Evident Dielectric Relaxation in an Organic‐Inorganic Halide Perovskite

Huang, Xueqin; Tian, Gui Yun; Lu, Yan-Zi; Xu, Zhe-Kun; Wang, Zhong‐Xia; Liao, Wei‐Qiang

doi:10.1002/ejic.202100366

Cited by 6 publications

(6 citation statements)

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“…Along with the impedance response of perovskite materials, dielectric relaxation also plays an important role in the charge carrier dynamics and in different applications such as dielectric switch materials and electronic technology. 57 To collect information about the AC conduction mechanism and dielectric relaxation, modulus spectroscopy (derived from IS) was extensively used in oxide perovskites. Recently some articles appeared about the use of modulus spectroscopy in halide perovskite polycrystalline films.…”

Section: ■ Impedance Spectroscopy For Mhpscsmentioning

confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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Metal halide perovskite single crystals (MHPSCs) are gaining enormous attention in the energy research community due to their impressive responses both in optical sensing and in photovoltaics. The switching from polycrystalline to monocrystalline morphology, not only allows to maintain the outstanding properties that characterize perovskite materials, but also enhances them. However, the poor control over the thickness and size during growing methods leads to considerable differences between surface and bulk responses. Impedance spectroscopy (IS) has been revealed as a powerful technique to understand the kinetics governing polycrystalline perovskite materials. The ionic migration, trap states, and recombination mechanisms occurring in both bulk and surface of the MHPSCs, need to be analyzed in depth to exploit their full potential. Here, we highlight the importance of IS to further advance our knowledge about monocrystalline perovskite materials, bringing to the table the relevance of other small perturbation techniques to complement the IS.

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Section: ■ Impedance Spectroscopy For Mhpscsmentioning

confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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“…Organic–inorganic hybrid perovskite (e.g., CH 3 NH 3 PbI 3 )-based PSCs have attracted tremendous attention in the past few years [ 1 ]. Their exceptional power conversion efficiency (PCE) has driven the development of organic–inorganic halide perovskite solar cells [ 2 ]. Planar architectures of PSCs, which employ low-temperature-processable compact charge-transport layers, offer efficient, cost-effective, and facile processing [ 3 ] and have shown a certified PCE of 25.5% [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Ti3C2Tx-Modified PEDOT:PSS Hole-Transport Layer for Inverted Perovskite Solar Cells

et al. 2022

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PEDOT:PSS is a commonly used hole-transport layer (HTL) in inverted perovskite solar cells (PSCs) due to its compatibility with low-temperature solution processing. However, it possesses lower conductivity than other conductive polymers and metal oxides, along with surface defects, limiting its photovoltaic performance. In this study, we introduced two-dimensional Ti3C2Tx (MXene) as an additive in the PEDOT:PSS HTL with varying doping concentrations (i.e., 0, 0.03, 0.05, and 0.1 wt.%) to tune the electrical conductivity of PEDOT:PSS and to modify the properties of the perovskite film atop it. We noted that the grain size of the CH3NH3PbI3 (MAPI3) perovskite layer grown over an optimal concentration of MXene (0.03 wt.%)-doped PEDOT:PSS increased from 250 nm to 400 nm, reducing charge recombination due to fewer grain boundaries. Ultraviolet photoelectron spectroscopy (UPS) revealed increased work function (WF) from 4.43 eV to 4.99 eV with 0.03 wt.% MXene doping, making the extraction of holes easier due to a more favorable energy level alignment with the perovskite. Quantum chemical investigations based on density functional theory (DFT) were conducted at the ωB97XD/6-311++G(d,p) level of theory to provide more insight into the stability, bonding nature, and optoelectronic properties of the PEDOT:PSS–MXene system. The theoretical investigations revealed that the doping of PEDOT:PSS with Ti3C2Tx could cause a significant effect on the electronic properties of the HTL, as experimentally demonstrated by an increase in the electrical conductivity. Finally, the inverted PSCs employing 0.03 wt.% MXene-doped PEDOT:PSS showed an average power conversion efficiency (PCE) of 15.1%, up from 12.5% for a reference PSC employing a pristine PEDOT:PSS HTL. The champion device with a 0.03 wt.% MXene–PEDOT:PSS HTL achieved 15.5% PCE.

