Photo of Mowafak Al-Jassim

Mowafak Al-Jassim

Contingent Worker-Emeritus Researcher


Mowafak Al-Jassim is a Principal Scientist and Group Manager at NREL. Dr. Al-Jassim has worked at NREL for more than 30 years, beginning as a postdoctoral researcher and advancing to a principal scientist and a technical manager. His research group has contributed greatly to world-record efficiencies in various photovoltaic technologies. Dr. Al-Jassim has more than 500 publications in peer-reviewed journals and conference proceedings, and he has participated in the planning of numerous international conferences.

Research Interests

His research interests include the multiscale characterization of the structural, chemical, interfacial, optical, and electrical properties of bulk and thin-film semiconductors by TEM/STEM, CL, EBIC, AFM, and other techniques. His work has involved developing Si, III-V, and thin-film solar cells.


M.Sc. Materials Science, Imperial College of Science and Technology, London

D.Phil. Materials Science, University of Oxford

Featured Work

Recombination by Grain-Boundary Type in CdTe. Moseley, J.; Metzger, W.K.; Moutinho, H.R.; Paudel, N.; Guthrey, H.L.; Yan, Y.; Ahrenkiel, R.K.; Al-Jassim, M.M. Journal of Applied Physics. 118. 9 pp. 2015.

Suppression of the Cu2-xS Secondary Phases in CZTS Films through Controlling the Film Elemental Composition. Abusnina, M.; Matin, M.; Moutinho, H.R.; Blackburn, J.L.; Alleman, J.; DeHart, C.; To, B.; Al-Jassim, M. IEEE Journal of Photovoltaics. 5. pp. 1470–1475. 2015.

Carrier Separation and Transport in Perovskite Solar Cells Studied by Nanometre-Scale Profiling of Electrical Potential. Jiang, C.-S.; Yang, M.; Zhou, Y.; To, B.; Nanayakkara, S.U.;  Luther, J.M; Zhou, W.; Berry, J.J.; van de Lagemaat, J.; Padture, N.P.; Zhu, K.; Al-Jassim, M.M. Nature Communications. 6. 10 pp. 2015.

Quantitative Determination of Grain-Boundary Recombination Velocity in CdTe by Cathodoluminescence Measurements and Numerical Simulations. Kanevce, A.; Moseley, J.; Al-Jassim, M.; Metzger, W.K. IEEE Journal of Photovoltaics. 5. pp. 1722–1726. 2015.

Mechanisms of Electron Beam-Induced Damage in Perovskite Thin Films Revealed by Cathodoluminescence Spectroscopy. Xiao, C.; Li, Z.; Guthrey, H.; Moseley, J.; Yang, Y.; Wozny, S.; Moutinho, H.; To, B.; Berry, J.J.; Gorman, B.; Yan, Y.; Zhu, K.; Al-Jassim, M. Journal of Physical Chemistry C. 119. pp. 26904–26911. 2015.

3-D Point Defect Density Distributions in Thin Film Cu(In,Ga)Se2 Measured by Atom Probe Tomography. Stokes, A.; Al-Jassim, M.; Dierks, D.R.; Egaas, B.; Gorman, B. Acta Materialia. 102. pp. 32–37. 2016.

CdTe Solar Cells with Open-Circuit Voltage Breaking the 1 V Barrier. Burst, J.M.; Duenow, J.N.; Albin, D.S.; Colegrove, E.; Reese, M.O.; Aguiar, J.A.; Jiang, C.S.; Patel, M.K.; Al-Jassim, M.M.; Kuciauskas, D.; Swain, S.; Ablekim, T.; Lynn, K.G.; Metzger, W.K. Nature Energy. 1. 7 pp. 2016.

Revealing Surface Modifications of Potassium-Fluoride Treated Cu(In,Ga)Se2: A Study of Material Structure, Chemistry, and Photovoltaic Performance. Aguiar, J.A.; Stokes, A.; Jiang, C.-S.; Aoki, T.; Kotula, P.G.; Patel, M.K.; Gorman, B.; Al-Jassim, M. Advanced Materials Interfaces. 3. 7 pp. 2016.

Three-Dimensional Minority-Carrier Collection Channels at Shunt Locations in Silicon Solar Cells. Guthrey, H.; Johnston, S.; Weiss, D.N.; Grover, S.; Jones, K.; Blosse, A.; Al-Jassim, M. Solar Energy. 135. pp. 163–168. 2016.