Field emission properties and strong localization effect in conduction mechanism of nanostructured perovskite LaNiO3

Kamble, Ramesh B.; Tanty, Narendra; Patra, Ananya; Prasad, V.

doi:10.1063/1.4961312

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…For this purpose, the work function of this material was tested using a UPS equipment, and the Fermi energy level, E F = 3.88 eV, was estimated using a linear extrapolation method, as shown in Figure a . Meanwhile, the valence-band maximum was calculated as 4.95 eV from the UPS spectrum, consistent with the reference value in the classical literature. − Moreover, the energy band gap of LNO film can be obtained from the absorption spectra based on h ν–( Ah ν) x characteristic curves, as shown in Figure b . Here, A , h , and ν are the absorption coefficient, Planck constant, and frequency, respectively.…”

Section: Resultsmentioning

confidence: 79%

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Shang

et al. 2020

ACS Appl. Mater. Interfaces

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In this study, a novel metal oxide, lanthanum nickelate (LNO) with a perovskite structure, was introduced into a polymer solar cell (PSC) device, replacing the PEDOT:PSS hole transport layer (HTL). The results show that the LNO-based PTB7-Th:PC 71 BM solar cell exhibits a higher circuit current density, power conversion efficiency, and stability compared with a device with PEDOT:PSS HTL. To understand the effect of LNO HTL on the performance of devices, the active layer morphology and charge transport characteristics in PSCs were systematically analyzed. The morphology of active layer was affected by the HTL, which further regulated the generation and transport processes of charge carrier in the PSC device. For the LNO HTL, an appropriate thickness (8 nm) and a small surface roughness (S q = 0.7 nm) can coordinate the energy-level structure of device and improve the interface contact between the FTO electrode and PTB7-Th:PC 71 BM active layer, promoting the charge transport performance of device. Therefore, this work provides a new consideration for the preparation of efficient, stable, and low-cost polymer solar cells.

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Section: Resultsmentioning

confidence: 79%

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Shang

et al. 2020

ACS Appl. Mater. Interfaces

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“…However, it does not appear for pure LNO. According to earlier reports, the resistivity upturn for LNO thin film is caused due to the weak localization [33] whereas for polycrystalline film [34] or nanostructured LNO [35], the Anderson localization dominates at the grain boundaries. Therefore the absence of upturn in pure LNO indicates the negligible effect of disorder induced localization on the electron conduction.…”

Section: Introductionmentioning

confidence: 99%

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Patra

Maity

Kamble

et al. 2018

J. Phys.: Condens. Matter

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We report the tuning from spin one channel to orbital two-channel Kondo (2CK) effect by varying CoFeO (CFO) content in the composites with LaNiO (LNO) along with the presence of ferrimagnetism. Although there is no signature of resistivity upturn in the case of pure LNO, all the composites exhibit a distinct upturn in the temperature range of 30-80 K. For composites with lower percentage of CFO (10%), the electron spin plays the key role in the emergence of resistivity upturn which is affected by external magnetic field. On the other hand, when the CFO content is increased (⩾15%), the upturn shows strong robustness against high magnetic field (⩽14 T) and a crossover in temperature variation from [Formula: see text] to T at the Kondo temperature, indicating the appearance of orbital 2CK effect. The orbital 2CK effect originates due to the scattering of conduction electrons from the structural two-level systems which is created at the interfaces between the two phases (LNO and CFO) of different crystal structures as well as inside the crystal planes. The specific heat data at low temperature (⩽40 K), deviates from the usual linear temperature variation of the electronic contribution. With higher CFO content it shows more deviation which also indicates the increasing amount of two-level system. A negative magnetoresistance (MR) is observed at low temperature (<30 K) for composites containing both lower (10%) and higher percentage (15%) of CFO. We have analyzed the negative MR using Khosla and Fisher semi-empirical model based on spin dependent scattering of conduction electrons from localized spins.

