TY  - CONF
AU  - Stefanović, Milica
AU  - Lukić, Ivana
AU  - Vujančević, Jelena
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13636
AB  - The organo-inorganic perovskites are extraordinary materials that have recently revolutionized the field of photovoltaics due to their low-cost fabrication and high optical absorption. In a short period, they reached great efficiency. Many parameters which affect the quality of perovskite films can be optimized, so the efficiency of these devices can be further improved. In perovskite solar cells, the perovskite layer is an active layer that absorbs the visible part of the spectrum, resulting in the formation of the electron-hole pair. To decrease the recombination of charge carriers, the construction of solar cells requires the existence of two additional layers in order to separate the holes and electrons. TiO2 could be used as an electron transport layer because its conduction band (CB) lies under the CB of perovskite. In that way, electrons diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure provides a one-dimensional transmission channel for the charge carriers, which resulting in faster carrier transport. Perovskite methylammonium lead bromide (MAPbBr3) was coupled with TiO2 nanotube arrays which were synthesized by anodization of Ti foil and annealed at 450 °C. The most used methods for deposition of perovskite materials on mesoporous and planar TiO2 are: one-step deposition, two-step sequential deposition, and vapor-assisted solution processing. Disadvantage of these methods is a small contact area between TiO2 and perovskite. The aim of this research was to increase the contact surface of the perovskite and TiO2 nanotubes by filling the nanotubes with the perovskite material in order to improve electron transport.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program & Book of Abstracts / Second International Conference ELMINA 2022, Belgrade, Serbia, August 22nd-26th, 2022
T1  - Improving the contact surface between TiO2 nanotubes and MAPbBr3 to make perovskite solar cells
SP  - 188
EP  - 189
UR  - https://hdl.handle.net/21.15107/rcub_dais_13636
ER  - 

@conference{
author = "Stefanović, Milica and Lukić, Ivana and Vujančević, Jelena and Petrović, Rada and Janaćković, Đorđe",
year = "2022",
abstract = "The organo-inorganic perovskites are extraordinary materials that have recently revolutionized the field of photovoltaics due to their low-cost fabrication and high optical absorption. In a short period, they reached great efficiency. Many parameters which affect the quality of perovskite films can be optimized, so the efficiency of these devices can be further improved. In perovskite solar cells, the perovskite layer is an active layer that absorbs the visible part of the spectrum, resulting in the formation of the electron-hole pair. To decrease the recombination of charge carriers, the construction of solar cells requires the existence of two additional layers in order to separate the holes and electrons. TiO2 could be used as an electron transport layer because its conduction band (CB) lies under the CB of perovskite. In that way, electrons diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure provides a one-dimensional transmission channel for the charge carriers, which resulting in faster carrier transport. Perovskite methylammonium lead bromide (MAPbBr3) was coupled with TiO2 nanotube arrays which were synthesized by anodization of Ti foil and annealed at 450 °C. The most used methods for deposition of perovskite materials on mesoporous and planar TiO2 are: one-step deposition, two-step sequential deposition, and vapor-assisted solution processing. Disadvantage of these methods is a small contact area between TiO2 and perovskite. The aim of this research was to increase the contact surface of the perovskite and TiO2 nanotubes by filling the nanotubes with the perovskite material in order to improve electron transport.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program & Book of Abstracts / Second International Conference ELMINA 2022, Belgrade, Serbia, August 22nd-26th, 2022",
title = "Improving the contact surface between TiO2 nanotubes and MAPbBr3 to make perovskite solar cells",
pages = "188-189",
url = "https://hdl.handle.net/21.15107/rcub_dais_13636"
}

Stefanović, M., Lukić, I., Vujančević, J., Petrović, R.,& Janaćković, Đ.. (2022). Improving the contact surface between TiO2 nanotubes and MAPbBr3 to make perovskite solar cells. in Program & Book of Abstracts / Second International Conference ELMINA 2022, Belgrade, Serbia, August 22nd-26th, 2022
Belgrade : Serbian Academy of Sciences and Arts., 188-189.
https://hdl.handle.net/21.15107/rcub_dais_13636

Stefanović M, Lukić I, Vujančević J, Petrović R, Janaćković Đ. Improving the contact surface between TiO2 nanotubes and MAPbBr3 to make perovskite solar cells. in Program & Book of Abstracts / Second International Conference ELMINA 2022, Belgrade, Serbia, August 22nd-26th, 2022. 2022;:188-189.
https://hdl.handle.net/21.15107/rcub_dais_13636 .

