TY  - JOUR
AU  - Jovanović, Djordje
AU  - Petrović, Miloš
AU  - Tomašević-Ilić, Tijana
AU  - Matković, Aleksandar
AU  - Bokalič, Matevž
AU  - Spasenović, Marko
AU  - Rogdakis, Konstantinos
AU  - Kymakis, Emmannuel
AU  - Knežević, Dragan
AU  - Cina, Lucio
AU  - Gajić, Radoš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6491
AB  - A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.
PB  - Elsevier
T2  - Solar Energy Materials and Solar Cells
T1  - Long-term stability of graphene/c-Si Schottky-junction solar cells
VL  - 258
SP  - 112414
DO  - 10.1016/j.solmat.2023.112414
ER  - 

@article{
author = "Jovanović, Djordje and Petrović, Miloš and Tomašević-Ilić, Tijana and Matković, Aleksandar and Bokalič, Matevž and Spasenović, Marko and Rogdakis, Konstantinos and Kymakis, Emmannuel and Knežević, Dragan and Cina, Lucio and Gajić, Radoš",
year = "2023",
abstract = "A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.",
publisher = "Elsevier",
journal = "Solar Energy Materials and Solar Cells",
title = "Long-term stability of graphene/c-Si Schottky-junction solar cells",
volume = "258",
pages = "112414",
doi = "10.1016/j.solmat.2023.112414"
}

Jovanović, D., Petrović, M., Tomašević-Ilić, T., Matković, A., Bokalič, M., Spasenović, M., Rogdakis, K., Kymakis, E., Knežević, D., Cina, L.,& Gajić, R.. (2023). Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells
Elsevier., 258, 112414.
https://doi.org/10.1016/j.solmat.2023.112414

Jovanović D, Petrović M, Tomašević-Ilić T, Matković A, Bokalič M, Spasenović M, Rogdakis K, Kymakis E, Knežević D, Cina L, Gajić R. Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells. 2023;258:112414.
doi:10.1016/j.solmat.2023.112414 .

Jovanović, Djordje, Petrović, Miloš, Tomašević-Ilić, Tijana, Matković, Aleksandar, Bokalič, Matevž, Spasenović, Marko, Rogdakis, Konstantinos, Kymakis, Emmannuel, Knežević, Dragan, Cina, Lucio, Gajić, Radoš, "Long-term stability of graphene/c-Si Schottky-junction solar cells" in Solar Energy Materials and Solar Cells, 258 (2023):112414,
https://doi.org/10.1016/j.solmat.2023.112414 . .

TY  - JOUR
AU  - Jovanović, Djordje
AU  - Petrović, Miloš
AU  - Tomašević-Ilić, Tijana
AU  - Matković, Aleksandar
AU  - Bokalič, Matevž
AU  - Spasenović, Marko
AU  - Rogdakis, Konstantinos
AU  - Kymakis, Emmannuel
AU  - Knežević, Dragan
AU  - Cina, Lucio
AU  - Gajić, Radoš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6490
AB  - A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.
PB  - Elsevier
T2  - Solar Energy Materials and Solar Cells
T1  - Long-term stability of graphene/c-Si Schottky-junction solar cells
VL  - 258
SP  - 112414
DO  - 10.1016/j.solmat.2023.112414
ER  - 