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“…The F–N plots which are mainly used to calculate the field enhancement factor (β) from the slopes can be represented by ignoring the correction factor λ M and ϑ F The field enhancement factor (β) can be measured by Figure b represents the corresponding F–N plots of both samples. The nonlinear characteristics in the mid- and low-frequency regions are a clear consequence of the semiconducting nature of field-emitting materials due to the presence of surface states and an innately definite number of charge carriers in the conduction band.…”

Section: Experimental Results and Discussionmentioning

confidence: 99%

Enhancement of Pseudocapacitive Behavior, Cyclic Performance, and Field Emission Characteristics of Reduced Graphene Oxide Reinforced NiGa₂O₄ Nanostructured Electrode: A First Principles Calculation to Correlate with Experimental Observation

et al. 2021

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The rational construction and design of supercapacitors (SCs) with electrochemically favorable structural configuration and appreciable cyclic performances are highly demanding. Herein, a novel Ga-based transition metal oxide, NiGa 2 O 4 , was synthesized via sol−gel self-ignition techniques to design an advanced electrode for supercapacitor and field emitter applications. Reitveld refinement of XRD, FTIR, and Raman spectra reveals a larger cubic parameter due to the incorporation of Ga over NiO, which promotes faster charge kinetics and various metal oxide (Ni−O and Ga−O) stretching vibrations in the molecular fingerprint. Reduced graphene oxide (r-GO) with an enlarged surface area has been utilized as a conductive substrate to prevent the aggregation of NiGa 2 O 4 nanoparticles. The NiGa 2 O 4 electrodes exhibit a specific capacitance of 415 F g −1 at a current density of 1.5 A g −1 with capacitance retention of 74.2% at a current density of 20 A g −1 , in addition to outstanding cyclic performance over 3000 cycles (capacitance retention = 96.2%). R-GO-reinforced NiGa 2 O 4 electrodes (10:1) possess a higher specific capacitance of 643 F g −1 at a current density of 1.5 A g −1 in comparison to pristine NiGa 2 O 4 with 77.66% retentivity at a current density of 20 A g −1 , together with upgraded cyclic stability of 99.1% retentivity over 3000 cycles. The NiGa 2 O 4 /rGO field emitter delivers a low turn-on field of 4.42 V/μm@1 μA/cm 2 with a long field emission current stability of over 5 h in comparison to pristine NiGa 2 O 4 (turn-on field of 6.56 V/μm@1 μA/cm 2 ), which recommends it as a potential field emitter (FE) for vacuum micro-and nanoelectronics. Various FE parameters with field enhancement factor (β) are compared with those of other efficient field emitters. Experimental data were supported through theoretical insight from density functional theory (DFT) simulations. Enhanced quantum capacitance and increased density of states near the Fermi level contribute toward superior charge storage performance in r-GO-reinforced NiGa 2 O 4 compared to pristine NiGa 2 O 4 . The interaction between NiGa 2 O 4 and rGO involves charge transfer from NiGa 2 O 4 to the C 2p orbital. In addition, the reduction in work function for the hybrid structure justifies its improved field emission properties.

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Field emission properties and strong localization effect in conduction mechanism of nanostructured perovskite LaNiO3

Cited by 14 publications

References 32 publications

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Enhancement of Pseudocapacitive Behavior, Cyclic Performance, and Field Emission Characteristics of Reduced Graphene Oxide Reinforced NiGa₂O₄ Nanostructured Electrode: A First Principles Calculation to Correlate with Experimental Observation

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Field emission properties and strong localization effect in conduction mechanism of nanostructured perovskite LaNiO3

Cited by 14 publications

References 32 publications

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO3 Layer

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO3 Layer

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO3 and CoFe2O4

Enhancement of Pseudocapacitive Behavior, Cyclic Performance, and Field Emission Characteristics of Reduced Graphene Oxide Reinforced NiGa2O4 Nanostructured Electrode: A First Principles Calculation to Correlate with Experimental Observation

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Product

Resources

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Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Enhanced Charge Transport in Conventional Polymer Solar Cells with a Perovskite-Type LaNiO₃ Layer

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Enhancement of Pseudocapacitive Behavior, Cyclic Performance, and Field Emission Characteristics of Reduced Graphene Oxide Reinforced NiGa₂O₄ Nanostructured Electrode: A First Principles Calculation to Correlate with Experimental Observation