Silvija Gradečak

  • Visiting Professor in Materials Science and Engineering
  • Diploma in Physics, University of Zagreb (Zagreb, Croatia), 1999
  • PhD in Physics, Interdisciplinary Center of Electron Microscopy, Swiss Federal Institute of Technology (Lausanne, Switzerland), 2003

Electronic Materials; Photonic Materials

Silvija Gradečak

Research

Prof. Gradečak's research focuses on nano-photonics and electronics and is based on the synthesis, characterization and integration of low-dimensional systems. By taking the advantage of unique material properties on a nanoscale, she explores novel optoelectronic applications such as nanoscale light-emitting sources, single photon sources, or nanowire lasers.

Understanding the properties of such nanosystems requires multidisciplinary approach and new instrumental tools. Prof. Gradečak uses rational synthesis of free-standing nanoscale objects like nanocrystals, nanotubes, and nanowires and combine spectroscopic techniques, transport measurements and advanced electron microscopy techniques to directly correlate structural and physical properties on the nanometer scale. Experimental techniques and methodologies that are being developed as a part of her research endeavor are generally applicable to any material system where interplay between nanostructure, properties, and performance becomes significant.

Recent News

2018 Materials Day

November 28, 2018

Materials Day Symposium and Poster Session
October 10, 2018
Kresge Auditorium This year’s annual MIT MRL Materials Day Symposium will be held on Wednesday, Oct. 10, 2018, in Kresge Auditorium from 8:30 a.m. to 3:30 p.m. The symposium will focus on imaging-…  

2017 Faculty Promotions

May 15, 2017

Several DMSE faculty promotions will be taking effect starting July 1, 2017.  Congratulations to: Polina Anikeeva, Antoine Allanore, Niels Holten-Andersen, and Silvija Gradecak for their promotions this year! …  

New observations of semiconductor properties

May 23, 2013

A significant controversy surrounds the reason for the high-intensity light output from a leading LED semiconductor material, indium gallium nitride (InGaN): Researchers have been split on whether or not indium-rich clusters form within the material and provide the LED’s remarkable efficiency.…  

Nanowires and Nanotubes

April 10, 2013

Professor Silvija Gradečak and her colleagues are finding new uses for nanubes and nanowires, including use in energy, electronics, optics, and other fields.  See the…  

Solar-cell design using nano wires

March 24, 2013

Professor Silvija Gradečak is part of a team of MIT researchers who are working to improve efficiency of quantum-dot photovoltaic system by adding a forest of nanowires. Learn more from the …  

More news about Silvija Gradečak >>

Publications

2018

A. Kadir et al., “Influence of substrate nitridation on the threading dislocation density of GaN grown on 200 mm Si (111) substrate”, Thin Solid Films, vol. 663. pp. 73-78, 2018.
J. J. Cheng, Chuang, C. -H. M., Hentz, O., Rekemeyer, P. H., Bawendi, M. G., and Gradecak, S., “Dimension- and Surface-Tailored ZnO Nanowires Enhance Charge Collection in Quantum Dot Photovoltaic Devices”, ACS Applied Energy Materials, vol. 1. pp. 1815-1822, 2018.
O. Hentz, Rekemeyer, P., and Gradecak, S., “Effects of Voltage Biasing on Current Extraction in Perovskite Solar Cells”, Advanced Energy Materials, vol. 8. p. 1701378, 2018.
J. P. Hanson et al., “Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725”, Nature Communications, vol. 9. 2018.
K. Bogaert et al., “Two-Dimensional MoxW1−xS2 Graded Alloys: Growth and Optical Properties”, Scientific Reports, vol. 8. 2018.
O. D. Hentz, Cheng, J. J., Rekemeyer, P. H., Andrejevic, N., and Gradecak, S., Nanowire-Based Bulk Heterojunction Solar Cells, vol. 98. Elsevier, 2018, pp. 479-527.

2017

P. H. Rekemeyer, Chuang, C. -H. M., Bawendi, M. G., and Gradecak, S., “Minority Carrier Transport in Lead Sulfide Quantum Dot Photovoltaics”, Nano Letters, vol. 17. pp. 6221-6227, 2017.
O. Hentz, Zhao, Z., and Gradecak, S., “Direct correlation between local stoichiometry and optoelectronic properties in CH3NH3PbI3 films”, in 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC), Washington, DC, 2017, pp. 1-3.
X. Wang, Ermez, S., Goktas, H., Gradecak, S., and Gleason, K., “Room Temperature Sensing Achieved by GaAs Nanowires and oCVD Polymer Coating”, Macromolecular Rapid Communications, vol. 38. p. 1700055, 2017.

