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Papers by Dr Biplab Chatterjee
The Journal of Physical Chemistry C
AIP Conference Proceedings
The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials t... more The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials to take the center stage thus leading to a plethora of interesting results. Here, via a facile room-temperature synthesis protocol high quality cesium lead halide perovskite (CsPbBr2Cl) cubes has been realized. Surface morphology and crystallinity of the synthesized sample were investigated by FESEM and XRD respectively. To attain detail information of its chemical composition EDX analysis and elemental mapping were carried out. These single crystalline cubes crystallize in orthorhombic phase and exhibit strong photoluminescence emission at 482 nm with narrow FWHM value (∼18nm) and photoluminescence decay time of 10.44 ns. We believe, this facile synthesis protocol will pave the way for realization other perovskite cube and thereby their usage in several optoelectronic arena like as lasing, LEDs and photo detector etc.The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials to take the center stage thus leading to a plethora of interesting results. Here, via a facile room-temperature synthesis protocol high quality cesium lead halide perovskite (CsPbBr2Cl) cubes has been realized. Surface morphology and crystallinity of the synthesized sample were investigated by FESEM and XRD respectively. To attain detail information of its chemical composition EDX analysis and elemental mapping were carried out. These single crystalline cubes crystallize in orthorhombic phase and exhibit strong photoluminescence emission at 482 nm with narrow FWHM value (∼18nm) and photoluminescence decay time of 10.44 ns. We believe, this facile synthesis protocol will pave the way for realization other perovskite cube and thereby their usage in several optoelectronic arena like as lasing, LEDs and photo detector etc.
Materials Today: Proceedings
Abstract Uniform sized, nano-cube shaped, all-inorganic perovskite CsPbBr3 nanocrystals are devel... more Abstract Uniform sized, nano-cube shaped, all-inorganic perovskite CsPbBr3 nanocrystals are developed via a facile room temperature surfactant-mediated emulsion approach. Powder X-ray diffraction (PXRD) is used to determine the orthorhombic phase. Field emission scanning electron microscope (FESEM) images are taken to investigate the morphology and size of the as-prepared sample. Elemental mapping is implemented by energy dispersive x-ray spectroscope (EDX) to confirm the stoichiometry of the CsPbBr3 samples. UV-visible spectra are recorded in reflectance mode and band gap (Eg) is estimated for the samples. The optical properties (band gap and photoluminescence behavior) of CsPbBr3 are enhanced significantly in nano cube sample as compared to the bulk CsPbBr3 sample.
ACS Applied Nano Materials
Going beyond much cultivated photovoltaic aspects of all inorganic lead halide perovskite, here w... more Going beyond much cultivated photovoltaic aspects of all inorganic lead halide perovskite, here we explored electron field emission of CsPbX3 nanorods, where X represents different halides, specifically Cl, Br, and I. Starting with room-temperature preparation of different perovskite nanorods, we examined their electron-emission behavior and found CsPbI3 as best electron emitter among the synthesized samples, which showed that low work function and high aspect ratio drove the best emission performance. Aspect ratios of the CsPbI3 nanorods were tailored via alteration of processing temperature. Nanorods prepared at 90 °C possessing maximum aspect ratio delivered a current density of 133 μA/cm2 at 8 V/μm applied external field. With an expectation of gaining better emission performance from as-synthesized optimized nanorods, reduced graphene oxide (rGO) was further attached to them. Relying on the emission beneficial electronic features of rGO as-prepared CsPbI3-rGO composite delivered significantly improve...
