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Christou, Aris

Aris Christou
Director, Graduate Program in Reliability Engineering
Fellow, IEEE
2309A Chemical and Nuclear Engineering Building

News About This Professor


Ph.D., University of Pennsylvania, 1971

Research Interests 

Radiation effects in microelectronics, radiation hard design methodologies and physics of failure of compound semiconductors in space applications. Materials degradation, radiation induced defects in metals, corrosion and high pressure induced transformations in steels and iron alloys.


Professor Aris Christou previously served as the Chair of the Department of Materials and Nuclear Engineering. He currently conducts research in compound semiconductor materials and process science, radiation effects in materials and devices, manufacturing science, and reliability. From 2000-2003, Dr. Christou was the Director of the NSF Center COEDIP, the Center of OptoElectronic Devices, Interconnects and Packaging. Prior to his appointments at the University of Maryland, he was a Professor of Electronic Materials at Rutgers University, and research scientist at the Naval Research Laboratory. He has authored two books and has been the editor of three others. Dr. Christou has more than 150 publications in archival journals and 14 patents (including two pending), and has organized international conferences in GaAs devices, materials and reliability. He is a Fellow of the IEEE, a Fullbright Fellow, a recipient of the DoD-Berman Publication Awards, and an IEEE Guest Lecturer. Professor Christou was the 2004 recipient of the INEER Achievement Award (International Network for Engineering Education and Research) for achievements in international education and research in engineering, as well as the recipient of the 2007 ASM International Burgess Memorial Award "For his seminal scientific contributions in the field of electronic materials, packaging and devices." Professor Christou is a member of APS, ASM, TMS and MRS, was the past President of the Federation of Materials Societies from 2004-2006, and is presently a member of the FMS Board of Trustees. Full Bio »


  • ENES100 : Introduction to Engineering Design
  • ENES 230: Introduction to Materials and Their Applications
  • ENMA 300: Introduction to Engineering Materials (formerly ENES 230)
  • ENMA 426/ENRE 447: Reliability of Materials
  • ENMA 463: Macroprocessing of Materials in Electronic Packaging
  • ENMA 626/ENRE600 : Reliability Engineering

Honors and Awards 

For a full list of honors and awards, please visit Professor Christou's web site

Books and Chapters 

Reliability of Compound Semiconductor Analogue Microwave Integrated Circuits
Published by RIAC, December 2006.

Reliability of High Temperature Electronics, Second Edition
Published by RIAC, December 2006.

Photonic Materials, Devices and Reliability, Second Edition
Published by RIAC, December 2006.
ISBN-13: 9781933904047

Lectures in: Photonic Materials, Devices and Reliability
Published by Center for Reliability Engineering, 2003.
ISBN 0-9652669-7-4

Introduction to the Physics of Materials
Published by CTRS, Beacon Press, 1999.
ISBN 0-9652669-9-0

Reliability of High Temperature Electronics
Published by CTRS, Printed by Beacon Press, 1996.
ISBN 0-9652669

Reliability of GaAs Monolithic Integrated Circuits
Published by John Wiley and Sons, October 1992; second edition 1995.

Integrating Reliability into Microcircuit Manufacturing
Published by John Wiley, 1994.
ISBN 0-4719440-7-6

Electromigration and Electronic Device Degradation
Aris Christou (Editor)
Published by John Wiley, 1993.
ISBN: 0-471-58489-4

Selected Publications 

For a more extensive list of selected publications, please visit Proessor Christou's web site
For the entire publication list, please see Professor Christou's C.V. (PDF)

T.J. Anderson, K.D. Hobart, J.D. Greenlee, D.I. Shahin, A.D. Koehler, E.A. Imhoff, R.L. Myers-Ward, A. Christou, F.J. Kub, “UV and EUV Detectors Based on the Graphene/SiC Heterojunction”, Submitted to Electronic Letters, 2014.

Gary Paradee, Tom Martin, Aris Christou, “Fatigue Properties of Graphene on Flexible Substrates”, IEEE Transactions on Device and Materials Reliability, December 2014

Gary Paradee, Tom Martin and Aris Christou, “Fatigue Properties of Uniform and Patterned ITO on Flexible Substrates,” J. Microelectronics Reliability, Accepted 2014 and to be published 2015.