2016

P. H. Rekemeyer, Chang, S., Chuang, C. -H. M., Hwang, G. W., Bawendi, M. G., and Gradecak, S., “Enhanced Photocurrent in PbS Quantum Dot Photovoltaics via ZnO Nanowires and Band Alignment Engineering”, Advanced Energy Materials, vol. 6. p. 1600848, 2016.
Y. Song, Chang, S., Gradecak, S., and Kong, J., “Visibly-Transparent Organic Solar Cells on Flexible Substrates with All-Graphene Electrodes”, Advanced Energy Materials, vol. 6. p. 1600847, 2016.
V. Steinmann et al., “A Two-Step Absorber Deposition Approach To Overcome Shunt Losses in Thin-Film Solar Cells: Using Tin Sulfide as a Proof-of-Concept Material System”, Acs Applied Materials & Interfaces, vol. 8. pp. 22664-22670, 2016.
W. J. Jo et al., “Oxidative Chemical Vapor Deposition of Neutral Hole Transporting Polymer for Enhanced Solar Cell Efficiency and Lifetime”, Advanced Materials, vol. 28. p. 6399 - +, 2016.
K. Bogaert, Liu, S., Chesin, J., Titow, D., Gradecak, S., and Garaj, S., “Diffusion-Mediated Synthesis of MoS2/WS2 Lateral Heterostructures”, Nano Letters, vol. 16. pp. 5129-5134, 2016.
S. Chang et al., “Transition Metal-Oxide Free Perovskite Solar Cells Enabled by a New Organic Charge Transport Layer”, Acs Applied Materials & Interfaces, vol. 8. pp. 8511-8519, 2016.
O. Hentz, Zhao, Z., and Gradecak, S., “Impacts of Ion Segregation on Local Optical Properties in Mixed Halide Perovskite Films”, Nano Letters, vol. 16. pp. 1485-1490, 2016.
M. -Y. Lu et al., “Plasmonic enhancement of Au nanoparticle-embedded single-crystalline ZnO nanowire dye-sensitized solar cells”, Nano Energy, vol. 20. pp. 264-271, 2016.
G. Bertoni et al., “Nanoscale mapping of plasmon and exciton in ZnO tetrapods coupled with Au nanoparticles”, Scientific Reports, vol. 6. p. 19168, 2016.
J. J. Cheng, Nicaise, S. M., Berggren, K. K., and Gradecak, S., “Dimensional Tailoring of Hydrothermally Grown Zinc Oxide Nanowire Arrays”, Nano Letters, vol. 16. pp. 753-759, 2016.
S. Joglekar, Azize, M., Jones, E. J., Piedra, D., Gradecak, S., and Palacios, T., “Impact of Al2O3 Passivation on AlGaN/GaN Nanoribbon High-Electron-Mobility Transistors”, Ieee Transactions on Electron Devices, vol. 63. pp. 318-325, 2016.
R. Chakraborty et al., “Improvement of minority-carrier lifetime in tin monosulfide via substrate engineering”, in 2016 Ieee 43rd Photovoltaic Specialists Conference (pvsc), New York: Ieee, 2016, pp. 415-418.
O. Hentz, Zhao, Z., and Gradecak, S., “Direct Correlation between Local Stoichiometry and Optoelectronic Properties in CH3NH3PbI3 Films”, in 2016 Ieee 43rd Photovoltaic Specialists Conference (pvsc), New York: Ieee, 2016, pp. 3661-3663.

2015

E. J. Jones, Ermez, S., and Gradecak, S., “Mapping of Strain Fields in GaAs/GaAsP Core-Shell Nanowires with Nanometer Resolution”, Nano Letters, vol. 15. pp. 7873-7879, 2015.
S. C. Crawford, Ermez, S., Haberfehlner, G., Jones, E. J., and Gradecak, S., “Impact of nucleation conditions on diameter modulation of GaAs nanowires”, Nanotechnology, vol. 26. p. 225604, 2015.
S. Ermez, Jones, E. J., Crawford, S. C., and Gradecak, S., “Self-Seeded Growth of GaAs Nanowires by Metal-Organic Chemical Vapor Deposition”, Crystal Growth & Design, vol. 15. pp. 2768-2774, 2015.
X. Zhou, Lu, M. -Y., Lu, Y. -J., Jones, E. J., Gwo, S., and Gradecak, S., “Nanoscale Optical Properties of Indium Gallium Nitride/Gallium Nitride Nanodisk-in-Rod Heterostructures”, Acs Nano, vol. 9. pp. 2868-2875, 2015.
S. M. Nicaise, Cheng, J. J., Kiani, A., Gradecak, S., and Berggren, K. K., “Control of zinc oxide nanowire array properties with electron-beam lithography templating for photovoltaic applications”, Nanotechnology, vol. 26. p. 075303, 2015.
M. Seita, Hanson, J. P., Gradecak, S., and Demkowicz, M. J., “The dual role of coherent twin boundaries in hydrogen embrittlement”, Nature Communications, vol. 6. 2015.

