Photographer: onbekend

prof. dr. T. (Tom) Gregorkiewicz


  • Faculty of Science
    Van der Waals-Zeeman Instituut
  • Visiting address
    Science Park A
    Science Park 904  Room number: C4.233
  • Postal address:
    Postbus  94485
    1090 GL  Amsterdam
  • T.Gregorkiewicz@uva.nl
    T: 0205255643

Vacancies

We welcome highly motivated students who would like to participate in cutting-edge research in the field of nanomaterials. We have constantly new openings for bachelor and master projects - contact us directly for the current opportunities.

2018

  • de Boer, W. D. A. M., Hirtz, J. J., Capretti, A., Gregorkiewicz, T., Izquierdo-Serra, M., Han, S., ... Yuste, R. (2018). Neuronal photoactivation through second-harmonic near-infrared absorption by gold nanoparticles. Light: Science and Applications, 7(1), [100]. DOI: 10.1038/s41377-018-0103-0 
  • de Weerd, C., Gomez, L., Capretti, A., Lebrun, D. M., Matsubara, E., Lin, J., ... Gregorkiewicz, T. (2018). Efficient carrier multiplication in CsPbI3 perovskite nanocrystals. Nature Communications, 9(1), [4199]. DOI: 10.1038/s41467-018-06721-0 
  • de Weerd, C., Gregorkiewicz, T., & Gomez, L. (2018). All-Inorganic Perovskite Nanocrystals: Microscopy Insights in Structure and Optical Properties. Advanced Optical Materials, 6(16), [1800289]. DOI: 10.1002/adom.201800289 
  • Chung, N. X., Limpens, R., De Weerd, C., Lesage, A., Fujii, M., & Gregorkiewicz, T. (2018). Toward Practical Carrier Multiplication: Donor/Acceptor Codoped Si Nanocrystals in SiO2. ACS Photonics, 5(7), 2843-2849. DOI: 10.1021/acsphotonics.8b00144 
  • Lesage, A., Timmerman, D., Lebrun, D. M., Fujiwara, Y., & Gregorkiewicz, T. (2018). Hot-carrier-mediated impact excitation of Er3+ ions in SiO2 sensitized by Si Nanocrystals. Applied Physics Letters, 113(3), [031109]. DOI: 10.1063/1.5042013 
  • Mitchell, B., Herrmann, E., Lin, J., Gomez, L., De Weerd, C., Fujiwara, Y., ... Gregorkiewicz, T. (2018). Measuring the practical particle-in-a-box: Orthorhombic perovskite nanocrystals. European Journal of Physics, 39(5), [055501]. DOI: 10.1088/1361-6404/aac808 
  • Nestoklon, M. O., Goupalov, S. V., Dzhioev, R. I., Ken, O. S., Korenev, V. L., Kusrayev, Y. G., ... Yassievich, I. N. (2018). Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystals. Physical Review B, 97(23), [235304]. DOI: 10.1103/PhysRevB.97.235304 
  • Takatsu, J., Fuji, R., Tatebayashi, J., Timmerman, D., Lesage, A., Gregorkiewicz, T., & Fujiwara, Y. (2018). Growth and optical characteristics of Tm-doped AlGaN layer grown by organometallic vapor phase epitaxy. Journal of Applied Physics, 123(16), [161406]. DOI: 10.1063/1.5011303 
  • Mitchell, B., Dierolf, V., Gregorkiewicz, T., & Fujiwara, Y. (2018). Perspective: Toward efficient GaN-based red light emitting diodes using europium doping. Journal of Applied Physics, 123(16), [160901]. DOI: 10.1063/1.5010762 
  • Limpens, R., Fujii, M., Neale, N. R., & Gregorkiewicz, T. (2018). Negligible Electronic Interaction between Photoexcited Electron-Hole Pairs and Free Electrons in Phosphorus-Boron Co-Doped Silicon Nanocrystals. Journal of Physical Chemistry C, 122(11), 6397-6404. DOI: 10.1021/acs.jpcc.7b12313 
  • Zhu, W., Wei, R., Timmerman, D., Gregorkiewicz, T., Mitchell, B., Fujiwara, Y., & Dierolf, V. (2018). Re-Excitation of Trivalent Europium Ions Doped into Gallium Nitride Revealed through Photoluminescence under Pulsed Laser Excitation. ACS Photonics, 5(3), 875-880. DOI: 10.1021/acsphotonics.7b01090 
  • Gomez, L., Lin, J., De Weerd, C., Poirier, L., Boehme, S. C., Von Hauff, E., ... Gregorkiewicz, T. (2018). Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals. ACS Applied Materials and Interfaces, 10(6), 5984-5991. DOI: 10.1021/acsami.7b17432 
  • de Jong, E. M. L. D., Rutjes, H., Valenta, J., Trinh, M. T., Poddubny, A. N., Yassievich, I. N., ... Gregorkiewicz, T. (2018). Thermally stimulated exciton emission in Si nanocrystals. Light: Science & Applications, 7, [17133]. DOI: 10.1038/lsa.2017.133  [details] 

