Ing. Stoklas Roman, PhD.

Šichman, P., Hasenöhrl, S., Stoklas, R., Priesol, J., Dobročka, E., Haščík, Š., Gucmann, F., Vincze, A., Chvála, A., Marek, J., Šatka, A., and Kuzmík, J.: Semi-insulating GaN for vertical structures: role of substrate selection and growth pressure, Mater. Sci Semicond. Process. 118 (2020) 105203.

  1. Mochizuki, K.: Japan. J. Applied Phys. 60 (2021) 018002.

Pohorelec, O., Ťapajna, M., Gregušová, D., Gucmann, F., Hasenöhrl, S., Haščík, Š., Stoklas, R., Seifertová, A., Pécz, B., Tóth, L., and Kuzmík, J.: Investigation of interfaces and threshold voltage instabilities in normally-off MOS-gated InGaN/AlGaN/GaN HEMTs, Applied Surface Sci 528 (2020) 146824.

1. Tian, Y.: Inter. J. Electrochem. Sci 15 (2020) 12682.

Hasenöhrl, S., Chauhan, P., Dobročka, E., Stoklas, R., Vančo, Ľ., Veselý, M., Bouazzaoui, F., Chauvat, M.-P., Reterana, P., and Kuzmík, J.: Generation of hole gas in non-inverted InAl(Ga)N/GaN heterostructures, Applied Phys. Express 12 (2019) 014001.

1. Murugapandiyan, P.: J. Electronic Mater. ‏49 (2020) SI524.

Stoklas, R., Gregušová, D., Hasenöhrl, S., Brytavskyi, I.V., Ťapajna, M., Fröhlich, K., Haščík, Š., Gregor, M., and Kuzmík, J.: Characterization of interface states in AlGaN/GaN metal-oxide-semiconductor heterostructure field-effect transistors with HfO2 gate dielectric grown by atomic layer deposition, Applied Surface Sci 461 (2018) 255-259.

1. Ber, E.: IEEE Trans. Electron Dev. 66 (2019) 2100.
2. Zhang, X.-Y.: Nanoscale Res. Lett. 14 (2019) 83.
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Ťapajna, M., Stoklas, R., Gregušová, D., Gucmann, F., Hušeková, K., Haščík, Š., Fröhlich, K., Toth, L., Pecz, B., Micusik, M., Brunner, F., and Kuzmík, J.: Investigation of ‘surface donors’ in Al2O3/AlGaN/GaN metal-oxide-semiconductor heterostructures: Correlation of electrical, structural, and chemical properties, Applied Surface Sci 426 (2017) 656-661.

1. Huang, H.: J. Phys. D 51(2018) 345102.
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3. Shi, Y.: IEEE Trans. Electron Dev. 66 (2019) 4164.
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6. Asubar, J.T.: IEEE Electron Dev. Lett. 41 (2020) ‏ 693.
7. Cai, Y.: Japan. J. Applied Phys. 59 (2020) 041001.
8. Low, R.S.: Applied Phys. Express 14 (2021) 031004.

Matys, M., Stoklas, R., Blaho, M., and Adamowicz, B.: Origin of positive fixed charge at insulator/AlGaN interfaces and its control by AlGaN composition, Applied Phys. Lett. 110 (2017) 243505.

1. Uedono, A.: J. Applied Phys. 123 (2018) 155302.
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6. Tapajna, M.: Crystals 10 (2020) 1153.
7. Xie, Y.: Optics Comm.‏ 483 (2021) 126669.

Florovič, M., Stoklas, R. , Kováč, J., and Kordoš, P.: Temperature-induced instability of the threshold voltage in GaN-based heterostructure field-effect transistors, Semicond. Sci Technol. 32 (2017) 025017.

1. Wang, N.: AIP Adv. 7 (2017) 095317.
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3. Chakraborty, A.: Superlatt. Microstr. 113 (2018) 147.
4. Cui, M.: IEEE Access 7 (2019) 184375.

Stoklas, R., Gregušová, D., Blaho, M., Fröhlich, K., Novák, J., Matys, M., Yatabe, Z.,  Kordoš, P., and Hashizume, T.: Influence of oxygen-plasma treatment on AlGaN/GaN metal-oxide-semiconductor heterostructure field-effect transistors with HfO2 by atomic layer deposition: leakage current and density of states reduction, Semicond. Sci Technol. 32 (2017) 045018.