2014

S. Chang, Park, H., Cheng, J. J., Rekemeyer, P. H., and Gradecak, S., “Improved efficiency in organic/inorganic hybrid solar cells by interfacial modification of ZnO nanowires with small molecules”, Journal of Physics D-Applied Physics, vol. 47. 2014.
H. Park, Chang, S., Zhou, X., Kong, J., Palacios, T., and Gradecak, S., “Flexible Graphene Electrode-Based Organic Photovoltaics with Record-High Efficiency”, Nano Letters, vol. 14. pp. 5148-5154, 2014.
J. M. Warrender, Mathews, J., Recht, D., Smith, M., Gradecak, S., and Aziz, M. J., “Morphological stability during solidification of silicon incorporating metallic impurities”, Journal of Applied Physics, vol. 115. 2014.
J. Chesin and Gradecak, S., “Comparing directed efficiency of III- nitride nanowire light-emitting diodes”, Journal of Nanophotonics, vol. 8. 2014.
M. -Y. Lu, Zhou, X., Chiu, C. -Y., Crawford, S., and Gradecak, S., “From GaN to ZnGa2O4 through a Low-Temperature Process: Nanotube and Heterostructure Arrays”, Acs Applied Materials & Interfaces, vol. 6. pp. 882-887, 2014.

2013

E. Jones et al., “Towards rapid nanoscale measurement of strain in III-nitride heterostructures”, Applied Physics Letters, vol. 103. 2013.
C. Jagadish, Geelhaar, L., and Gradecak, S., “Semiconductor Nanowires”, Physica Status Solidi-Rapid Research Letters, vol. 7. pp. 683-684, 2013.
A. Gumennik et al., “Silicon-in-silica spheres via axial thermal gradient in-fibre capillary instabilities”, Nature Communications, vol. 4. 2013.
X. Zhou, Lu, M. -Y., Lu, Y. -J., Gwo, S., and Gradecak, S., “Correlation of doping, structure, and carrier dynamics in a single GaN nanorod”, Applied Physics Letters, vol. 102. 2013.
G. Haberfehlner et al., “Selenium Segregation in Femtosecond-Laser Hyperdoped Silicon Revealed by Electron Tomography”, Microscopy and Microanalysis, vol. 19. pp. 716-725, 2013.
J. Jean et al., “ZnO Nanowire Arrays for Enhanced Photocurrent in PbS Quantum Dot Solar Cells”, Advanced Materials, vol. 25. pp. 2790-2796, 2013.
K. H. Baloch, Johnston-Peck, A. C., Kisslinger, K., Stach, E. A., and Gradecak, S., “Revisiting the "In-clustering" question in InGaN through the use of aberration-corrected electron microscopy below the knock-on threshold”, Applied Physics Letters, vol. 102. 2013.
L. Hu, Brewster, M. M., Xu, X., Tang, C., Gradecak, S., and Fang, X., “Heteroepitaxial Growth of GaP/ZnS Nanocable with Superior Optoelectronic Response”, Nano Letters, vol. 13. pp. 1941-1947, 2013.
H. Park, Chang, S., Smith, M., Gradecak, S., and Kong, J., “Interface engineering of graphene for universal applications as both anode and cathode in organic photovoltaics”, Scientific Reports, vol. 3. 2013.
M. J. Smith, Sher, M. -J., Franta, B., Lin, Y. -T., Mazur, E., and Gradecak, S., “Response to "Comment on "The origins of pressure-induced phase transitions during the surface texturing of silicon using femtosecond laser irradiation"" [J. Appl. Phys. 113, 126102 (2013)]”, Journal of Applied Physics, vol. 113. 2013.
S. K. Lim, Crawford, S., Haberfehlner, G., and Gradecak, S., “Controlled Modulation of Diameter and Composition along Individual III-V Nitride Nanowires”, Nano Letters, vol. 13. pp. 331-336, 2013.
F. Fabbri, Smith, M. J., Recht, D., Aziz, M. J., Gradecak, S., and Salviati, G., “Depth-resolved cathodoluminescence spectroscopy of silicon supersaturated with sulfur”, Applied Physics Letters, vol. 102. 2013.
S. Crawford, Lim, S. K., and Gradecak, S., “Fundamental Insights into Nanowire Diameter Modulation and the Liquid/Solid Interface”, Nano Letters, vol. 13. pp. 226-232, 2013.
H. Park et al., “Graphene Cathode-Based ZnO Nanowire Hybrid Solar Cells”, Nano Letters, vol. 13. pp. 233-239, 2013.
M. de la Mata et al., “A review of MBE grown 0D, 1D and 2D quantum structures in a nanowire”, Journal of Materials Chemistry C, vol. 1. pp. 4300-4312, 2013.