Gary Paradee, Eric Bailey and A. Christou, “Stress relaxation behavior and low cycle fatigue behavior of bulk SAC 305,” J. Mater. Sci. Electron (2014) 25:4122-4128.

Gary Paradee, Tom Martin, Aris Christou, “Fatigue Properties of Graphene on Flexible Substrates”, IEEE Transactions on Device and Materials Reliability, December 2014.

A. Christou, “Process-Reliability Relationships in GaN and GaAs Field Effect Transistors and HFETs”, Compound Semiconductor Manufacturing Technology, Digest_2013, pp 391-394.

Kaushik Chatterjee, Mohammad Modarres and Joseph B. Bernstein. "Fifty Years of Physics of Failure" (PDF), Journal of the Reliability Informaiton Analysis Center, January 2012.

M. Sawant, and A. Christou. "Failure modes and effects criticality analysis and accelerated life testing of LEDs for medical applications." Solid-State Electronics, (2012) 78, 39–45.

Martin Peckerar, Thomas Martin, and Aris Christou."Nanoparticle Technology for Power Integration With Flexible Substrates."

Christou, A., & Fantini, F. "Introduction to the special issue on GaN and related nitride compound device reliability." IEEE Transactions on Device and Materials Reliability, (2008) 8(2), 239-239.

Christou, A. "Monte Carlo Reliability Model for Microwave Monolithic Integrated Circuits." Quality and Reliability Engineering International, (2008) 24(3), 315-329.

S. Yang, A. Christou, “Failure Model for Silver Electromigration,” IEEE Trans Materials, Device Reliability, Vol2,  Feb 2007.

S. Yang, J.Wu, A. Christou, “Initial Stages of Silver Electrochemical Migration Degradation,” Microelectronics Reliability vol.46 (2006) 1915-1921.

C.C. Zhang, Aris Christou, “Reliability of Leadless Interconnects in GaAs ASICS”, J. of RIAC, 2006, No.2, 20-26.

Ahangir Alam, Andrei E. Botchkarev, James A. Griffin, John M. Zavada, Aristos Christou and S. Noor Mohammad, “Optical properties of MBE-grown GaAs1-xNx alloys”, Phil Mag, 1121-1134, 2006.

S. J. Chang, C. F. Shen, S. C. Shei, C. S. Chang, W. S. Chen, T. K. Ko, J.K.Shei and Y. S. Sun, "Highly Reliable Nitride-Based LEDs with Internal ESD Protection Diodes" (PDF), IEEE Transactions on Device and Materials Reliability, November 2005.

L.Mohaddes-Ardahilli, L. Martinez-Miranda, L. Salamanca-Riba, A. Christou, William Bentley and M. Al- Sheikhley, “Preferred Orientation of DNA Olionucleotide probes on the (2x4) Reconstructed Surface of (001) GaAs,” J Appl. Physics Vol 95, No. 11, Part 1 (6021-6024), June 2004.

Mohamad Al-Sheikhley, D. Sweet, Lourdes Salamanca-Riba, B. Varughese, J. Silverman, Aris Christou and William Bentley, “Radiation-Induced Failure Mechanisms of GaAs–Based Biochips,” IEEE Transactions on Device and Materials Reliability, vol. 4, No. 2 (192-197), June 2004.

C. Zhang, P. Yalamanchili, M. Al-Sheikhley and A. Christou, Metal Migration in Epoxy Encapsulated ECL Devices, 2004 ESREF, Oct. 2004.

L.Mohaddes-Ardahilli, L. Martinez-Miranda, J. Silverman, A. Christou, L. Salamanca- Riba and M. Al- Sheikhley, “Attachment of DNA Probes on GaAs Surfaces”, Appl. Physics Lettrs, 83, No. 1, pp. 192-194 (2003).

N. Strifas, P. Yalamanchili, A. Christou, “Reliability Model for Polyimide-Metal Interconnect Shorts,” Qual and Reliability Int. 20:1-13 (2004).

M. Linnik and A. Christou, “Calculations of optical properties for Quartenary III-V semiconductor alloys in the transparent region and above” (PDF), Physica B, 318, pp 140-161 (2002). Abstract »

Selected Presentations 

For a more extensive list of selected presentations, please visit Proessor Christou's web site

David Shahin, and A. Christou, “GaN/Si(111) Device Defects and Degradation Mechanisms,” ECS Transactions, 64(7) 203-211 (2014).

