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Search Publications by: Daniel Josell (Fed)

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Displaying 1 - 25 of 146

Improved Uniformity in Glass TSV Filling by Asymmetric Dwell Pulsed Potential Deposition

April 1, 2026
Author(s)
Eunsoo Shim, Youjung Kim, Ji Young Park, Mathew Weimer, Sara Harris, David Raciti, Bongyoung Yoo, Jae-Hong Lim, Yong-Ho Chao, Thomas Moffat, Daniel Josell
Filling of through vias in glass interposers is explored using an acid copper sulfate electrolyte containing dilute chloride and a polyether suppressor additive. Cyclic voltammetry with a rotating disk electrode shows that suppression breakdown and

Selecting the complexity of the Moore-Penrose pseudoinverse for emission ghost imaging

December 2, 2025
Author(s)
Kevin Coakley, Huaiyu Chen-Mayer, Bruce Ravel, Daniel Josell, Nikolai Klimov, Daniel Hussey
We reconstruct X-ray fluorescence signals produced by synchrotron X-rays. In our method, we select the complexity of a Moore-Penrose pseudoinverse by a data-driven method, and study how systematic errors affect results for simulated data.

Synchrotron radiation based analyzer-free dual-phase dark-field lung imaging approach for radiography and CT

November 4, 2025
Author(s)
Daniel Josell, Simon Spindler, Alexandre Pereira, Caori Organista, Marie-Christine Zdora, Goran Lovric, Ginevra Lautizi, Christian Dullin, Adriano Contillo, Elena Longo, Nicolo Sodini, Lorenzo D'Amico, Lucia Romano, Konstantins Jefimovs, MIchal Rawlik, Giulana Tromba, Marco Stampanoni
Lung diseases such as chronic obstructive pulmonary disease are a major health burden to the society, where early detection plays a crucial role for treatment success. For detection, as well as diagnosis and serial evaluation, imaging plays a major role

Deep-reactive-ion-etching in X-ray grating fabrication: a review

September 8, 2025
Author(s)
Daniel Josell, Zhitian Shi, Konstantins Jefimovs, Joan Vial Comamala, Alexandre Pereira, Marco Stampanoni, Lucia Romano
The development of grating fabrication shares its journey with the development of X-ray phase contrast imaging. Indeed, the fabrication of gratings with features of sufficiently high aspect ratio is one of the bottlenecks preventing the widespread

Quantifying grating defects in X-ray Talbot-Lau interferometry through a comparative study of two fabrication techniques

April 24, 2025
Author(s)
Alexandre Pereira, Simon Spindler, Zhitian Shi, Lucia Romano, Michal Rawlik, Federica Marone, Martin Stauber, Marco Stampanoni, Daniel Josell
The performance of an X-ray grating interferometry system depends on the geometry and quality of the gratings. Fabrication of micrometer-pitch high-aspect-ratio gold gratings, which are essential for measuring small refraction angles at higher energies, is

Bottom-up Gold Filling of Sub-Micrometer Wide Trenches

April 3, 2025
Author(s)
Daniel Josell, Lucia Romano, Konstantins Jefimovs
A 〖Bi〗^(3+)-stimulated Au electrodeposition process in slightly alkaline 〖Na〗_3 Au(〖SO〗_3 )_2+〖Na〗_2 〖SO〗_3 electrolytes has been previously demonstrated for void-free bottom-up filling of progressively deeper and higher aspect trenches in gratings for

Fabrication of Ultra-Thick Masks for X-ray Phase Contrast Imaging at Higher Energy

February 16, 2025
Author(s)
Daniel Josell, Alessandro Rossi, Sandro Olivo, ioannis Papakonstantinou, Ian Buchanon, Alberto Astolfo, Anton Charman, Daniel Briglin
X-ray phase contrast imaging (XPCI) provides higher sensitivity to low absorbing objects that can be invisible to conventional attenuation-based X-ray imaging. This technique's main application has been so far mostly focused on medical areas at relatively

A Four-Grating Interferometer for X-Ray Multi-Contrast Imaging

March 24, 2024
Author(s)
Daniel Josell, Houxun Miao, James Williams, Jr.
Background: X-Ray multi-contrast imaging with gratings provides a practical method to detect the differential phase and dark-field contrast images in addition to the traditional X-ray absorption image in a laboratory or hospital environment. Systems have