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8. Cai, Y.: ICICDT 2019.
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13. Choi, S.: J. Alloys Compounds 854 (2021) 157186.

Gregušová, D., Gucmann, F., Kúdela, R., Mičušík, M., Stoklas, R., Válik, L., Greguš, J., Blaho, M., Kordoš, P., :Properties of InGaAs/GaAs metal-oxide-semiconductor heterostructure field-effect transistors modified by surface treatment,. Applied Surface Sci 395 (2017) 140-144.

1. Silva, J.C.F.: J. Molecular Model. 23 (2017) 204.
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3. Sharma, I.: J. Alloys Compounds 723 (2017) 50.
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Matys, M., Adamowicz, J.B., Domanowska, A., Michalewicz, A., Stoklas, R., Akazawa, M., Yatabe, Z., and Hashizume, T.: On the origin of interface states at oxide/III-nitride heterojunction interfaces, J. Applied Phys. 119 (2016) 225305.

1. Uedono, A.: J. Applied Phys. 123 (2018) 155302.
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10. Duong D.N.: J. Applied Phys. 127 (2020) 094501.

Ťapajna, M., Stoklas, R., Gregušová, D., Válik, L., Gucmann, F., Hušeková, K., Haščík, Š., Fröhlich, K., Toth, L., Pecz, B., Micusik, M., Brunner, F., Hashizume, T., and Kuzmík, J.: On the origin of surface donors in AlGaN/GaN metal-oxide semiconductor heterostructures with Al2O3 gate dielectric—correlation of electrical, structural, and chemical properties. In: Inter. Workshop on Nitride Semicond. (IWN 2016) Orlando 2016.

1. Akazawa, M.: Phys. Status Solidi B 254 (2017) 1600691.

Florovic, M., Stoklas, R., and Kordos, P.: Temperature dependence of the threshold voltage in GaN-based HFETs and MOSHFETs. In: WOCSDICE EXMATEC 2016.

1. Alshahed, M.: IEEE Proc. ESSDERC Conf. 2017 P.196.

Matys, M., Stoklas, R., Kuzmík, J., Adamowicz, J., Yatabe, Z., and Hashizume, T.: Characterization of capture cross sections of interface states in dielectric/III-nitride heterojunction structures, J. Applied Phys. 119 (2016) 205304.

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Osvald, J., Stoklas, R., and Kordoš, P.: Low- and high-frequency capacitance of aluminum gallium nitride/gallium nitride heterostructures with interface traps, Mater. Sci in Semicond. Process. 31 (2015) 525-529.

1. Ziane, A.: J. Electron. Mater. 47 (2018) 5283.
2. Hoshii, T.: Japan. J. Applied Phys. 58 (2019) 061006.

Osvald, J., Stoklas, R., Kordoš, P., : Extraction of interface trap density of Al2O3/AlGaN/GaN MIS heterostructure capacitance. Phys. Status Solidi B 252 (2015) 996-1000.

1. Suria, A.J.: Semicond. Sci Technol. 31  (2016) 115017.
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Gucmann, F., Gregušová, D., Stoklas, R., Dérer, J., Kúdela, R., Fröhlich, K., and Kordoš, P.: InGaAs/GaAs metal-oxide-semiconductor heterostructure field-effect transistors with oxygen-plasma oxide and Al2O3 double-layer insulator, Applied Phys. Lett. 105 (2014) 183504.

1. Kim, S.-H.: IEEE Electron Device Lett. 36 (2015) 884.
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Stoklas, R., Gregušová, D., Hušeková, K., Marek, J., and Kordoš, P.: Trapped charge effects in AlGaN/GaN metal-oxide-semiconductor structures with Al2O3 and ZrO2 gate insulator, Semicond. Sci Technol. 29 (2014) 045003.

 1. Yatabe, Z.: Japan. J. Applied Phys. 53 (2014) 100213.
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Kordoš, P., Stoklas, R., Gregušová, D., Hušeková, K., Carlin, J., Grandjean, N., : Defect states characterization of non-annealed and annealed Zr2/InAlN/GaN structures by capacitance measurements,. Applied Phys. Lett. 102 (2013) 063502.