Stefanović, Milica, Lukić, Ivana, Vujančević, Jelena, Petrović, Rada, Janaćković, Đorđe, "Improving the contact surface between TiO2 nanotubes and MAPbBr3 to make perovskite solar cells" in Program & Book of Abstracts / Second International Conference ELMINA 2022, Belgrade, Serbia, August 22nd-26th, 2022 (2022):188-189,
https://hdl.handle.net/21.15107/rcub_dais_13636 .

TY  - CONF
AU  - Stefanović, Milica
AU  - Lukić, Ivana
AU  - Vujančević, Jelena
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13591
AB  - Supercritical carbon dioxide (sCO2) is an ideal low-temperature cosolvent for perovskite deposition due to its relatively low critical point (31.2 °C, 73.8 bar), no surface tension, liquid-like density, gas-like viscosity, and diffusivity. It enables faster mass transfer which allows penetration of crystals in nanoporous structure. The study investigates the influence of time of deposition of perovskite assisted with supercritical carbon dioxide on the filling of nanotubes. Perovskite solar cell technology has been developed so fast due to several factors including a tunable band gap, high absorption coefficient, and low-cost fabrication. The quality of the perovskite film is important for the high efficiency of perovskite solar cells. Perovskite precursors are usually deposited from the solution onto a substrate using spin-coating followed by post-deposition treatments, but often it results in low-quality films that cannot provide good photovoltaic performances. Deposition of perovskite in the presence of sCO2 is a promising method for the formation of high-quality perovskite layers. In this work, methylammonium lead bromide perovskite (MAPbBr3) was deposited on TiO2 nanotubes from the solution in dimethylformamide (DMF) by application of sCO2 at 35 °C and 200 bar for 1 h, and 3 h. FESEM results show that TiO2 nanotubes were filled with perovskite material in both cases. The diffuse reflectance spectroscopy measurement of samples proved that the absorption edge of prepared TiO2 nanotubes/MAPbBr3 was extended to the visible range. Measurement of I-V characteristics showed that the sample made for 3 h had a higher value of current than the sample prepared for 1 h. The application of sCO2 during the deposition of perovskite has enabled the preparation of a photodiode with a better contact between TiO2 nanotubes and perovskite which is important for the future development of solar cells.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
T1  - Supercritical CO2 assisted deposition of MAPbBr3 perovskite onto TiO2 nanotubes
SP  - 73
EP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_dais_13591
ER  - 