2017

2016

2015

2014

2013

  • Dohnalova, K., Saeed, S., Poddubny, A. N., Prokofiev, A. A., & Gregorkiewicz, T. (2013). Thermally activated emission from direct bandgap-like silicon quantum dots. ECS J.Solid State Science Technology, 2(6), R97-R99. DOI: 10.1149/2.004306jss  [details] 
  • Dohnalová, K., Poddubny, A. N., Prokofiev, A. A., de Boer, W. D. A. M., Umesh, C. P., Paulusse, J. M. J., ... Gregorkiewicz, T. (2013). Surface brightens-up Si quantum dots: direct bandgap-like size-tunable emission. Light: Science & Applications, 2, e47. DOI: 10.1038/lsa.2013.3  [details] 
  • Limpens, R., & Gregorkiewicz, T. (2013). Spectroscopic investigations of dark Si nanocrystals in SiO2 and their role in external quantum efficiency quenching". Journal of Applied Physics, 114(7), 074304. DOI: 10.1063/1.4818580  [details] 
  • Trinh, M. T., Limpens, R., & Gregorkiewicz, T. (2013). Experimental investigation and modeling of Auger recombination in silicon nanocrystals. The Journal of Physical Chemistry. C, 117(11), 5963-5968. DOI: 10.1021/jp311124c  [details] 
  • de Boer, W. D. A. M., de Jong, E. M. L. D., Timmerman, D., Gregorkiewicz, T., Zhang, H., Buma, W. J., ... Yassievich, I. N. (2013). Carrier dynamics in Si nanocrystals in an SiO2 matrix investigated by transient light absorption. Physical Review B, 88(15), [155304]. DOI: 10.1103/PhysRevB.88.155304  [details] 
  • Doğan, I., Kramer, N. J., Westermann, R. H. J., Dohnalová, K., Smets, A. H. M., Verheijen, M. A., ... Sanden, M. C. M. (2013). Ultrahigh throughput plasma processing of free standing silicon nanocrystals with lognormal size distribution. Journal of Applied Physics, 113(13), 134306. DOI: 10.1063/1.4799402  [details] 
  • Svreck, V., Dohnalova, K., Mariotti, D., Trinh, M. T., Limpens, R., Mitra, S., ... Kond, M. (2013). Dramatic Enhancement of Photoluminescence Quantum Yields for Surface-Engineered Si Nanocrystals within the Solar Spectrum. Advanced Functional Materials, 23(48), 6051-6058. DOI: 10.1002/adfm.201301468  [details] 