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5. Cui, P.: Japan. J. Applied Phys. 59 (2020) 020901.

Laurenčíková, A., Hasenöhrl, S., Eliáš, P., Stoklas, R., Blaho, M., Novotný, I., Križanová, Z., Novák, J., :Ohmic contacts to p-GaP/n-ZnO core/shell nanowires based on Au metallization. Applied Surface Sci 267 (2013) 60-64.

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Hasenöhrl, S., Eliáš, P., Šoltýs, J., Stoklas, R., Laurenčíková, A., Novák, J., : Zinc-doped gallium phosphide nanowires for photovoltaic structures,. Applied Surface Sci 269 (2013) 72-76.

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Gregušová, D., Hušeková, K., Stoklas, R., Blaho, M., Jurkovič, M., Carlin, J., Grandjean, N., and Kordoš, P.:Zr2/InAlN/GaN metal-oxide-semiconductor heterostructure field-effect transistors with InAlN barrier of different compositions. Japan. J. Applied Phys. 52 (2013) 08JN07.

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Kordoš, P., Kúdela, R., Stoklas, R., Čičo, K., Mikulics, M., Gregušová, D., Novák, J., : Aluminum oxide as passivation and gate insulator in GaAs-based field-effect transistors prepared in situ by metal-organic vapor deposition. Applied Phys. Lett. 100 (2012) 142113.

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Novák, J., Šoltýs, J., Eliáš, P., Hasenöhrl, S., Stoklas, R., Laurenčíková, A., Mikulics, M., : Electrical and photoluminescence properties of individual GaP nanowires doped by zinc Phys. Status Solidi a 209 (2012) 2505-2509.

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Novák, J., Novotný, I., Kováč, J., Eliáš, P., Hasenöhrl, S., Križanová, Z., Vávra, I., Stoklas, R., : Preparation of thin Ga-doped ZnO layers for core–shell GaP/ZnO nanowires. Applied Surface Sci 258 (2012) 7607-7611

1. Jiang, Y.: Phys. Chem. Chem. Phys. 17 (2015) 16784.
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Kordoš, P., Mikulics, M., Stoklas, R., Čičo, K., Dadgar, A., Grützmacher, D., Krost, A., : Thermally oxidized InAlN of different compositions for InAlN/GaN heterostructure field-effect transistors. J. Electronic Mater. 41 (2012) 3013-3016.

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Čičo, K., Hušeková, K., Ťapajna, M., Gregušová, D., Stoklas, R., Kuzmík, J., Carlin, J., Grandjean, N., Pogany, D., and Fröhlich, K.: Electrical properties of InAlN/GaN high electron mobility transistor with Al2O3, ZrO2, and GdScO3 gate dielectrics, J. Vacuum Sci Technol. B 29 (2011) 01A808.

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Stoklas, R., Gregušová, D., Gaži, Š., Novák, J., and Kordoš, P.: Performance of AlGaN/GaN metal-insulator-semiconductor heterostructure field-effect transistors with AlN gate insulator prepared by reactive magnetron sputtering. J. Vacuum Sci Technol. B 29 (2011) 01A809.

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Mikulics, M., Stoklas, R., Dadgar, A., Gregušová, D., Novák, J., Grützmacher, D., Krost, A., and Kordoš, P.:InAlN/GaN/Si heterostructures and field-effect transistors with lattice matched and tensely or compressively strained InAlN, Applied Phys. Lett. 97 (2010) 173505.

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Gregušová, D., Gaži, Š., Sofer, Z., Stoklas, R., Dobročka, E., Mikulics, M., Greguš, J., Novák, J., Kordoš, P., : Oxidized Al film as an insulation layer in AlGaN/GaN Metal–Oxide–Semiconductor heterostructure field effect transistors Japan. J. Applied Phys. 49 (2010) art. no. 046504.

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Kordoš, P., Stoklas, R., Gregušová, D., Gaži, Š., Novák, J., : Trapping effects in Al2O3/AlGaN/GaN metal-oxide-semiconductor heterostructure field-effect transistor investigated by temperature dependent conductance measurement. Applied Phys. Lett. 96 (2010) 013505.

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