The permanent electric dipole moment of nickel oxide, NiO

Kokkin, Damian L.; Dewberry, David R.; Steimle, Timothy C.

doi:10.1016/j.cplett.2014.06.027

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…These rate coefficients are determined using inverse Laplace transformation to link them directly to krec,. For these neutral reactions, krec, should be close to the typical capture rate coefficient with a small positive temperature dependence characteristic of a long-range potential governed by the dispersion and dipole-induced dipole force (the measured dipole moment of NiO is 4.43  0.04 D24 ). The density of states of the adduct is calculated using the Beyer Swinehart algorithm28 for the vibrational modes (without making a correction for anharmonicity) and a classical densities of states treatment for the rotational modes (the vibrational frequencies and rotational constants are listed in…”

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confidence: 99%

Kinetic Study of Ni and NiO Reactions Pertinent to the Earth’s Upper Atmosphere

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Kinetic Study of Ni and NiO Reactions Pertinent to the Earth’s Upper Atmosphere

et al. 2018

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“…The hysteresis loss was reduced in NiO x -based devices with EDA compared with the reference. Since hysteresis behavior occurs because of strong dipole moment generation due to the composition of NiO x (NiO and Ni 2 O 3 ), the optimized EDA alleviated the difference of the dipole moment between NiO x and perovskite according to the advantageous interfacial contact with the perovskite. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…Since hysteresis behavior occurs because of strong dipole moment generation due to the composition of NiO x (NiO and Ni 2 O 3 ), the optimized EDA alleviated the difference of the dipole moment between NiO x and perovskite according to the advantageous interfacial contact with the perovskite. 67,68 One of the hysteresis factors in perovskite photovoltaics is the defects (perovskite grain surface and boundaries) in the photoactive layer. 69 Therefore, SCLC (space charge limited current) analysis was performed to compare the charge trap density and hole mobility of the device (Figure S7a).…”

Section: Table 2 Photovoltaic Parameters Of Perovskite Solar Cells Wi...mentioning

confidence: 99%

Chelating Agent Mediated Sol–Gel Synthesis for Efficient Hole Extracted Perovskite Photovoltaics

et al. 2020

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Ethylenediamine (EDA, amine-based Lewis base) was utilized as a base catalyst in the synthesis of nickel oxide (NiO x ) to regulate the coordination properties of metal ions (Lewis acid). The effect of the EDA chelating agent on the hole transporting properties of NiO x was determined according to crystal field theory. The particle size in the NiO x thin film changed according to the EDA molar ratio, which influenced the electrical properties and affinity with the photoactive layer. Excellent electrical conductivity and improved crystallinity of the perovskite layer were confirmed via a conductive atomic force microscope (C-AFM), X-ray diffraction (XRD), and field emission scanning electron microscope (FE-SEM) analyses at the optimal EDA ratio in NiO x . In particular, UPS (reduced energy band offset) and charge dynamics data demonstrate the enhanced short circuit current, fill factor, and efficiency of the perovskite solar cells. Comprehensively, this study supports the role and effect of the EDA chelating agent in NiO x for next-generation solar cells. Moreover, it provides insight into the understanding and potential of various sol–gel materials synthesized based on crystal field theory.

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“…Furthermore, hysteresis effects have also been observed. It has been reported in the literature that such effects can manifest due to the composition of NiOx, which consists of NiO and Ni 2 O 3 , from which NiO is known to have strong dipole moment [ 31 ]. This can cause device limitations due to the appearance of surface dipoles in NiOx, which can attract perovskite precursor ions (e.g., CH 3 NH 3 + , I − , and Pb 2+ ) during the crystallization process and induce ionic vacancies and defects in the perovskite crystal.…”

Section: Introductionmentioning

confidence: 99%

Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

et al. 2020

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Inverted perovskite solar cells (PSCs) using a Cu:NiOx hole transporting layer (HTL) often exhibit stability issues and in some cases J/V hysteresis. In this work, we developed a β-alanine surface treatment process on Cu:NiOx HTL that provides J/V hysteresis-free, highly efficient, and thermally stable inverted PSCs. The improved device performance due to β-alanine-treated Cu:NiOx HTL is attributed to the formation of an intimate Cu:NiOx/perovskite interface and reduced charge trap density in the bulk perovskite active layer. The β-alanine surface treatment process on Cu:NiOx HTL eliminates major thermal degradation mechanisms, providing 40 times increased lifetime performance under accelerated heat lifetime conditions. By using the proposed surface treatment, we report optimized devices with high power conversion efficiency (PCE) (up to 15.51%) and up to 1000 h lifetime under accelerated heat lifetime conditions (60 °C, N2).

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The permanent electric dipole moment of nickel oxide, NiO

Cited by 8 publications

References 19 publications

Kinetic Study of Ni and NiO Reactions Pertinent to the Earth’s Upper Atmosphere

Kinetic Study of Ni and NiO Reactions Pertinent to the Earth’s Upper Atmosphere

Chelating Agent Mediated Sol–Gel Synthesis for Efficient Hole Extracted Perovskite Photovoltaics

Surface Treatment of Cu:NiOx Hole-Transporting Layer Using β-Alanine for Hysteresis-Free and Thermally Stable Inverted Perovskite Solar Cells

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