2012

M. J. Smith, Sher, M. -J., Franta, B., Lin, Y. -T., Mazur, E., and Gradecak, S., “The origins of pressure-induced phase transformations during the surface texturing of silicon using femtosecond laser irradiation”, Journal of Applied Physics, vol. 112. 2012.
E. J. Jones, Azize, M., Smith, M. J., Palacios, T., and Gradecak, S., “Correlating stress generation and sheet resistance in InAlN/GaN nanoribbon high electron mobility transistors”, Applied Physics Letters, vol. 101. 2012.
S. Gradecak, “Semiconductor nanowires for energy applications”, Abstracts of Papers of the American Chemical Society, vol. 244. 2012.
X. Zhou, Chesin, J., Crawford, S., and Gradecak, S., “Using seed particle composition to control structural and optical properties of GaN nanowires”, Nanotechnology, vol. 23. 2012.
F. Qian et al., “Controlled Synthesis of AlN/GaN Multiple Quantum Well Nanowire Structures and Their Optical Properties”, Nano Letters, vol. 12. pp. 3344-3350, 2012.
M. T. Winkler et al., “Studying femtosecond-laser hyperdoping by controlling surface morphology”, Journal of Applied Physics, vol. 111. 2012.
M. M. Brewster, Zhou, X., Lu, M. -Y., and Gradecak, S., “The interplay of structural and optical properties in individual ZnO nanostructures”, Nanoscale, vol. 4. pp. 1455-1462, 2012.
J. Chesin, Zhou, X., and Gradecak, S., “Light extraction in individual GaN nanowires on Si for LEDs”, Nanoepitaxy: Materials and Devices Iv, vol. 8467. 2012.

2011

S. Ren, Bernardi, M., Lunt, R. R., Bulovic, V., Grossman, J. C., and Gradecak, S., “Toward Efficient Carbon Nanotube/P3HT Solar Cells: Active Layer Morphology, Electrical, and Optical Properties”, Nano Letters, vol. 11. pp. 5316-5321, 2011.
M. J. Smith, Winkler, M., Sher, M. -J., Lin, Y. -T., Mazur, E., and Gradecak, S., “The effects of a thin film dopant precursor on the structure and properties of femtosecond-laser irradiated silicon”, Applied Physics a-Materials Science & Processing, vol. 105. pp. 795-800, 2011.
M. Azize et al., “High-Electron-Mobility Transistors Based on InAlN/GaN Nanoribbons”, Ieee Electron Device Letters, vol. 32. pp. 1680-1682, 2011.
M. J. Smith, Lin, Y. -T., Sher, M. -J., Winkler, M. T., Mazur, E., and Gradecak, S., “Pressure-induced phase transformations during femtosecond-laser doping of silicon”, Journal of Applied Physics, vol. 110. 2011.
S. Ren et al., “Inorganic-Organic Hybrid Solar Cell: Bridging Quantum Dots to Conjugated Polymer Nanowires”, Nano Letters, vol. 11. pp. 3998-4002, 2011.
M. M. Brewster, Lu, M. -Y., Lim, S. K., Smith, M. J., Zhou, X., and Gradecak, S., “The Growth and Optical Properties of ZnO Nanowalls”, Journal of Physical Chemistry Letters, vol. 2. pp. 1940-1945, 2011.
M. M. Brewster, Zhou, X., Lim, S. K., and Gradecak, S., “Role of Au in the Growth and Nanoscale Optical Properties of ZnO Nanowires”, Journal of Physical Chemistry Letters, vol. 2. pp. 586-591, 2011.
S. Ren, Zhao, N., Crawford, S. C., Tambe, M., Bulovic, V., and Gradecak, S., “Heterojunction Photovoltaics Using GaAs Nanowires and Conjugated Polymers”, Nano Letters, vol. 11. pp. 408-413, 2011.