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“…Hybrid metal halide semiconductor crystal [2‐MPDA]SbI 5 shows a step‐like exceptional dielectric relaxation dielectric anomaly above phase transition temperature ( T s =192.7 K) due to the effect of small‐angle reorientation of the organic cations [6] . Recently, one‐dimensional (1D) organic‐inorganic halide perovskite with ABX 3 ‐type, ( N , N ‐Dimethylethylamine)CdCl 3 , which the dynamic change of cations plays a key role in both the dielectric real part and dielectric loss displaying obvious dielectric relaxation characteristics [7] . (1‐propyl‐3‐methylimidazolium)PbBr 3 undergoes two phase transition at 256 and 359 K, and the second phase transition is accompanied with a remarkable dielectric relaxation revealed by change of dielectric imaginary part under applied electric field [8] .…”

Section: Introductionmentioning

confidence: 99%

“…[6] Recently, one-dimensional (1D) organic-inorganic halide perovskite with ABX 3 -type, (N,N-Dimethylethylamine)CdCl 3 , which the dynamic change of cations plays a key role in both the dielectric real part and dielectric loss displaying obvious dielectric relaxation characteristics. [7] (1-propyl-3-methylimidazolium)PbBr 3 undergoes two phase transition at 256 and 359 K, and the second phase transition is accompanied with a remarkable dielectric relaxation revealed by change of dielectric imaginary part under applied electric field. [8] In addition, a handful of organicinorganic hybrid materials have been reported with dielectric relaxation behavior, such as 2,5-pyrrolidinedione-lithium(I) hybrid compound displays step-shaped dielectric relaxation behavior around 228 K ascribed from the twist motion of the pyrrolidine ligand and order-disorder motion of the counter ClO 4 À anions.…”

Section: Introductionmentioning

confidence: 99%

“…150 K are changed from 2.3652(7) to 3.0429(6) Å and ClÀ SbÀ Cl angles change between 83.204(21)°and 92.43(3)°, revealing the distortion of the SbCl 5 quadrangular pyramid (Figure 2b, Table S1), which are almost the same as those at 293 K (2.3561(8)-3.0789(8) Å, 84.66(3)°-92.90(4)°). Each DIPEA + cation interacts with one corner-sharing Cl atom of SbCl 5 tetragonal pyramids via one hydrogen bonds with N•••Cl distances of 3.2235(24) Å and NÀ H•••Cl angles of 155.1(2)°in LT phase respectively, however, N•••Cl distances shorten to 3.1885(22) Å and NÀ H•••Cl angles change to 161.3(1)°in RT phase respectively, which are changed by À 2.0 % and 4.2 %, respectively (TableS1).…”

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confidence: 99%

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Dielectric Relaxation and Dielectric Switching Behaviors in (N,N‐Diisopropylethylamine) Tetrachloroantimonate(III)

Wei

Gao

Luo

et al. 2022

Chemistry A European J

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Dielectric switches have drawn renewed attention to the study of their many potential applications with the adjustable switch temperatures (Ts). Herein, a novel antimony‐based halide semiconductor, (N,N‐diisopropylethylamine) tetrachloroantimonate ((DIPEA)SbCl4, DIPEA+=N,N‐diisopropylethylamine), with dielectric relaxation behavior and dielectric switches has been successfully synthesized. This compound, consisting of coordinated anion []SbCl4∞- ${{\left[{{\rm S}{\rm b}{\rm C}{\rm l}}_{4}\right]}_{\infty }^{-}}$ chains and isolated DIPEA+ cations, undergoes an isostructural order‐disorder phase transition and shows a step‐like dielectric anomaly, which can function as a frequency‐tuned dielectric switch with highly adjustable switch temperature (Ts). Variable‐temperature single‐crystal structure analyses and first‐principles molecular dynamics simulations give information about the general mechanisms of molecular dynamics. This work enriches the dielectric switch family and proves that hybrid metal halides are promising candidates for switchable physical or chemical properties.

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Evident Dielectric Relaxation in an Organic‐Inorganic Halide Perovskite

Cited by 6 publications

References 44 publications

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Ti3C2Tx-Modified PEDOT:PSS Hole-Transport Layer for Inverted Perovskite Solar Cells

Dielectric Relaxation and Dielectric Switching Behaviors in (N,N‐Diisopropylethylamine) Tetrachloroantimonate(III)

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