@article{
author = "Jovanović, Djordje and Petrović, Miloš and Tomašević-Ilić, Tijana and Matković, Aleksandar and Bokalič, Matevž and Spasenović, Marko and Rogdakis, Konstantinos and Kymakis, Emmannuel and Knežević, Dragan and Cina, Lucio and Gajić, Radoš",
year = "2023",
abstract = "A long operational lifetime is required for the use of solar cells in real-life photovoltaic applications. The optimization of operational lifetimes is achieved through understanding the inherent degradation phenomena in solar cells. In this study, graphene/Si Schottky-junction solar cells were produced, utilizing liquid-phase-exfoliated graphene as an active surface. The operational and interface stability of these solar cells over a period of 5 years in ambient conditions (following ISOS-D protocols: dark storage/shelf life) was examined, and the origin of their degradation was reported. It was found that the dominant degradation mechanism could be attributed to the degradation of silver contacts. This was indicated by a decrease in shunt resistance, an increase in the ideality factor (due to a higher carrier recombination), and a constant defect density in graphene films for up to 4 years. Measurements across the solar cell's active area during the 5-year period revealed neither significant spatial inhomogeneity, nor shunt channel defects.",
publisher = "Elsevier",
journal = "Solar Energy Materials and Solar Cells",
title = "Long-term stability of graphene/c-Si Schottky-junction solar cells",
volume = "258",
pages = "112414",
doi = "10.1016/j.solmat.2023.112414"
}

Jovanović, D., Petrović, M., Tomašević-Ilić, T., Matković, A., Bokalič, M., Spasenović, M., Rogdakis, K., Kymakis, E., Knežević, D., Cina, L.,& Gajić, R.. (2023). Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells
Elsevier., 258, 112414.
https://doi.org/10.1016/j.solmat.2023.112414

Jovanović D, Petrović M, Tomašević-Ilić T, Matković A, Bokalič M, Spasenović M, Rogdakis K, Kymakis E, Knežević D, Cina L, Gajić R. Long-term stability of graphene/c-Si Schottky-junction solar cells. in Solar Energy Materials and Solar Cells. 2023;258:112414.
doi:10.1016/j.solmat.2023.112414 .

Jovanović, Djordje, Petrović, Miloš, Tomašević-Ilić, Tijana, Matković, Aleksandar, Bokalič, Matevž, Spasenović, Marko, Rogdakis, Konstantinos, Kymakis, Emmannuel, Knežević, Dragan, Cina, Lucio, Gajić, Radoš, "Long-term stability of graphene/c-Si Schottky-junction solar cells" in Solar Energy Materials and Solar Cells, 258 (2023):112414,
https://doi.org/10.1016/j.solmat.2023.112414 . .

TY  - JOUR
AU  - Vasić, Borislav
AU  - Ralević, Uroš
AU  - Cvetanović Zobenica, Katarina
AU  - Smiljanić, Milče M.
AU  - Gajić, Radoš
AU  - Spasenović, Marko
AU  - Vollebregt, Sten
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3351
AB  - Chemical vapour deposition (CVD) is a promising method for producing large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the production cycle. Recently, molybdenum (Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due to a better matching of the thermal expansion coefficient of the substrate and Gr. We investigate the quality of multilayer Gr grown on Mo and the relation between Gr morphology and nanoscale mechanical and electrical properties, and spatial homogeneity of these parameters. With atomic force microscopy (AFM) based scratching, Kelvin probe force microscopy, and conductive AFM, we measure friction and wear, surface potential, and local conductivity, respectively. We find that Gr grown on Mo is free of large wrinkles that are common with growth on other metals, although it contains a dense network of small wrinkles. We demonstrate that as a result of this unique and favorable morphology, the Gr studied here has low friction, high wear resistance, and excellent homogeneity of electrical surface potential and conductivity.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum
DO  - 10.1016/j.apsusc.2019.144792
ER  - 

@article{
author = "Vasić, Borislav and Ralević, Uroš and Cvetanović Zobenica, Katarina and Smiljanić, Milče M. and Gajić, Radoš and Spasenović, Marko and Vollebregt, Sten",
year = "2020",
abstract = "Chemical vapour deposition (CVD) is a promising method for producing large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the production cycle. Recently, molybdenum (Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due to a better matching of the thermal expansion coefficient of the substrate and Gr. We investigate the quality of multilayer Gr grown on Mo and the relation between Gr morphology and nanoscale mechanical and electrical properties, and spatial homogeneity of these parameters. With atomic force microscopy (AFM) based scratching, Kelvin probe force microscopy, and conductive AFM, we measure friction and wear, surface potential, and local conductivity, respectively. We find that Gr grown on Mo is free of large wrinkles that are common with growth on other metals, although it contains a dense network of small wrinkles. We demonstrate that as a result of this unique and favorable morphology, the Gr studied here has low friction, high wear resistance, and excellent homogeneity of electrical surface potential and conductivity.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum",
doi = "10.1016/j.apsusc.2019.144792"
}