AIP Conference Proceedings
All inorganic perovskites with different halide constituent have recently truncated the eyes of r... more All inorganic perovskites with different halide constituent have recently truncated the eyes of researchers owing to their intriguing optoelectronic features and thereby their usage perspective in photovoltaic applications, light emitting didoes and lasing devices. Here, adopting a simple, environment benign ambient conditioned chemical synthesis approach we have realized high quality cesium lead halide perovskite (CsPbCl3) cube. The crystallinity and morphological characterizations were performed by X-ray diffraction and field emission scanning electron microscope measurements respectively while the chemical composition were examined via energy-dispersive X-ray spectroscopic measurement. The as synthesized cubes crystallized in cubic phase and exhibited intense photoluminescence emission at ∼418 nm with a small FWHM value and prolonged photoluminescence decay time∼41 ns. Besides photoluminescence, these cubes displayed strong cathodoluminescence also. Accelerating voltage dependent cathodoluminescence study showed discernable differences in luminescence behaviour. We expect this synthetic strategy to be promising as it can be easily scaled up to produce bulk quantity nanoforms of different inorganic perovskites in subtle manner for the realization of several types of nanoscale devices.All inorganic perovskites with different halide constituent have recently truncated the eyes of researchers owing to their intriguing optoelectronic features and thereby their usage perspective in photovoltaic applications, light emitting didoes and lasing devices. Here, adopting a simple, environment benign ambient conditioned chemical synthesis approach we have realized high quality cesium lead halide perovskite (CsPbCl3) cube. The crystallinity and morphological characterizations were performed by X-ray diffraction and field emission scanning electron microscope measurements respectively while the chemical composition were examined via energy-dispersive X-ray spectroscopic measurement. The as synthesized cubes crystallized in cubic phase and exhibited intense photoluminescence emission at ∼418 nm with a small FWHM value and prolonged photoluminescence decay time∼41 ns. Besides photoluminescence, these cubes displayed strong cathodoluminescence also. Accelerating voltage dependent cathodoluminescence st...
Journal of Materials Chemistry C
By adopting a facile, environmentally benign, solution phase method under ambient conditions, we ... more By adopting a facile, environmentally benign, solution phase method under ambient conditions, we have successfully synthesized all-inorganic cesium lead halide perovskite 1D rods.
ACS applied materials & interfaces, Jan 12, 2017
Chemically derived topological insulator Bi2Se3 nanoflake/Si nanowire (SiNWs) heterojunctions wer... more Chemically derived topological insulator Bi2Se3 nanoflake/Si nanowire (SiNWs) heterojunctions were fabricated employing all eco-friendly cost-effective chemical route for the first time. X-ray diffraction studies confirmed proper phase formation of Bi2Se3 nanoflakes. The morphological features of the individual components and time-evolved hybrid structures were studied using field emission scanning electron microscope. High resolution transmission electron microscopic studies were performed to investigate the actual nature of junction whereas elemental distributions at junction, along with overall stoichiometry of the samples were analyzed using energy dispersive X-ray studies. Temperature dependent current-voltage characteristics and variation of barrier height and ideality factor was studied between 50 and 300 K. An increase in barrier height and decrease in the ideality factor were observed with increasing temperature for the sample. The rectification ratio (I+/I-) for SiNWs subs...
Journal of Applied Physics, 2014
The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial n... more The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial nickel ferrite (NiFe2O4) nanomagnets are investigated. Major magnetic hysteresis loops are measured for the sample at temperatures over the range 5–280 K using a vibrating sample magnetometer. The high-field regimes of the hysteresis loops are modeled using the law of approach to saturation, based on the assumption that at sufficiently high field only direct rotation of spin-moment take place, with an additional forced magnetization term that is linear with applied field. The uniaxial anisotropy constant K is calculated from the fitting of the data to the theoretical equation. As temperature increases from 5 K to 280 K, a 49% reduction of K, accompanied by an 85% diminution of MS is observed. Remarkably, K is linearly proportional to MS2.6 in the whole temperature range violating the existing theoretical model by Callen and Callen. The unusual power-law behavior for the NiFe2O4 uniaxial nanomagnets is ascribed ...
The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial n... more The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial nickel ferrite (NiFe2O4) nanomagnets are investigated. Major magnetic hysteresis loops are measured for the sample at temperatures over the range 5–280 K using a vibrating sample magnetometer. The high-field regimes of the hysteresis loops are modeled using the law of approach to saturation, based on the assumption that at sufficiently high field only direct rotation of spin-moment take place, with an additional forced magnetization term that is linear with applied field. The uniaxial anisotropy constant K is calculated from the fitting of the data to the theoretical equation. As temperature increases from 5 K to 280 K, a 49% reduction of K, accompanied by an 85% diminution of MS is observed. Remarkably, K is linearly proportional to MS2.6 in the whole temperature range violating the existing theoretical model by Callen and Callen. The unusual power-law behavior for the NiFe2O4 uniaxial nanomagnets is ascribed ...