Bottom-up Au Filling of Trenches in Curved Wafers

March 4, 2024
Author(s)
Daniel Josell, Thomas P. Moffat, Thomas Gnaupel-Herold, David Raciti, Martin Stauber, Yu Q, Liyang Chen, M Rawlik, Marco Stampanoni, Lucia Romano
A 〖Bi〗^(3+)-stimulated Au electrodeposition process in slightly alkaline 〖Na〗_3 Au(〖SO〗_3 )_2+〖Na〗_2 〖SO〗_3 electrolytes has been previously demonstrated for void-free extreme bottom-up filling of trenches with aspect ratios (height/width) exceeding 60 in

Implementation of a dual-phase grating 1 interferometer for multi-scale characterization of 2 building materials by tunable dark-field imaging

March 1, 2024
Author(s)
Daniel Josell, Caori Organista, Ruizhi Tang, Zhitian Shi, Konstantins Jefimovs, Lucia Romano, Simon Splindler, Pierre Kibleur, Benjamin Blykers, Marco Stampanoni, Matthieu Boone
The multi-scale characterization of building materials is necessary to understand macroscale mechanical processes, with the goal of developing new, better materials aimed at sustainability. In materials science, imaging methods are often used to

Emission Ghost Imaging: reconstruction with data augmentation

February 1, 2024
Author(s)
Kevin J. Coakley, Heather H. Chen-Mayer, Bruce D. Ravel, Daniel Josell, Nikolai Klimov, Sarah Robinson, Daniel S. Hussey
Ghost Imaging enables 2D reconstruction of an object even though particles transmitted or emitted by the object of interest are detected with a single pixel detector without spatial resolution. This is possible because the incident beam is spatially

Superconformal Film Growth: From Smoothing Surfaces to Interconnect Technology

April 20, 2023
Author(s)
Thomas P. Moffat, Trevor Braun, David Raciti, Daniel Josell
CONSPECTUS: State-of-the-art manufacturing of electronics involves the electrodeposition of Cu to form 3-D circuitry of arbitrary complexity. This ranges from nanometers wide interconnects between individual transistors to increasingly large multilevel

Extreme Bottom-up Gold Filling of High Aspect Ratio Features

February 27, 2023
Author(s)
Daniel Josell, Thomas P. Moffat
Where copper interconnects fabricated using superconformal electrodeposition processes have enabled dramatic advances in microelectronics over the last quarter century, gold filled gratings fabricated using superconformal 〖Bi〗^(3+)-mediated bottom-up

Mechanism of Bismuth Stimulated Bottom-up Gold Feature Filling

December 30, 2022
Author(s)
Daniel Josell, Trevor Braun, Thomas P. Moffat
The mechanism that underlies 〖Bi〗^(3+)-stimulated extreme bottom-up Au filling of trenches and vias in slightly alkaline 〖Na〗_3 Au(〖SO〗_3 )_2+〖Na〗_2 〖SO〗_3 electrolytes is explored. The remarkable void-free feature filling and self-passivation behavior

Robust Bottom-Up Gold Filling of Deep Trenches and Gratings

March 25, 2022
Author(s)
Daniel Josell, William Alexander Osborn, Maureen E. Williams
This work extends application of an extreme variant of superconformal Au electrodeposition to deeper device architectures while exploring factors that constrain its function and thereby the robustness of void-free processing. The unconventional bottom-up

Effect of Chloride on Microstructure in Cu Filled Microscale Through Silicon Vias

November 2, 2021
Author(s)
Daniel Josell, Thomas P. Moffat, Trevor Braun
The microstructure of copper filled through silicon vias deposited in a CuSO4 + H2SO4 electrolyte containing micromolar concentrations of deposition rate suppressing poloxamine and chloride additives is explored using electron backscatter diffraction

Orientation and Magnetic Properties of FePt and CoPt Films Grown on MgO(110) Single-Crystal Substrate by Electron-Beam Coevaporation

October 12, 2021
Author(s)
M-H Yu, Hiroyuki Ohguchi, Antonio Zambano, Ichiro Takeuchi, J P. Liu, Daniel Josell, Leonid A. Bendersky
We have studied the orientation and magnetic properties of FePt and CoPt films deposited by electron-beam co-evaporation on MgO(110) single-crystal substrates at different substrate temperatures between 500 and 700 degrees C. We observed that the long

The Effect of Interfacial Free Energies on the Stability of Microlaminates

October 12, 2021
Author(s)
A C. Lewis, A B. Mann, D V. Heerden, Daniel Josell, Timothy P. Weihs
Laminated composites with polycrystalline layers typically break down at high temperatures through grain boundary grooving and the pinch-off of individual layers. Such materials, when exposed to high temperatures, develop grooves where grain boundaries
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