2010

M. J. Tambe, Ren, S., and Gradecak, S., “Effects of Gold Diffusion on n-Type Doping of GaAs Nanowires”, Nano Letters, vol. 10. pp. 4584-4589, 2010.
S. K. Lim, Crawford, S., and Gradecak, S., “Growth mechanism of GaN nanowires: preferred nucleation site and effect of hydrogen”, Nanotechnology, vol. 21. 2010.
C. -H. Tseng, Tambe, M. J., Lim, S. K., Smith, M. J., and Gradecak, S., “Position controlled nanowire growth through Au nanoparticles synthesized by galvanic reaction”, Nanotechnology, vol. 21. 2010.
M. J. Tambe, Allard, L. F., and Gradecak, S., “Characterization of core-shell GaAs/AlGaAs nanowire heterostructures using advanced electron microscopy”, in 16th International Conference on Microscopy of Semiconducting Materials, vol. 209, 2010.
S. Ren, Lim, S. -K., and Gradecak, S., “Synthesis and thermal responsiveness of self-assembled gold nanoclusters”, Chemical Communications, vol. 46. pp. 6246-6248, 2010.

2009

S. K. Lim, Brewster, M. M., Qian, F., Li, Y., Lieber, C. M., and Gradecak, S., “Direct Correlation between Structural and Optical Properties of III-V Nitride Nanowire Heterostructures with Nanoscale Resolution”, Nano Letters, vol. 9. pp. 3940-3944, 2009.
M. M. Brewster, Schimek, O., Reich, S., and Gradecak, S., “Exciton-phonon coupling in individual GaAs nanowires studied using resonant Raman spectroscopy”, Physical Review B, vol. 80. 2009.
X. Fang, Bando, Y., Gautam, U. K., Zhai, T., Gradecak, S., and Golberg, D., “Heterostructures and superlattices in one-dimensional nanoscale semiconductors”, Journal of Materials Chemistry, vol. 19. pp. 5683-5689, 2009.

2008

M. J. Tambe, Lim, S. K., Smith, M. J., Allard, L. F., and Gradecak, S., “Realization of defect-free epitaxial core-shell GaAs/AlGaAs nanowire heterostructures”, Applied Physics Letters, vol. 93. 2008.
F. Qian et al., “Multi-quantum-well nanowire heterostructures for wavelength-controlled lasers”, Nature Materials, vol. 7. pp. 701-706, 2008.
S. K. Lim, Tambe, M. J., Brewster, M. M., and Gradecak, S., “Controlled growth of ternary alloy nanowires using metalorganic chemical vapor deposition”, Nano Letters, vol. 8. pp. 1386-1392, 2008.

2006

F. Qian, Li, Y., Gradecak, S., and Lieber, C. M., “INOR 63-Nanowire heterostructures as high-efficiency, multicolor light-emitting diodes”, Abstracts of Papers of the American Chemical Society, vol. 232. 2006.
Y. Li et al., “Dopant-free GaN/AlN/AlGaN radial nanowire heterostructures as high electron mobility transistors”, Nano Letters, vol. 6. pp. 1468-1473, 2006.
Y. Li et al., “Nanowire radial heterostructures as high electron mobility transistors”, Abstracts of Papers of the American Chemical Society, vol. 231. 2006.