Krishna Shenai, Aris Christou, Michael Dudley, Balaji Ragothamachar and Rajendra Singh, “Crystal Defects in Wide Bandgap Semiconductors,” ECS Transactions, 61(4) 283-293 (2014).

A. Christou, Krishna Shenai and  Dimitri Pavlidis, “Crystal Defects in Wide Bandgap Semiconductors and Effects on Device Performance,” Proceedings WOCSDICE, June 2014.

Aris Christou, P. McCuskey and A. Dasgupta, “ Physics of Failure and Reliability of Power Electronics Devices”, p. 1926, Proceedings of 224th ECS Meeting, 2013 The Electrochemical Society.

A. Christou, “GaN MESFETs and HFETs Processing Technology and Reliability Relationships, and Robust Wide-band gap Power Semiconductor Devices”, Micro-Nanotechnology, Digest of Presentations, 2013.

A. Christou and D. Pavlidis, (Keynote Talk) “Control of Surfaces and Interfaces for Enhanced Performance and Reliability of Wide Bandgap Semiconductor Devices” Technical Digest of International Conference on Intergranular and Interphase Boundaries in Materials 2013, Halkidiki Greece, Digest of Presentations.

A. Christou. "GaAs and GaN MESFETs and HFETs Processing Technology and Reliability Relationships, A Review" (PDF) Plenary Lecture. Micro- and Nanoelectronics Conference, October 5th, Heraklio, Crete, Greece. (2012)

M. Sawant and A. Christou,"A Bayes Approach and Criticality Analysis for Reliability Prediction of AlGaInP Light Emitting Diodes" (PDF), Reliability Of Compound Semiconductors Workshop (ROCS 2012), April 23, Boston, Mass. (2012)

Zahra Mohaghegh, Mohammad Modarres and Aris Christou, "Physics-Based Common Cause Failure Modeling in Probabilistic Risk Analysis: A Mechanistic Perspective" (PDF), Proceedings of the ASME 2011 Power Conference, POWER2011, July 12-14, Denver, Colorado, USA (2011)

Martin Peckerar, Thomas Martin and Aris Christou, "Flexible Displays With Nanostructured Integrated Power Sources" (PDF), IC4N 2011, June 26-30, Crete, Greece (2011)

Martin Peckerar, Thomas Martin and Aris Christou, "Nanoparticle Technology for Power Integration With Flexible Substrates" (PDF), Proceedings of the IC4N 2011, June 26-30, Crete, Greece (2011)

M. Sawant and A. Christou, "Failure Modes and Effects Criticality Analysis and Accelerated Life Testing of LEDs for Medical Applications" (PDF), ISDRS 2011, December 7-9, College Park, MD (2011)

S. Salemi and A. Christou, "Charge Control Analysis of Gallium Nitride Semiconductor Heterostructures and Comparison with GaAs HFET Failure Mechanisms" (PDF), WOCSDICE 2008, May 18-21, Leuven, Belgium (2008)

M. Linnick, Chichang Zhang and A. Christou, “Dielectric Constants for AlGaInAs Quartenary Semiconductor Alloys Grown by MBE for VCSEL Bragg Mirror Applications”, in The Physics and Challenges for Integrated Optics Symposium, MS&T 2005, pp. 23-31

M. Al-Sheikhley, A. Christou, “The Limitations of GaAs/DNA Based Bio-Memory and Sensing Device,” WOCSDICE 2005, pp. 143-148, Cardiff, Wales, UK (2005)

A. Christou, “Advances in Engineering Education: Building alliances With Professional Societies”, Proceedings of the International Conference on Engineering Education, ISBN: 1562-3580, July 2005, Gliwice, Poland

Materials Education for the 21st Century Workforce: The 18th Biennial Conference on National Materials Policy. May 24-25, National Academies’ Keck Center, Washington, DC (2004) Dr. Christou chaired the conference–Read his Opening Remarks (PDF)

CC Zhang, P. Yalamanchili, M. Al-Sheikhley and A. Christou, "Metal Migration in Epoxy Encapsulated ECL Devices," 2004, Proceedings ESREF 2004