Vasić, B., Ralević, U., Cvetanović Zobenica, K., Smiljanić, M. M., Gajić, R., Spasenović, M.,& Vollebregt, S.. (2020). Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum. in Applied Surface Science
Elsevier..
https://doi.org/10.1016/j.apsusc.2019.144792

Vasić B, Ralević U, Cvetanović Zobenica K, Smiljanić MM, Gajić R, Spasenović M, Vollebregt S. Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum. in Applied Surface Science. 2020;.
doi:10.1016/j.apsusc.2019.144792 .

Vasić, Borislav, Ralević, Uroš, Cvetanović Zobenica, Katarina, Smiljanić, Milče M., Gajić, Radoš, Spasenović, Marko, Vollebregt, Sten, "Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum" in Applied Surface Science (2020),
https://doi.org/10.1016/j.apsusc.2019.144792 . .

TY  - JOUR
AU  - Vasić, Borislav
AU  - Ralević, Uroš
AU  - Cvetanović Zobenica, Katarina
AU  - Smiljanić, Milče M.
AU  - Gajić, Radoš
AU  - Spasenović, Marko
AU  - Vollebregt, Sten
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3347
AB  - Chemical vapour deposition (CVD) is a promising method for producing large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the production cycle. Recently, molybdenum (Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due to a better matching of the thermal expansion coefficient of the substrate and Gr. We investigate the quality of multilayer Gr grown on Mo and the relation between Gr morphology and nanoscale mechanical and electrical properties, and spatial homogeneity of these parameters. With atomic force microscopy (AFM) based scratching, Kelvin probe force microscopy, and conductive AFM, we measure friction and wear, surface potential, and local conductivity, respectively. We find that Gr grown on Mo is free of large wrinkles that are common with growth on other metals, although it contains a dense network of small wrinkles. We demonstrate that as a result of this unique and favorable morphology, the Gr studied here has low friction, high wear resistance, and excellent homogeneity of electrical surface potential and conductivity.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum
VL  - 509
SP  - 144792
DO  - 10.1016/j.apsusc.2019.144792
ER  - 

@article{
author = "Vasić, Borislav and Ralević, Uroš and Cvetanović Zobenica, Katarina and Smiljanić, Milče M. and Gajić, Radoš and Spasenović, Marko and Vollebregt, Sten",
year = "2020",
abstract = "Chemical vapour deposition (CVD) is a promising method for producing large-scale graphene (Gr). Nevertheless, microscopic inhomogeneity of Gr grown on traditional metal substrates such as copper or nickel results in a spatial variation of Gr properties due to long wrinkles formed when the metal substrate shrinks during the cooling part of the production cycle. Recently, molybdenum (Mo) has emerged as an alternative substrate for CVD growth of Gr, mainly due to a better matching of the thermal expansion coefficient of the substrate and Gr. We investigate the quality of multilayer Gr grown on Mo and the relation between Gr morphology and nanoscale mechanical and electrical properties, and spatial homogeneity of these parameters. With atomic force microscopy (AFM) based scratching, Kelvin probe force microscopy, and conductive AFM, we measure friction and wear, surface potential, and local conductivity, respectively. We find that Gr grown on Mo is free of large wrinkles that are common with growth on other metals, although it contains a dense network of small wrinkles. We demonstrate that as a result of this unique and favorable morphology, the Gr studied here has low friction, high wear resistance, and excellent homogeneity of electrical surface potential and conductivity.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum",
volume = "509",
pages = "144792",
doi = "10.1016/j.apsusc.2019.144792"
}