Dalton Transactions, 2014
The spherical assembly of nanoparticles induces a high degree of alignment of magnetic easy axis ... more The spherical assembly of nanoparticles induces a high degree of alignment of magnetic easy axis as compared to randomly oriented nanoparticles which increases the reduced remanence ensuing straightened hysteresis loop.
Journal of Magnetism and Magnetic Materials, 2014
Synthesis of Cu 1 À x Zn x Fe 2 O 4, (x ¼0.00, 0.02, 0.04 and 0.08) nanoparticles by a low-temper... more Synthesis of Cu 1 À x Zn x Fe 2 O 4, (x ¼0.00, 0.02, 0.04 and 0.08) nanoparticles by a low-temperature combustion method is achieved and its structural and magnetic characterizations are performed. X-ray powder diffraction (XRD) study and high resolution transmission electron microscope (HRTEM) images confirm the formation of single cubic phase of nanocrystalline copper ferrite. The inter-planar spacing (d) and particle size increases with increasing Zn content. Cation distribution of mixed spinel Cu 1 À x Zn x Fe 2 O 4 nanoparticles are estimated by Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and further verified by 57 Fe Mossbauer spectroscopy. Detailed magnetic properties are studied by means of Field Cooled (FC)-Zero Field Cooled (ZFC) magnetization measurements and hysteresis loops at various temperatures by the physical property measurement system (PPMS). A transition from superparamagnetic state to ferrimagnetic state is observed as the Zn concentration increases in Cu 1 À x Zn x Fe 2 O 4 nanoparticles. The temperature dependence of intrinsic magnetic parameters, i.e., coercivity (H C), saturation magnetization (M S), effective anisotropy constant (K eff) and paramagnetic susceptibility (χ p) of Cu 1 À x Zn x Fe 2 O 4 reveals the existence of low-temperature spin-glass-like state, which is more prominent for smaller particles and starts to disappear with increasing Zn concentration.
The Journal of Physical Chemistry C
AIP Conference Proceedings
The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials t... more The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials to take the center stage thus leading to a plethora of interesting results. Here, via a facile room-temperature synthesis protocol high quality cesium lead halide perovskite (CsPbBr2Cl) cubes has been realized. Surface morphology and crystallinity of the synthesized sample were investigated by FESEM and XRD respectively. To attain detail information of its chemical composition EDX analysis and elemental mapping were carried out. These single crystalline cubes crystallize in orthorhombic phase and exhibit strong photoluminescence emission at 482 nm with narrow FWHM value (∼18nm) and photoluminescence decay time of 10.44 ns. We believe, this facile synthesis protocol will pave the way for realization other perovskite cube and thereby their usage in several optoelectronic arena like as lasing, LEDs and photo detector etc.The recent resurgence of photovoltaic research has empowered all inorganic perovskite materials to take the center stage thus leading to a plethora of interesting results. Here, via a facile room-temperature synthesis protocol high quality cesium lead halide perovskite (CsPbBr2Cl) cubes has been realized. Surface morphology and crystallinity of the synthesized sample were investigated by FESEM and XRD respectively. To attain detail information of its chemical composition EDX analysis and elemental mapping were carried out. These single crystalline cubes crystallize in orthorhombic phase and exhibit strong photoluminescence emission at 482 nm with narrow FWHM value (∼18nm) and photoluminescence decay time of 10.44 ns. We believe, this facile synthesis protocol will pave the way for realization other perovskite cube and thereby their usage in several optoelectronic arena like as lasing, LEDs and photo detector etc.
Materials Today: Proceedings
Abstract Uniform sized, nano-cube shaped, all-inorganic perovskite CsPbBr3 nanocrystals are devel... more Abstract Uniform sized, nano-cube shaped, all-inorganic perovskite CsPbBr3 nanocrystals are developed via a facile room temperature surfactant-mediated emulsion approach. Powder X-ray diffraction (PXRD) is used to determine the orthorhombic phase. Field emission scanning electron microscope (FESEM) images are taken to investigate the morphology and size of the as-prepared sample. Elemental mapping is implemented by energy dispersive x-ray spectroscope (EDX) to confirm the stoichiometry of the CsPbBr3 samples. UV-visible spectra are recorded in reflectance mode and band gap (Eg) is estimated for the samples. The optical properties (band gap and photoluminescence behavior) of CsPbBr3 are enhanced significantly in nano cube sample as compared to the bulk CsPbBr3 sample.