A. Christou and M. Al-Sheikhley, “Hydridization of DNA on GaAs by VCSEL Source 980nm Photons, MRS 2003 Proceedings Dec 1-3 Boston (2003)

Agis A. Iliadis and A. Christou, "Design and Development of Short and Long Wavelength Infrared Vertical Cavity Surface Emitting Lasers,"(PDF) Invited Paper: 2003 Photonics West, Jan 29-Feb 03, 2003 Paper OE15-29-02

Related News 

MSE Grad Student, David Shahin, Receives Award for Diamond Tech Research
Shahin’s presentation at the MRS Fall 2017 Meeting took second place. December 11, 2017

MSE Professor Aristos Christou Elevated to IEEE 'Life Fellow'
Christou received this honor based on significant accomplishments and advancements to the engineering field. May 2, 2017

Professor Aristos Christou Leads Research of Diamond Electronics
Carbon electronics that are built around graphene will now include diamond. December 1, 2016

MSE Researchers Shahin and Christou Published in Applied Physics Express
David Shahin and Aris Christou collaborate with U.S. Naval Research Lab on high-electron-mobility transistors. July 21, 2016

Shahin Receives CALCE Best Presenter Award
MSE grad student David Shahin named Fall 2015 Electronic Products and Systems Consortium Technical Review Best Student Presenter December 15, 2015

Shahin Among Top 2% of UMD Graduate Assistants
Graduate School honors Ph.D. student with 2015 Outstanding Graduate Assistant Award May 7, 2015

Bailey Awarded NSF Graduate Research Fellowship
Four materials science students receive Honorable Mentions. April 21, 2015

Shahin Wins ASEE Naval Research Internship
NREIP Program selects MSE grad student for summer program. March 12, 2015

Christou Joins Md. Delegation to European Offshore Wind Energy Conference
Professor will present paper on predictive modeling of grid reliability. March 2, 2015

Undergrad Among First to Map Solar Cell Parameters at Sub-Micron Resolution
Bailey receives second SEEDS Fellowship, will conduct work in Leite Lab. November 12, 2014

Workshop on Defects in Wide Band Gap Semiconductors Sept. 23
Abstracts due July 28 July 10, 2014

Offshore Wind Energy and Reliability
Clark School professors support the State of Maryland's efforts to establish a resilient wind farm. May 25, 2014

Exploring Offshore Wind Energy for Maryland
Md. Higher Education Commission funds Clark School study of reliability, cost-effectiveness of wind-generated energy. September 10, 2013

Christou Invited to Discuss Wide Bandgap Semiconductors, Physics-of-Failure
Professor will be featured speaker in summer conferences in Greece. April 22, 2013

Christou Receives IEEE Service Award
Professor recognized for pioneering work on high-impact journal. December 17, 2012

Workshop on Wide Bandgap Power Semiconductors Stresses Need for Commercial Development
Participants from academia, government and industry discuss manufacturing initiative, new consortium to address challenges. December 3, 2012

Christou Organizes Workshop on Wide Bandgap Semiconductors
Event to be held Oct. 23 at Kim Engineering Building. October 17, 2012

Christou to Deliver Keynote at Micro&Nano 2012
Professor will also be recognized for contributions to semiconductor research. September 14, 2012

Christou Tapped for Expert Panel in Condensed Matter Physics
New program will fund research in Greece. January 26, 2012

Christou Appears on "Platts Energy Week"
Professor discusses rise of applicants to nuclear engineering programs. September 7, 2010

NRC Funds Development of New Grad-Level Corrosion Courses
Ankem, Christou, and Moderres to create new modules for nuclear, reliability, and sustainability engineering programs. June 14, 2010

NRC Collaboration Helps Bring Nuclear Engineering Education Online
Nuclear Engineering graduate degrees (M.Eng. and Graduate Certificate) available 100% online. June 15, 2009

Christou Designs Better Lasers for Threat Detection
New lasers are tunable, span longer wavelengths. April 16, 2008

Christou Receives ASM Award
International society recognizes original research, leadership. March 28, 2007

Materials Camp Will Help Teachers Innovate
Sessions seek to improve K-12 education, inspire students. June 22, 2006

Professor Christou hosts the Federation of Materials Societies Award Reception
Prof. Christou outlined the directions to be take by FMS in 2006 January 19, 2006