Vasić, B., Ralević, U., Cvetanović Zobenica, K., Smiljanić, M. M., Gajić, R., Spasenović, M.,& Vollebregt, S.. (2020). Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum. in Applied Surface Science
Elsevier., 509, 144792.
https://doi.org/10.1016/j.apsusc.2019.144792

Vasić B, Ralević U, Cvetanović Zobenica K, Smiljanić MM, Gajić R, Spasenović M, Vollebregt S. Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum. in Applied Surface Science. 2020;509:144792.
doi:10.1016/j.apsusc.2019.144792 .

Vasić, Borislav, Ralević, Uroš, Cvetanović Zobenica, Katarina, Smiljanić, Milče M., Gajić, Radoš, Spasenović, Marko, Vollebregt, Sten, "Low-friction, wear-resistant, and electrically homogeneous multilayer graphene grown by chemical vapor deposition on molybdenum" in Applied Surface Science, 509 (2020):144792,
https://doi.org/10.1016/j.apsusc.2019.144792 . .

TY  - JOUR
AU  - Golubović, Aleksandar
AU  - Gajić, Radoš
AU  - Nikolić, Slobodanka
AU  - Djurić, Stevan
AU  - Valčić, Andreja
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3498
AB  - LiNbO3 single crystals were grown by the Czochralski technique in an air
atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate of rotation wc
= 35 rpm were calculated from the dynamic of fluids equations for buoyancy-driven
and forced convections under which the shape of the melt/crystal interface changed. The
domain inversion was carried out at 1473 K using a 10 min 3.75 V/cm electric field.
The obtained crystals were cut, polished and etched to determine the presence of
dislocations and single domain structures. The lattice parameters a = 0.51494 nm, c =
1.38620 nm and V = 0.3186 nm
3
were determined by X-ray powder diffraction. The
optical properties were studied by infrared spectroscopy in the wave number range 20 
5000 cm
-1
. With decreasing temperature, an atypical behaviour of the phonon modes,
due to the ferroelectric properties of LiNbO3 single crystal, could be seen. The optical
constants were calculated by Kramers-Kronig analysis and the value of the critical
temperature was estimated. The obtained results are discussed and compared with
published data.
AB  - Monokristali LiNbO3 su dobijeni metodom rasta kristala po Čohralskom na
 vazduhu.Iz jednačina dinamike fluida za termičku i forsiranu konvekciju izračunati
 su kritični prečnik kristala Dc
 = 1,5 cm i vrednost kritične brzine rotacije wc = 35
 o/min pri kojima dolazi do promene oblika fronta kristalizacije. Monodomenizacija
 je obavljena na temperaturi od 1473 K, pri električnom polju od 3,75 V/cm u trajanju od
 10 minuta. Dobijeni kristali su sečeni, polirani i nagrizani da bi se odredilo
 prisustvo dislokacija i dobijanje monodomenske strukture. Rendgenskom difrakcijom
 praha odredjeni su parametri jedinične ćelije a = 0,51494 nm
 , c = 1,38620 nm i zapremina
 V = 0,3186 nm
 3
 .Optičke osobine su proučavane u infracrvenoj oblasti spektra u opsegu
 talasnih brojeva od 20–5000 cm
 –1
 . Refleksioni spektri su snimani na različitim
 temperaturama da bi se posmatrao položaj fononskih modova. Sa opadanjem temperature
 može da se vidi atipično ponašanje fononskih modova što se pripisuje feroelektričnim
  osobinama monokristala LiNbO3. Optičke konstante monokristala LiNbO3 su
 dobijene korišćenjem Kramers-Kronig analize i procenjena je vrednost kritične temperature.Dobijeni rezultati su diskutovani i uporedjivani sa podacima iz literature.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The crystallization and optical properties of LiNbO3 single crystals
T1  - Kristalizacija i optičke osobine monokristala LiNbO3
VL  - 65
IS  - 5-6
SP  - 391
EP  - 397
DO  - 10.2298/JSC0006391G
ER  - 