@conference{
author = "Stefanović, Milica and Lukić, Ivana and Vujančević, Jelena and Petrović, Rada and Janaćković, Đorđe",
year = "2022",
abstract = "Supercritical carbon dioxide (sCO2) is an ideal low-temperature cosolvent for perovskite deposition due to its relatively low critical point (31.2 °C, 73.8 bar), no surface tension, liquid-like density, gas-like viscosity, and diffusivity. It enables faster mass transfer which allows penetration of crystals in nanoporous structure. The study investigates the influence of time of deposition of perovskite assisted with supercritical carbon dioxide on the filling of nanotubes. Perovskite solar cell technology has been developed so fast due to several factors including a tunable band gap, high absorption coefficient, and low-cost fabrication. The quality of the perovskite film is important for the high efficiency of perovskite solar cells. Perovskite precursors are usually deposited from the solution onto a substrate using spin-coating followed by post-deposition treatments, but often it results in low-quality films that cannot provide good photovoltaic performances. Deposition of perovskite in the presence of sCO2 is a promising method for the formation of high-quality perovskite layers. In this work, methylammonium lead bromide perovskite (MAPbBr3) was deposited on TiO2 nanotubes from the solution in dimethylformamide (DMF) by application of sCO2 at 35 °C and 200 bar for 1 h, and 3 h. FESEM results show that TiO2 nanotubes were filled with perovskite material in both cases. The diffuse reflectance spectroscopy measurement of samples proved that the absorption edge of prepared TiO2 nanotubes/MAPbBr3 was extended to the visible range. Measurement of I-V characteristics showed that the sample made for 3 h had a higher value of current than the sample prepared for 1 h. The application of sCO2 during the deposition of perovskite has enabled the preparation of a photodiode with a better contact between TiO2 nanotubes and perovskite which is important for the future development of solar cells.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022",
title = "Supercritical CO2 assisted deposition of MAPbBr3 perovskite onto TiO2 nanotubes",
pages = "73-73",
url = "https://hdl.handle.net/21.15107/rcub_dais_13591"
}

Stefanović, M., Lukić, I., Vujančević, J., Petrović, R.,& Janaćković, Đ.. (2022). Supercritical CO2 assisted deposition of MAPbBr3 perovskite onto TiO2 nanotubes. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
Belgrade : Materials Research Society of Serbia., 73-73.
https://hdl.handle.net/21.15107/rcub_dais_13591

Stefanović M, Lukić I, Vujančević J, Petrović R, Janaćković Đ. Supercritical CO2 assisted deposition of MAPbBr3 perovskite onto TiO2 nanotubes. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022. 2022;:73-73.
https://hdl.handle.net/21.15107/rcub_dais_13591 .

Stefanović, Milica, Lukić, Ivana, Vujančević, Jelena, Petrović, Rada, Janaćković, Đorđe, "Supercritical CO2 assisted deposition of MAPbBr3 perovskite onto TiO2 nanotubes" in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022 (2022):73-73,
https://hdl.handle.net/21.15107/rcub_dais_13591 .

TY  - CONF
AU  - Stefanović, Milica
AU  - Vujančević, Jelena
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12075
AB  - The organo-inorganic perovskites are materials that have recently revolutionized the field of
photovoltaics due to their low-cost fabrication and high optical absorption. The hybrid organoinorganic perovskite absorbs the visible part of the spectrum resulting in the creation of electron-hole pair. To decrease the recombination of charge carriers, the construction of solar cells requires the existence of separate layers for holes and for electrons. TiO2 is usually used as an electron transport layer because its conduction band (CB) lies under the CB of perovskite. In that way, electrons diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure was used as an electron transport layer due to its advantages compared to nanoparticular TiO2. TiO2 nanotubes can provide a one-dimensional transmission channel for the charge carriers, so it will reduce the recombination rate of the carriers and provide a channel for fast carrier transport. However, there is a problem with the contact surface between perovskite and TiO2 nanotubes. The aim of this study is to increase the contact surface of perovskite and TiO2 nanotubes by filling the nanotubes with perovskite material in order to improve electron transport. Methylammonium lead bromide perovskite (MAPbBr3) was deposited on anodically synthesized TiO2 nanotubes which were annealed at 450 °C for 1 h. After degassation of the sample under high vacuum for 3 h at 200 °C, the cooled sample was put in a solution of MAPbBr3 in dimethylformamide (DMF) and it was treated with inert gas (N2), which enabled the filling of the nanotubes with perovskite material to some extent. FESEM and XRD analyses were used for morphological and chemical characterization of the sample. The diffuse reflectance spectroscopy measurement of the sample proved that deposition of MAPbBr3 improves the absorption properties of TiO2 nanotubes. By measuring the I-V characteristics of the sample in the dark and under visible light, a hysteresis curve was obtained.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
T1  - Synthesis and deposition of MAPbBr3 perovskite on titania nanotube arrays
SP  - 111
EP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_dais_12075
ER  - 