2012

  • Dohnalová, K., Fučiková, A., Umesh, C. P., Humpoličková, J., Paulusse, J. M. J., Valenta, J., ... Gregorkiewicz, T. (2012). Microscopic origin of the fast blue-green luminescence of chemically synthesized non-oxidized silicon quantum dots. Small, 8(20), 3185-3191. DOI: 10.1002/smll.201200477  [details] 
  • Timmerman, D., & Gregorkiewicz, T. (2012). Power-dependent spectral shift of photoluminescence from ensembles of silicon nanocrystals. Nanoscale Research Letters, 7, 389. DOI: 10.1186/1556-276X-7-389  [details] 
  • Timmerman, D., Saeed, S., Gregorkiewicz, T., Roldán Gutiérrez, M. A., & Molina, S. I. (2012). Investigation of saturation and excitation behavior of 1.5 μm emission from Er3+ ions in SiO2 sensitized with Si nanocrystals. Physica Status Solidi, C(9), 2312-2317. DOI: 10.1002/pssc.201200311  [details] 
  • Trinh, M. T., Limpens, R., de Boer, W. D. A. M., Schins, J. M., Siebbeles, L. D. A., & Gregorkiewicz, T. (2012). Direct generation of multiple excitons in adjacent silicon nanocrystals revealed by induced absorption. Nature Photonics, 6, 316-320. DOI: 10.1038/NPHOTON.2012.36  [details] 
  • de Boer, W. D. A. M., Timmerman, D., Roldán Gutiérrez, M. A., Molina, S. I., & Gregorkiewicz, T. (2012). Photoluminescence excitation spectroscopy of Si nanocrystals in SiO2. ECS Transactions, 45(5), 3-8. DOI: 10.1149/1.3700404  [details] 
  • de Boer, W. D. A. M., Timmerman, D., Gregorkiewicz, T., Zhang, H., Buma, W. J., Poddubny, A. N., ... Yassievich, I. N. (2012). Self-trapped exciton state in Si nanocrystals revealed by induced absorption. Physical Review B, 85(16), [161409]. DOI: 10.1103/PhysRevB.85.161409  [details] 

2011

  • Ha, N. N., Cueff, S., Dohnalová, K., Trinh, M. T., Rizk, R., Labbé, C., ... Gregorkiewicz, T. (2011). Photon cutting for excitation Er3+ions in SiO2 sensitized by Si qunatum dots. Physical Review B, 84(24). DOI: 10.1103/PhysRevB.84.241308  [details] 
  • Ha, N. N., Dohnalová, K., & Gregorkiewicz, T. (2011). Evaluation of free carrier losses to 1.54 mu m emission in Si/Si: Er nanolayers on SOI substrate for optical gain observation. Optical Materials, 33(7), 1094-1096. DOI: 10.1016/j.optmat.2010.08.025  [details] 
  • Saeed, S., Timmerman, D., & Gregorkiewicz, T. (2011). Dynamics and microscopic origin of fast 1.5 μm emission in Er-doped SiO2 sensitized with Si nanocrystals. Physical Review B, 83. DOI: 10.1103/PhysRevB.83.155323  [details] 
  • Timmerman, D., Valenta, J., Dohnalová, K., de Boer, W. D. A. M., & Gregorkiewicz, T. (2011). Step-like enhancement of luminescence quantum yield of silicon nanocrystals. Nature Nanotechnology, 6, 710-713. DOI: 10.1038/NNANO.2011.167  [details] 
  • Timmerman, D., Saeed, S., & Gregorkiewicz, T. (2011). Fast dynamics of 1.5 μm photoluminescence in Er-doped SiO2 sensitized with Si nanocrystals. Optical Materials, 33(7), 1091-1093. DOI: 10.1016/j.optmat.2010.12.002  [details] 
  • Wang, Y., Liu, K., Liu, X., Dohnalová, K., Gregorkiewicz, T., Kong, X., ... Zhang, H. (2011). Critical shell thickness of core/shell upconversion luminescence nanoplatform for FRET application. The Journal of Physical Chemistry Letters, 2(17), 2083-2088. DOI: 10.1021/jz200922f  [details] 
  • de Boer, W. D. A. M., Trinh, M. T., Timmerman, D., Schins, J. M., Siebbeles, L. D. A., & Gregorkiewicz, T. (2011). Increased carrier generation rate in Si nanocrystals in SiO2 investigated by induced absorption. Applied Physics Letters, 99(5). DOI: 10.1063/1.3622308  [details] 

