collaboration with colleagues from Infineon Technologies Austria, KAI and HarwellXPS, exploring the interface stability of TiW/Cu heterojunctions using SXPS and HAXPES. This work marks the second publication in a series by Curran Kalha on TiW diffusion barriers and continues a long and fruitful collaboration with beamline I09 at the Diamond Light Source.
Diffusion barriers are essential components in power semiconductor devices and are designed to isolate metallisation schemes from the semiconductor devices. The binary alloy of titanium-tungsten (TiW) is an established diffusion barrier for copper metallisation schemes. However, little has been established regarding the chemical state of the TiW/Cu interface or the possible degradation mechanisms of the barrier during annealing.
In our recent paper in Journal of Applied Physics (the preprint is also on arxiv), we show that the TiW alloy is an excellent barrier for copper metallisation schemes, successfully isolating the copper after annealing for as long as 5 h at 400°C using both synchrotron-based SXPS and HAXPES. Under thermal stress the barrier starts to degrade via the out-diffusion of Ti, but using laboratory-based SXPS at HarwellXPS it is clear that the Ti quantity lost in the diffusion barrier does not significantly impact the performance of the barrier.
Stay tuned for more TiW research and the completion of Curran’s TiW trilogy (and maybe a prequel or origin story too).
Integrating inorganic materials, that show great potential for sensing application, into platforms that are suitable for the industrial production of cheap, non-invasive sensors is of great importance for their broad implementation. In our recent open access paper in Materials Research Express, we show the successful integration of copper oxide based electrodes for glucose sensing on printed circuit board (PCB) technology. Together with collaborators at the University of Bath led by Dr Despina Moschou we could show that direct oxidation on PCB compatible substrates is possible and how production parameters including annealing duration and temperature influence the surface morphology and chemistry as well as influencing the resulting electrochemical sensing properties.
The work in the paper is based predominantly on the Masters research of Shijia Liu and Ayse Ay, who did their Masters projects as part of their MSc in Advanced Materials Science and Engineering degrees in the group in the academic year 2017/18. The research also included the involvement of two UROP (Undergraduate Research Opportunities Programme) students, Qiaochu Luo and Xiangqi Hu.
After spending a week at EMPA in Zurich, Switzerland, depositing high quality TiW thin films in February, Curran, Nathalie and Anna travelled to DESY, Hamburg, Germany, in the first week of March to collect HAXPES data on them. We were back at one of our favourite HAXPES beamlines, P22 at PETRA III, and the work was, as always, expertly supported by the local team of Dr Christoph Schlueter and Dr Andrei Hloskovsky.
In order to ensure that the samples where in the best possible condition for measurement we needed to apply quite an involved level of logistics including vacuum sealing, glove box transferring, and in-situ sputtering. This enabled us to measure the films in their truly metallic state without interference from surface oxidation and contamination. Although HAXPES enables to probe the bulk of a sample, overlying surface oxides can significantly influence and perturb the HAXPES spectral quality. We both explored the influence of Ti/W composition on the electronic structure as well as a challenging experiment to try and probe the buried interface between TiW and the underlying SiO2/Si substructure. We also had time to explore the local offerings of cake and caffeinated beverages.
In the second half of February Curran and Anna spent a week at EMPA, the Swiss Federal Laboratories for Materials Science and Technology, in Zurich, Switzerland, to deposit a range of TiW films for an upcoming HAXPES experiment at DESY, Hamburg, Germany. The samples will be used to increase our understanding of mixed metal barrier materials for power electronics.
This collaboration was made possible by the award of a UCL Global Engagement Fund (GEF), a funding route available to UCL academics that supports collaboration with colleagues based in other countries.
Our colleagues at EMPA, Dr Sebastian Siol and Dr Siarhei Zhuk were excellent hosts and shared their extensive knowledge on the deposition of such metal systems. In parallel, Curran was able to immediately characterise all deposited samples using a combination of X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). This provided a solid characterisation basis to finetune deposition parameters and achieve a high level of control over film thicknesses and composition.
Although it was an intense week of work, there was still time to enjoy the finer side of life in Zurich, including sampling some local delicacies including Schnitzel (pictured below), Raclette and a very good amount of Swiss chocolate.
In early February a team led by Curran, including Prajna, Yujiang and Anna, visited beamline I09 at Diamond Light Source in an attempt to collect soft and hard X-ray photoelectron spectroscopy (SXPS and HAXPES) data on the pure metals titanium and yttrium. Sounds simple, but obtaining clean metal surfaces, and more importantly maintaining clean surfaces during measurement, is a real challenge for these two. Titanium in particular finds application as a so-called getter material, where its high reactivity is used to absorb stray molecules in vacuum chambers to achieve ultra-high vacuum (UHV) conditions. Great for vacuum chambers, not ideal when you need to keep a titanium surface free of adsorbates. After some not entirely successful previous attempts, a combination of ex-situ chemical etching, in-situ argon etching, and keeping the samples at a few hundred toasty degrees during measurement proofed to be the magical combination to obtain perfect metallic spectra. Such high quality reference datasets are crucial to aid the exploration and understanding of complex systems, where convoluted spectral data can prove to be a formidable challenge. This data will support Curran’s ongoing work on metallisation schemes for power electronics (read more about some of the work here and here) and further projects on energy materials and catalysts. As always the beamtime was masterfully supported by Pardeep Kumar. This was also the first synchrotron experience for Prajna and Yujiang.