2005

F. Qian, Gradecak, S., Li, Y., Wen, C. Y., and Lieber, C. M., “Core/multishell nanowire heterostructures as multicolor, high-efficiency light-emitting diodes”, Nano Letters, vol. 5. pp. 2287-2291, 2005.
S. Gradecak, Qian, F., Li, Y., Park, H. G., and Lieber, C. M., “GaN nanowire lasers with low lasing thresholds”, Applied Physics Letters, vol. 87. 2005.
P. V. Radovanovic, Barrelet, C. J., Gradecak, S., Qian, F., and Lieber, C. M., “General synthesis and properties of manganese-doped II-VI and III-V diluted magnetic semiconductor nanowires”, Abstracts of Papers of the American Chemical Society, vol. 230. pp. U2042 - U2043, 2005.
D. C. Bell, Barrelet, C. J., Gradecak, S., and Lieber, C. M., “Nanowire characterization for photonic properties.”, Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada, vol. 11 Suppl 2. pp. 1968-9, 2005.
P. V. Radovanovic, Barrelet, C. J., Gradecak, S., Qian, F., and Lieber, C. M., “General synthesis of manganese-doped II-VI and III-V semiconductor nanowires”, Nano Letters, vol. 5. pp. 1407-1411, 2005.
J. Dorsaz, Carlin, J. F., Gradecak, S., and Ilegems, M., “Progress in AlInN-GaN Bragg reflectors: Application to a microcavity light emitting diode”, Journal of Applied Physics, vol. 97. 2005.
B. Lukic et al., “Elastic modulus of multi-walled carbon nanotubes produced by catalytic chemical vapour deposition”, Applied Physics a-Materials Science & Processing, vol. 80. pp. 695-700, 2005.

2004

S. Gradecak, Stadelmann, P., Wagner, V., and Ilegems, M., “Bending of dislocations in GaN during epitaxial lateral overgrowth”, Applied Physics Letters, vol. 85. pp. 4648-4650, 2004.
F. Qian, Li, Y., Gradecak, S., Wang, D. L., Barrelet, C. J., and Lieber, C. M., “Gallium nitride-based nanowire radial heterostructures for nanophotonics”, Nano Letters, vol. 4. pp. 1975-1979, 2004.
J. Dorsaz, Carlin, J. F., Zellweger, C. M., Gradecak, S., and Ilegems, M., “InGaN/GaN resonant-cavity LED including an AlInN/GaN bragg mirror”, Physica Status Solidi a-Applied Research, vol. 201. pp. 2675-2678, 2004.
D. C. Bell et al., “Imaging and analysis of nanowires”, Microscopy Research and Technique, vol. 64. pp. 373-389, 2004.
J. F. Carlin, Dorsaz, J., Zellweger, C. M., Gradecak, S., and Ilegems, M., AlInN as high-index-contrast material for GaN-based optoelectronics. 2004.
J. Napierala, Martin, D., Buhlmann, H. J., Gradecak, S., and Ilegems, M., “GaN laterally overgrown on sapphire by low pressure hydride vapor phase epitaxy”, in Silicon Carbide and Related Materials 2003, Prts 1 and 2, vol. 457-460, 2004, pp. 1581-1584.

2003

S. Gradecak et al., “Microstructure and optical properties of ELO-GaN layers grown by hydride vapor phase epitaxy”, in Microscopy of Semiconducting Materials 2003, 2003, pp. 321-324.

2002

A. Smontara et al., “Thermal and elastic properties of hard carbon”, Strojarstvo, vol. 44. pp. 195-200, 2002.
V. Wagner et al., “Influence of the carrier gas composition on morphology, dislocations, and microscopic luminescence properties of selectively grown GaN by hydride vapor phase epitaxy”, Journal of Applied Physics, vol. 92. pp. 1307-1316, 2002.
J. C. Lasjaunias et al., “Acoustic and thermal transport properties of hard carbon formed from C-60 fullerene”, Physical Review B, vol. 66. 2002.
G. Zgrablic et al., “Instrumental recording of electrophonic sounds from Leonid fireballs”, Journal of Geophysical Research-Space Physics, vol. 107. 2002.
S. Gradecak, Wagner, V., Ilegems, M., Riemann, T., Christen, J., and Stadelmann, P., “Microscopic evidence of point defect incorporation in laterally overgrown GaN”, Applied Physics Letters, vol. 80. pp. 2866-2868, 2002.
A. Smontara, Tonejc, A. M., Gradecak, S., Tonejc, A., Bilusic, A., and Lasjaunias, J. C., “Structural (XRD and HRTEM) investigations of fullerite C-60 and C-70 samples”, Materials Science & Engineering C-Biomimetic and Supramolecular Systems, vol. 19. pp. 21-25, 2002.
S. Gradecak, Volker, V., Ilegems, M., Bobard, F., and Stadelmann, P., “Microstructure of ELO-GaN layers grown by hydride vapor phase epitaxy”, in Gan and Related Alloys-2001, vol. 693, 2002, pp. 123-128.

2001

A. Bilusic, Gradecak, S., Tonejc, A., Tonejc, A. T., Lasjaunias, J. C., and Smontara, A., “Transport properties of fullerite samples”, Synthetic Metals, vol. 121. pp. 1121-1122, 2001.