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Author: Yaw Obeng

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1. A Detailed Failure Analysis Examination of the Effect of Thermal Cycling on Cu TSV Reliability
Published: 1/1/2014
Authors: Chukwudi Azubuike Okoro, June W. Lau, Yaw S Obeng, Klaus Hummler
Abstract: In this work, a detailed failure analysis of the physical root cause for the increase in electrical resistance and radio-frequency (RF) transmission coefficient of through-silicon via (TSV) daisy chain was investigated. Six different failure modes we ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913115

2. Back-End-of-Line Test Structure Design and Simulation for Subsurface Metrology with Scanning Probe Microscopy
Published: 12/13/2013
Authors: Lin You, Emily Hitz, Jungjoon Ahn, Yaw S Obeng, Joseph J Kopanski
Abstract: As demands in the semiconductor industry call for further miniaturization and performance enhancement of electronic systems, the traditional planar (2D) electronic interconnection and packaging technologies show their difficulties in meeting the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915013

3. Development of a Methodology to Determine Risk of Counterfeit Use
Published: 6/5/2013
Authors: Mark Schaffer, Yaw S Obeng
Abstract: Counterfeit components have become a multi-million dollar, yet undesirable, part of the electronics industry. The profitability of the counterfeit industry rests in large part on its ability to recognize supply constraints and quickly respond, effect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914105

4. Accelerated Stress Test Assessment of Through-Silicon Vias Using RF Signals
Published: 6/1/2013
Authors: Chukwudi Azubuike Okoro, Pavel Kabos, Jan Obrzut, Klaus Hummler, Yaw S Obeng
Abstract: In this work, radio frequency (RF) signal is demonstrated as an effective metrology tool for the assessment of the effect of thermal cycling on the reliability of through-silicon via (TSV) stacked dies. It was found that RF signal integrity of TSV da ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912850

5. Use of RF-Based Technique as a Metrology Tool for TSV Reliability Analysis
Published: 5/28/2013
Authors: Chukwudi Azubuike Okoro, Yaw S Obeng, Jan Obrzut, Pavel Kabos, Klaus Hummler
Abstract: In this work, we used radio frequency (RF) based measurement technique is used as a prognostic tool for the assessment of the effect of thermal cycling on the reliability of through-silicon via (TSV) stacked dies. It was found that RF signal integrit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913332

6. X-Ray Micro-Beam Diffraction Determination of Full Stress Tensors in Cu TSVs
Published: 5/28/2013
Authors: Chukwudi Azubuike Okoro, Lyle E Levine, Oleg A Kirillov, Yaw S Obeng, Ruqing Xu, Jonathan Z Tischler, Wenjun Liu, Klaus Hummler
Abstract: We report the first non-destructive, depth resolved determination of the full stress tensor in Cu through-silicon vias (TSVs), using synchrotron based micro-beam X-ray diffraction. Two adjacent Cu TSVs were studied; one deliberately capped with SiO2, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913440

7. Measurement Science for "More-Than-Moore" Technology Reliability Assessments
Published: 10/12/2012
Authors: Chukwudi Azubuike Okoro, Jungjoon Ahn, Meagan V. Kelso, Pavel Kabos, Joseph J Kopanski, Yaw S Obeng
Abstract: In this paper, we will present an overview of metrology issues and some of the techniques currently under development in our group at NIST, aimed at understanding some of the potential performance limiting issues in such highly integrated systems ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911714

8. Metrology for Nanosystems and Nanoelectronics Reliability Assessments
Published: 8/20/2012
Authors: Yaw S Obeng, Chukwudi Azubuike Okoro, Joseph J Kopanski
Abstract: The traditional models and techniques for studying reliability in integrated circuits may not be appropriate for nanoelectronics and nanosystems. In this paper, we present an overview of a number of materials and metrology techniques currently un ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911433

9. A Case Study on the Impact of Local Material Chemistry on the Mechanical Reliability of Packaged Integrated Circuits: Correlation of the Packaging Fallout to the Chemistry of Passivation Dielectrics in an Al-Cu System
Published: 3/19/2012
Authors: Chukwudi Azubuike Okoro, Yaw S Obeng
Abstract: In this paper, we use a variety of analytical techniques to examine the impact of local chemistry, and the mechanical properties, of the encapsulation dielectric films on the post-packaging device rejection rate of integrated circuit devices. A stro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909379

10. Towards clean and crackless transfer of graphene
Published: 1/2/2012
Authors: Xuelei X. Liang, Brent A Sperling, Irene G. Calizo, Guangjun Cheng, Christina Ann Hacker, Qin Zhang, Yaw S Obeng, Kai Yan, Hailin Peng, Qiliang Li, Xiaoxiao Zhu, Hui Yuan, Angela R Hight Walker, Zhongfan Liu, Lianmao Peng, Curt A Richter
Abstract: We present the results of a thorough study of wet chemical methods for transferring chemical vapor deposition grown graphene from the metal growth substrate to a device compatible substrate. Based on these results, we have developed a ,modified RCA c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908399



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