ACS Applied Nano Materials
Going beyond much cultivated photovoltaic aspects of all inorganic lead halide perovskite, here w... more Going beyond much cultivated photovoltaic aspects of all inorganic lead halide perovskite, here we explored electron field emission of CsPbX3 nanorods, where X represents different halides, specifically Cl, Br, and I. Starting with room-temperature preparation of different perovskite nanorods, we examined their electron-emission behavior and found CsPbI3 as best electron emitter among the synthesized samples, which showed that low work function and high aspect ratio drove the best emission performance. Aspect ratios of the CsPbI3 nanorods were tailored via alteration of processing temperature. Nanorods prepared at 90 °C possessing maximum aspect ratio delivered a current density of 133 μA/cm2 at 8 V/μm applied external field. With an expectation of gaining better emission performance from as-synthesized optimized nanorods, reduced graphene oxide (rGO) was further attached to them. Relying on the emission beneficial electronic features of rGO as-prepared CsPbI3-rGO composite delivered significantly improve...
AIP Conference Proceedings
All inorganic perovskites with different halide constituent have recently truncated the eyes of r... more All inorganic perovskites with different halide constituent have recently truncated the eyes of researchers owing to their intriguing optoelectronic features and thereby their usage perspective in photovoltaic applications, light emitting didoes and lasing devices. Here, adopting a simple, environment benign ambient conditioned chemical synthesis approach we have realized high quality cesium lead halide perovskite (CsPbCl3) cube. The crystallinity and morphological characterizations were performed by X-ray diffraction and field emission scanning electron microscope measurements respectively while the chemical composition were examined via energy-dispersive X-ray spectroscopic measurement. The as synthesized cubes crystallized in cubic phase and exhibited intense photoluminescence emission at ∼418 nm with a small FWHM value and prolonged photoluminescence decay time∼41 ns. Besides photoluminescence, these cubes displayed strong cathodoluminescence also. Accelerating voltage dependent cathodoluminescence study showed discernable differences in luminescence behaviour. We expect this synthetic strategy to be promising as it can be easily scaled up to produce bulk quantity nanoforms of different inorganic perovskites in subtle manner for the realization of several types of nanoscale devices.All inorganic perovskites with different halide constituent have recently truncated the eyes of researchers owing to their intriguing optoelectronic features and thereby their usage perspective in photovoltaic applications, light emitting didoes and lasing devices. Here, adopting a simple, environment benign ambient conditioned chemical synthesis approach we have realized high quality cesium lead halide perovskite (CsPbCl3) cube. The crystallinity and morphological characterizations were performed by X-ray diffraction and field emission scanning electron microscope measurements respectively while the chemical composition were examined via energy-dispersive X-ray spectroscopic measurement. The as synthesized cubes crystallized in cubic phase and exhibited intense photoluminescence emission at ∼418 nm with a small FWHM value and prolonged photoluminescence decay time∼41 ns. Besides photoluminescence, these cubes displayed strong cathodoluminescence also. Accelerating voltage dependent cathodoluminescence st...
Journal of Materials Chemistry C
By adopting a facile, environmentally benign, solution phase method under ambient conditions, we ... more By adopting a facile, environmentally benign, solution phase method under ambient conditions, we have successfully synthesized all-inorganic cesium lead halide perovskite 1D rods.
ACS applied materials & interfaces, Jan 12, 2017
Chemically derived topological insulator Bi2Se3 nanoflake/Si nanowire (SiNWs) heterojunctions wer... more Chemically derived topological insulator Bi2Se3 nanoflake/Si nanowire (SiNWs) heterojunctions were fabricated employing all eco-friendly cost-effective chemical route for the first time. X-ray diffraction studies confirmed proper phase formation of Bi2Se3 nanoflakes. The morphological features of the individual components and time-evolved hybrid structures were studied using field emission scanning electron microscope. High resolution transmission electron microscopic studies were performed to investigate the actual nature of junction whereas elemental distributions at junction, along with overall stoichiometry of the samples were analyzed using energy dispersive X-ray studies. Temperature dependent current-voltage characteristics and variation of barrier height and ideality factor was studied between 50 and 300 K. An increase in barrier height and decrease in the ideality factor were observed with increasing temperature for the sample. The rectification ratio (I+/I-) for SiNWs subs...