@article{
author = "Golubović, Aleksandar and Gajić, Radoš and Nikolić, Slobodanka and Djurić, Stevan and Valčić, Andreja",
year = "2000",
abstract = "LiNbO3 single crystals were grown by the Czochralski technique in an air
atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate of rotation wc
= 35 rpm were calculated from the dynamic of fluids equations for buoyancy-driven
and forced convections under which the shape of the melt/crystal interface changed. The
domain inversion was carried out at 1473 K using a 10 min 3.75 V/cm electric field.
The obtained crystals were cut, polished and etched to determine the presence of
dislocations and single domain structures. The lattice parameters a = 0.51494 nm, c =
1.38620 nm and V = 0.3186 nm
3
were determined by X-ray powder diffraction. The
optical properties were studied by infrared spectroscopy in the wave number range 20 
5000 cm
-1
. With decreasing temperature, an atypical behaviour of the phonon modes,
due to the ferroelectric properties of LiNbO3 single crystal, could be seen. The optical
constants were calculated by Kramers-Kronig analysis and the value of the critical
temperature was estimated. The obtained results are discussed and compared with
published data., Monokristali LiNbO3 su dobijeni metodom rasta kristala po Čohralskom na
 vazduhu.Iz jednačina dinamike fluida za termičku i forsiranu konvekciju izračunati
 su kritični prečnik kristala Dc
 = 1,5 cm i vrednost kritične brzine rotacije wc = 35
 o/min pri kojima dolazi do promene oblika fronta kristalizacije. Monodomenizacija
 je obavljena na temperaturi od 1473 K, pri električnom polju od 3,75 V/cm u trajanju od
 10 minuta. Dobijeni kristali su sečeni, polirani i nagrizani da bi se odredilo
 prisustvo dislokacija i dobijanje monodomenske strukture. Rendgenskom difrakcijom
 praha odredjeni su parametri jedinične ćelije a = 0,51494 nm
 , c = 1,38620 nm i zapremina
 V = 0,3186 nm
 3
 .Optičke osobine su proučavane u infracrvenoj oblasti spektra u opsegu
 talasnih brojeva od 20–5000 cm
 –1
 . Refleksioni spektri su snimani na različitim
 temperaturama da bi se posmatrao položaj fononskih modova. Sa opadanjem temperature
 može da se vidi atipično ponašanje fononskih modova što se pripisuje feroelektričnim
  osobinama monokristala LiNbO3. Optičke konstante monokristala LiNbO3 su
 dobijene korišćenjem Kramers-Kronig analize i procenjena je vrednost kritične temperature.Dobijeni rezultati su diskutovani i uporedjivani sa podacima iz literature.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The crystallization and optical properties of LiNbO3 single crystals, Kristalizacija i optičke osobine monokristala LiNbO3",
volume = "65",
number = "5-6",
pages = "391-397",
doi = "10.2298/JSC0006391G"
}

Golubović, A., Gajić, R., Nikolić, S., Djurić, S.,& Valčić, A.. (2000). The crystallization and optical properties of LiNbO3 single crystals. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 65(5-6), 391-397.
https://doi.org/10.2298/JSC0006391G

Golubović A, Gajić R, Nikolić S, Djurić S, Valčić A. The crystallization and optical properties of LiNbO3 single crystals. in Journal of the Serbian Chemical Society. 2000;65(5-6):391-397.
doi:10.2298/JSC0006391G .

Golubović, Aleksandar, Gajić, Radoš, Nikolić, Slobodanka, Djurić, Stevan, Valčić, Andreja, "The crystallization and optical properties of LiNbO3 single crystals" in Journal of the Serbian Chemical Society, 65, no. 5-6 (2000):391-397,
https://doi.org/10.2298/JSC0006391G . .