2010

  • Ha, N. N., Dohnalová, K., Gregorkiewicz, T., & Valenta, J. (2010). Optical gain of the 1.54 μm emission in MBE-grown Si:Er nanolayers. Physical Review B, 81(19), 195206-195206. DOI: 10.1103/PhysRevB.81.195206  [details] 
  • Ha, N. N., Dohnalová, K., Gregorkiewicz, T., & Valenta, J. (2010). Publisher's note: Optical gain of the 1.54 μm emission in MBE-grown Si:Er nanolayers [Phys. Rev. B 81, 195206 (2010)]. Physical Review B, 81(23), 239902(E). DOI: 10.1103/PhysRevB.81.239902 
  • Ha, N. N., Dohnalová, K., Gregorkiewicz, T., & Valenta, J. (2010). Upper limit of optical gain in MBE-grown Si:Er. Physical Review B, B(81), 195206: 1-6-239902:1.
  • Timmerman, D., Izeddin, I., & Gregorkiewicz, T. (2010). Saturation of luminescence from Si nanocrystals embedded in SiO2. Physica Status Solidi A, 207(1), 183-187. DOI: 10.1002/pssa.200925363  [details] 
  • de Boer, W. D. A. M., Timmerman, D., Dohnalová, K., Yassievich, I. N., Zhang, H., Buma, W. J., & Gregorkiewicz, T. (2010). Red spectral shift and enhanced quantum efficiency in phonon-free photoluminescence from silicon nanocrystals. Nature Nanotechnology, 5(12), 878-884. DOI: 10.1038/nnano.2010.236  [details] 

2009

  • Ha, N. N., Krasil'nik, Z. F., & Gregorkiewicz, T. (2009). Optical properties of Si/Si:Er multi-nanolayer structures grown by SMBE method. Physica B-Condensed Matter, 404(23-24), 5132-5135. DOI: 10.1016/j.physb.2009.08.214  [details] 
  • Minissale, S., Vinh, N. Q., & Gregorkiewicz, T. (2009). On relation between the 1.5 μm Er-related emission and 9 μm vibrational modes of oxygen in silicon. Physica E : Low-dimensial Systems & Nanostructures, 41(6), 1052-1054. DOI: 10.1016/j.physe.2008.08.066  [details] 
  • Minissale, S., Vinh, N. Q., van der Meer, A. F. G., Bresler, M. S., & Gregorkiewicz, T. (2009). Terahertz electromagnetic transitions observed within the 4I15/2 ground multiplet of Er3+ ions in Si. Physical Review B, 79(11), [115324]. DOI: 10.1103/PhysRevB.79.115324  [details] 
  • Timmerman, D., & Gregorkiewicz, T. (2009). Space-separated quantum cutting in differently prepared solid-state dispersions of Si nanocrystals and Er3+ ions in SiO2. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 159-160, 87-89. DOI: 10.1016/j.mseb.2009.02.010  [details] 
  • de Boer, W., Zhang, H., & Gregorkiewicz, T. (2009). Optical spectroscopy of carrier relaxation processes in Si nanocrystals. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 159-160, 190-193. DOI: 10.1016/j.mseb.2008.10.042  [details] 
  • Vinh, N. Q., Ha, N. N., & Gregorkiewicz, T. (2009). Photonic properties of Er-doped crystalline silicon. Proceedings of the IEEE, 97(7), 1269-1283. DOI: 10.1109/JPROC.2009.2018220  [details] 
  • Prokofiev, A. A., Moskalenko, A. S., Yassievich, I. N., de Boer, W. D. A. M., Timmerman, D., Zhang, H., ... Gregorkiewicz, T. (2009). Direct bandgap optical transitions in Si nanocrystals. JETP Letters, 90(12), 758-762. DOI: 10.1134/S0021364009240059  [details] 