Journal of Applied Physics, 2014
The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial n... more The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial nickel ferrite (NiFe2O4) nanomagnets are investigated. Major magnetic hysteresis loops are measured for the sample at temperatures over the range 5–280 K using a vibrating sample magnetometer. The high-field regimes of the hysteresis loops are modeled using the law of approach to saturation, based on the assumption that at sufficiently high field only direct rotation of spin-moment take place, with an additional forced magnetization term that is linear with applied field. The uniaxial anisotropy constant K is calculated from the fitting of the data to the theoretical equation. As temperature increases from 5 K to 280 K, a 49% reduction of K, accompanied by an 85% diminution of MS is observed. Remarkably, K is linearly proportional to MS2.6 in the whole temperature range violating the existing theoretical model by Callen and Callen. The unusual power-law behavior for the NiFe2O4 uniaxial nanomagnets is ascribed ...
The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial n... more The thermal variation of magnetic anisotropy (K) and saturation magnetization (MS) for uniaxial nickel ferrite (NiFe2O4) nanomagnets are investigated. Major magnetic hysteresis loops are measured for the sample at temperatures over the range 5–280 K using a vibrating sample magnetometer. The high-field regimes of the hysteresis loops are modeled using the law of approach to saturation, based on the assumption that at sufficiently high field only direct rotation of spin-moment take place, with an additional forced magnetization term that is linear with applied field. The uniaxial anisotropy constant K is calculated from the fitting of the data to the theoretical equation. As temperature increases from 5 K to 280 K, a 49% reduction of K, accompanied by an 85% diminution of MS is observed. Remarkably, K is linearly proportional to MS2.6 in the whole temperature range violating the existing theoretical model by Callen and Callen. The unusual power-law behavior for the NiFe2O4 uniaxial nanomagnets is ascribed ...
Dalton Transactions, 2014
The spherical assembly of nanoparticles induces a high degree of alignment of magnetic easy axis ... more The spherical assembly of nanoparticles induces a high degree of alignment of magnetic easy axis as compared to randomly oriented nanoparticles which increases the reduced remanence ensuing straightened hysteresis loop.
Journal of Magnetism and Magnetic Materials, 2014
Synthesis of Cu 1 À x Zn x Fe 2 O 4, (x ¼0.00, 0.02, 0.04 and 0.08) nanoparticles by a low-temper... more Synthesis of Cu 1 À x Zn x Fe 2 O 4, (x ¼0.00, 0.02, 0.04 and 0.08) nanoparticles by a low-temperature combustion method is achieved and its structural and magnetic characterizations are performed. X-ray powder diffraction (XRD) study and high resolution transmission electron microscope (HRTEM) images confirm the formation of single cubic phase of nanocrystalline copper ferrite. The inter-planar spacing (d) and particle size increases with increasing Zn content. Cation distribution of mixed spinel Cu 1 À x Zn x Fe 2 O 4 nanoparticles are estimated by Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and further verified by 57 Fe Mossbauer spectroscopy. Detailed magnetic properties are studied by means of Field Cooled (FC)-Zero Field Cooled (ZFC) magnetization measurements and hysteresis loops at various temperatures by the physical property measurement system (PPMS). A transition from superparamagnetic state to ferrimagnetic state is observed as the Zn concentration increases in Cu 1 À x Zn x Fe 2 O 4 nanoparticles. The temperature dependence of intrinsic magnetic parameters, i.e., coercivity (H C), saturation magnetization (M S), effective anisotropy constant (K eff) and paramagnetic susceptibility (χ p) of Cu 1 À x Zn x Fe 2 O 4 reveals the existence of low-temperature spin-glass-like state, which is more prominent for smaller particles and starts to disappear with increasing Zn concentration.