@conference{
author = "Stefanović, Milica and Vujančević, Jelena and Petrović, Rada and Janaćković, Đorđe",
year = "2021",
abstract = "The organo-inorganic perovskites are materials that have recently revolutionized the field of
photovoltaics due to their low-cost fabrication and high optical absorption. The hybrid organoinorganic perovskite absorbs the visible part of the spectrum resulting in the creation of electron-hole pair. To decrease the recombination of charge carriers, the construction of solar cells requires the existence of separate layers for holes and for electrons. TiO2 is usually used as an electron transport layer because its conduction band (CB) lies under the CB of perovskite. In that way, electrons diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure was used as an electron transport layer due to its advantages compared to nanoparticular TiO2. TiO2 nanotubes can provide a one-dimensional transmission channel for the charge carriers, so it will reduce the recombination rate of the carriers and provide a channel for fast carrier transport. However, there is a problem with the contact surface between perovskite and TiO2 nanotubes. The aim of this study is to increase the contact surface of perovskite and TiO2 nanotubes by filling the nanotubes with perovskite material in order to improve electron transport. Methylammonium lead bromide perovskite (MAPbBr3) was deposited on anodically synthesized TiO2 nanotubes which were annealed at 450 °C for 1 h. After degassation of the sample under high vacuum for 3 h at 200 °C, the cooled sample was put in a solution of MAPbBr3 in dimethylformamide (DMF) and it was treated with inert gas (N2), which enabled the filling of the nanotubes with perovskite material to some extent. FESEM and XRD analyses were used for morphological and chemical characterization of the sample. The diffuse reflectance spectroscopy measurement of the sample proved that deposition of MAPbBr3 improves the absorption properties of TiO2 nanotubes. By measuring the I-V characteristics of the sample in the dark and under visible light, a hysteresis curve was obtained.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021",
title = "Synthesis and deposition of MAPbBr3 perovskite on titania nanotube arrays",
pages = "111-111",
url = "https://hdl.handle.net/21.15107/rcub_dais_12075"
}

Stefanović, M., Vujančević, J., Petrović, R.,& Janaćković, Đ.. (2021). Synthesis and deposition of MAPbBr3 perovskite on titania nanotube arrays. in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
Belgrade : Materials Research Society of Serbia., 111-111.
https://hdl.handle.net/21.15107/rcub_dais_12075

Stefanović M, Vujančević J, Petrović R, Janaćković Đ. Synthesis and deposition of MAPbBr3 perovskite on titania nanotube arrays. in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021. 2021;:111-111.
https://hdl.handle.net/21.15107/rcub_dais_12075 .

Stefanović, Milica, Vujančević, Jelena, Petrović, Rada, Janaćković, Đorđe, "Synthesis and deposition of MAPbBr3 perovskite on titania nanotube arrays" in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021 (2021):111-111,
https://hdl.handle.net/21.15107/rcub_dais_12075 .