2008

  • Izeddin, I., Klik, M. A. J., Vinh, N. Q., Bresler, M. S., & Gregorkiewicz, T. (2008). Mid-infrared spectroscopy of the Er-related donor state in Si/Si:Er3+ nanolayers. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 146(1-3), 131-134. DOI: 10.1016/j.mseb.2007.07.082  [details] 
  • Izeddin, I., Timmerman, D., Gregorkiewicz, T., Moskalenko, A. S., Prokofiev, A. A., Yassievich, I. N., & Fujii, M. (2008). Energy transfer in Er-doped SiO2 sensitized with Si nanocrystals. Physical Review B, 78(3), 035327. DOI: 10.1103/PhysRevB.78.035327  [details] 
  • Minissale, S., Vinh, N. Q., & Gregorkiewicz, T. (2008). Pump-probe investigations of THz transitions in Si/Si:Er3+ nanolayers. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 146(1-3), 160-162. DOI: 10.1016/j.mseb.2007.07.034  [details] 
  • Minissale, S., Vinh, N. Q., de Boer, W., Bresler, M. S., & Gregorkiewicz, T. (2008). Microscopic evidence for role of oxygen in luminescence of Er3+ ions in Si: Two-color and pump-probe spectroscopy. Physical Review B, 78(3), 035313. DOI: 10.1103/PhysRevB.78.035313  [details] 
  • Timmerman, D., Izeddin, I., dr. Stallinga, P., Yassievich, I. N., & Gregorkiewicz, T. (2008). Space-separated quantum cutting with silicon nanocrystals for photovoltaic applications. Nature Photonics, 2, 105-109. DOI: 10.1038/nphoton.2007.279  [details] 
  • Vrielinck, H., Zverev, D., Smet, P. F., Poelman, D., Gregorkiewicz, T., & Callens, F. (2008). Electron paramagnetic resonance study of centres involved in storage processes in K2YF5: RE thermoluminescent phosphors. Materials Science and Engineering B-Advanced Functional Solid-State Materials, 146(1-3), 16-21. DOI: 10.1016/j.mseb.2007.07.039  [details] 

2017

  • de Boer, W., Timmerman, D., Yassievich, I., Capretti, A., & Gregorkiewicz, T. (2017). Reply to 'Absence of redshift in the direct bandgap of silicon nanocrystals with reduced size'. Nature Nanotechnology, 12(10), 932-933. DOI: 10.1038/nnano.2017.202  [details] 
  • Nguyen, X. C., Limpens, R., & Gregorkiewicz, T. (2017). Photoluminescence quantum yield in ensembles of Si nanocrystals. Advanced Optical Materials, 5(4), [1600709 ]. DOI: 10.1002/adom.201600709  [details] 

2015

  • Nguyen, X. C., Gregorkiewicz, T., & Limpens, R. (2015). Investigating photoluminescence quantum yield of silicon nanocrystals formed in SiOx with different initial Si excess. In SPIE (pp. 9562O)

2012

2008

2011

  • de Boer, W., Limpens, R., & Gregorkiewicz, T. (2011). Oogverblindende silicium nanokristallen?! Nederlands Tijdschrift voor Natuurkunde, 77(5), 148-151. [details] 

Talk / presentation

  • Gregorkiewicz, T. (speaker) (3-10-2016). Efficient energy recycling in Si nanocrystals, – The 3rd International Conference on Advanced Materials and Nanotechnology, Hanoi, October 2016, Hanoi, Viet Nam.
  • Gregorkiewicz, T. (speaker) (18-1-2016). Energy recycling and transfer in Si nanocrystals, MISW2 Winter School, Korea, Republic of.

2017

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