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You searched on: Author: Yaw Obeng

Displaying records 1 to 10 of 35 records.
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1. Towards Understanding Early Failures Behavior during Device Burn-In: Broadband RF Monitoring of Atomistic Changes in Materials
Published: 8/18/2016
Authors: Yaw S Obeng, Chukwudi Azubuike Okoro, Papa K. Amoah, Victor H Vartanian
Abstract: In this paper, we attempt to understand the physico-chemical changes that occur in devices during device ,burn-inŠ. We discuss the use of low frequency dielectric spectroscopy to detect, characterize and monitor changes in electrical defects pres ...

2. Subsurface Imaging of Ungrounded Metal Lines Embedded in Dielectric with the Scanning Microwave Microscope
Published: 12/17/2015
Authors: Lin You, Jungjoon Ahn, Yaw S Obeng, Joseph J Kopanski
Abstract: We demonstrate the ability of the scanning microwave microscope (SMM) to measure the subsurface location of ungrounded. 1.2-μm wide metal lines embedded in a dielectric film. The SMM was used to image Al-Si-Cu metal lines in a test chip that ...

3. Dielectric Spectroscopic Detection of Early Failures in 3-D Integrated Circuits
Published: 10/11/2015
Authors: Yaw S Obeng, Chukwudi Azubuike Okoro, Jungjoon Ahn, Lin You, Joseph J Kopanski
Abstract: The commercial introduction of three dimensional integrated circuits (3D-ICs) has been hindered by reliability challenges, such as stress related failures, resistivity changes, and unexplained early failures. In this paper, we discuss a new RF-ba ...

4. Experimental Measurement of the Effect of Copper Through-Silicon Via Diameter on Stress Buildup Using Synchrotron-based X-ray Source
Published: 6/20/2015
Authors: Chukwudi Azubuike Okoro, Lyle E Levine, Yaw S Obeng, Ruqing Xu
Abstract: In this work, the effect of Cu through-silicon via (TSV) diameter on stress buildup in Cu TSVs was experimentally determined using synchrotron-based X-ray microdiffraction technique. With the aid of atomic force microscopy (AFM), Cu protrusion was al ...

5. Nanoelectronic Structural Information with Scanning Probe Microscopes
Published: 6/14/2015
Authors: Joseph J Kopanski, Lin You, Jungjoon Ahn, Yaw S Obeng
Abstract: Scanning probe microscope (SPM) based methods to obtain subsurface structural information about nano-structured materials are described. A test structure chip containing structures to produce various surface electric field gradients, spatially varyin ...

6. Experimentally, How Does Cu TSV Diameter Influence its Stress State?
Published: 5/27/2015
Authors: Chukwudi Azubuike Okoro, Lyle E Levine, Yaw S Obeng, Ruqing Xu
Abstract: In this work, an experimental study of the influence of Cu through-silicon via (TSV) diameter on stress build up was performed using synchrotron-based X-ray microdiffraction technique. Three Cu TSV diameters were studied; 3 µm, 5 µm and 8 µm, all of ...

7. Electromagnetic Field Test Structure Chip for Back End of the Line Metrology
Published: 3/23/2015
Authors: Lin You, Jungjoon Ahn, Emily Hitz, Jonathon Michelson, Yaw S Obeng, Joseph J Kopanski
Abstract: A test chip to produce known and controllable gradients of surface potential and magnetic field at the chip surface and suitable for imaging with various types of scanning probe microscopes is presented. The purpose of the test chip is to evaluate va ...

8. Influence of Metal¿MoS2 Interface on MoS2 Transistor Performance: Comparison of Ag and Ti Contacts
Published: 12/16/2014
Authors: Hui H. Yuan, Guangjun Cheng, Lin You, Haitao Li, Hao Zhu, Wei Li, Joseph J Kopanski, Yaw S Obeng, Angela R Hight Walker, David J Gundlach, Curt A Richter, D. E Ioannou, Qiliang Li
Abstract: In this work, we present a study of enhancing MoS2 transistor performance by using proper metal contact. We found that the on-state current of MoS2 field-effect transistors with 30 nm Au/ 30 nm Ag contacts is enhanced more than 60 times and the subth ...

9. Broad-Band Microwave-Based Metrology Platform Development: Demonstration of In-Situ Failure Mode Diagnostic Capabilities for Integrated Circuit Reliability Analyses
Published: 11/7/2014
Authors: Lin You, Chukwudi Azubuike Okoro, Jungjoon Ahn, Joseph J Kopanski, Yaw S Obeng, Rhonda R Franklin
Abstract: In this paper, we discuss the use of broadband high frequency electromagnetic waves (RF) to non- destructively identify, classify and characterize performance-limiting defects in emerging nanoelectronic devices. As an illustration, the impact of t ...

10. Non-destructive Measurement of the Residual Stresses in Copper Through-Silicon Vias using Synchrotron Based Micro-beam X-ray Diffraction
Published: 7/1/2014
Authors: Chukwudi Azubuike Okoro, Lyle E Levine, Yaw S Obeng, Klaus Hummler, Ruqing Xu
Abstract: In this study, we report a new method for achieving depth resolved determination of the full stress tensor in buried Cu through-silicon vias (TSVs), using synchrotron based X-ray micro-diffraction technique. Two adjacent Cu TSVs were analyzed; on ...

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