TY  - CONF
AU  - Stefanović, Milica
AU  - Petrović, Rada
AU  - Lukić, Ivana
AU  - Vujančević, Jelena
AU  - Janaćković, Đorđe
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12273
AB  - Perovskite solar cells reached high efficiency in a short period. When perovskite was applied for the first time as photovoltaics, power conversion efficiency (PCE) was less than 3 %. Up to now, PCE is over 29 %. In perovskite solar cells, the perovskite layer is an active layer that absorbs the visible part of the spectrum. To reduce the recombination of charge carriers, the construction of solar cells requires the existence of layers for holes and electrons. TiO2 is usually used as an inorganic electron transport layer because its conduction band (CB) lies under the CB of perovskite, so electrons could diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure was used due to its advantages compared to nanoparticular TiO2. TiO2 nanotubes provide a one-dimensional transmission channel for the charge carriers which will reduce the recombination of the carriers and provide a fast carrier transport. The TiO2 nanotubes were synthesized by anodization of Ti foil after which they were annealed at 450 °C for 1 h. Their inner diameter was ~ 103 ± 17 nm while the length was ~ 350 nm. Methylammonium lead bromide perovskite (MAPbBr3) was deposited on TiO2 nanotubes from the solution in dimethylformamide (DMF) by application of supercritical carbon dioxide at 35 °C and different pressures (100, 200, and 300 bar). It has been observed that supercritical CO2 improves the filling of nanotubes by the perovskite due to its stronger solubilizing power at higher pressures. A perovskite photodiode with an improved contact surface between TiO2 and perovskite was made, which is the basis for future solar cell construction. I-V characteristics show that the highest value of photocurrent under visible light reached 400 μA for the sample which was obtained at 35 ° C and 300 bar for 1 h. The absorption edge of prepared TiO2 nanotubes/MAPbBr3, determined by diffuse reflectance spectroscopy, was extended to the visible range. FESEM and XRD analyses also were done.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia
T1  - Application of supercritical carbon dioxide for making perovskite photodiode
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_dais_12273
ER  - 

@conference{
author = "Stefanović, Milica and Petrović, Rada and Lukić, Ivana and Vujančević, Jelena and Janaćković, Đorđe",
year = "2021",
abstract = "Perovskite solar cells reached high efficiency in a short period. When perovskite was applied for the first time as photovoltaics, power conversion efficiency (PCE) was less than 3 %. Up to now, PCE is over 29 %. In perovskite solar cells, the perovskite layer is an active layer that absorbs the visible part of the spectrum. To reduce the recombination of charge carriers, the construction of solar cells requires the existence of layers for holes and electrons. TiO2 is usually used as an inorganic electron transport layer because its conduction band (CB) lies under the CB of perovskite, so electrons could diffuse from CB of perovskite to CB of TiO2. For these experiments, TiO2 nanotubular structure was used due to its advantages compared to nanoparticular TiO2. TiO2 nanotubes provide a one-dimensional transmission channel for the charge carriers which will reduce the recombination of the carriers and provide a fast carrier transport. The TiO2 nanotubes were synthesized by anodization of Ti foil after which they were annealed at 450 °C for 1 h. Their inner diameter was ~ 103 ± 17 nm while the length was ~ 350 nm. Methylammonium lead bromide perovskite (MAPbBr3) was deposited on TiO2 nanotubes from the solution in dimethylformamide (DMF) by application of supercritical carbon dioxide at 35 °C and different pressures (100, 200, and 300 bar). It has been observed that supercritical CO2 improves the filling of nanotubes by the perovskite due to its stronger solubilizing power at higher pressures. A perovskite photodiode with an improved contact surface between TiO2 and perovskite was made, which is the basis for future solar cell construction. I-V characteristics show that the highest value of photocurrent under visible light reached 400 μA for the sample which was obtained at 35 ° C and 300 bar for 1 h. The absorption edge of prepared TiO2 nanotubes/MAPbBr3, determined by diffuse reflectance spectroscopy, was extended to the visible range. FESEM and XRD analyses also were done.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia",
title = "Application of supercritical carbon dioxide for making perovskite photodiode",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_dais_12273"
}

Stefanović, M., Petrović, R., Lukić, I., Vujančević, J.,& Janaćković, Đ.. (2021). Application of supercritical carbon dioxide for making perovskite photodiode. in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 70-70.
https://hdl.handle.net/21.15107/rcub_dais_12273

Stefanović M, Petrović R, Lukić I, Vujančević J, Janaćković Đ. Application of supercritical carbon dioxide for making perovskite photodiode. in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia. 2021;:70-70.
https://hdl.handle.net/21.15107/rcub_dais_12273 .

Stefanović, Milica, Petrović, Rada, Lukić, Ivana, Vujančević, Jelena, Janaćković, Đorđe, "Application of supercritical carbon dioxide for making perovskite photodiode" in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia (2021):70-70,
https://hdl.handle.net/21.15107/rcub_dais_12273 .