Enhanced piezoelectric output performance via control of dielectrics in Fe2+-incorporated MAPbI3 perovskite thin films: Flexible piezoelectric generators

Ippili, Swathi; Jella, Venkatraju; Kim, Jaegyu; Hong, Seungbum; Yoon, Soon‐Gil

doi:10.1016/j.nanoen.2018.04.031

Cited by 73 publications

(53 citation statements)

References 38 publications

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“…Since the orientation of CH 3 NH 3 molecules depends on the hydrogen bonds it forms with iodides in octahedron [44], displacement of I due to lattice distortion may introduce a preferred orientation of CH 3 NH 3 molecules. In the literature, similar behavior in dielectric constant with dopant was (11) ε = ε 0 + P E reported for Fe 2+ doped CH 3 NH 3 PbI 3 films and the behavior was attributed to the creation of larger grains during the crystallization due to the high residual stress cause by the Fe 2+ dopants [45]. In contrast, the increase in the dielectric constant with increased Ba content, improves exciton separation, promoting free charges which is beneficial for solar cell performance, while reducing Pb content.…”

Section: Discussionsupporting

confidence: 64%

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

Jayathissa

Burns

2020

SN Appl. Sci.

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An understanding of the effects of doping in lead perovskites may allow for improved solar cell performance or reduction in toxicity of the materials used. Ba 2+ doped CH 3 NH 3 PbI 3 (CH 3 NH 3 Pb 1−x Ba x I 3 with x = 1%, 5% and 10%) are successfully synthesized by cooling down a concentrated aqueous solution containing HI, CH 3 NH 2 and metal acetates and their properties are investigated using x-ray diffraction, differential scanning calorimetry, and impedance spectroscopy (IS). No new structures are formed upon doping with Ba 2+ ions, however the lattice expands. The IS measurements show a strong increase in the conductivity and dielectric constants of the doped crystals. The conductivity arises mainly from vacancy mediated iodide ion (I −) migration and the increase in ionic conductivity with dopants is ascribed to increased defect formation due to lattice distortion. In addition, the bulk dielectric constant increases with increasing Ba 2+ dopant. The increase in the dielectric constant is consistent with ordering of CH 3 NH 3 dipoles resulting from distortions of the Ba sites in the lattice. The temperature dependence of the dielectric constants is attributed to thermal effects on the orientation of CH 3 NH 3 molecules.

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Section: Discussionsupporting

confidence: 64%

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

Jayathissa

Burns

2020

SN Appl. Sci.

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“…Strain can modulate the bandgap of MAPbI 3 and CsPbBr 3 . In addition, several reports have utilized the piezoelectric effect or the ferroelectricity of lead halide perovskites to fabricate micro–nano devices . Therefore, the piezoelectric polarization of lead halide perovskites can also be utilized in lasing applications.…”

mentioning

confidence: 99%

Controllable Growth of Aligned Monocrystalline CsPbBr₃ Microwire Arrays for Piezoelectric‐Induced Dynamic Modulation of Single‐Mode Lasing

Yang

Zhuge

et al. 2019

Advanced Materials

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Since the appearance of semiconductor solid-state lasers in the 1960s, [1] lasers have shown tremendous potential in various applications, such as data communication, medical treatment, environmental science, and military defense. Up to now, enormous research efforts have been conducted to develop high-quality semiconductor lasers. [2] Multiple-mode lasers suffer from false signaling, random fluctuation, and instability which hinder their practical applications. [3,4] Therefore, efforts to achieve single-mode lasers have drawn much attention due to the monochromaticity, high stability, controllable output wavelength, and great potential of these lasers in practical applications, such as in on-chip optical communication. [5] Thus far, most single-mode lasers have been realized in the following four ways: 1) decreasing the cavity size to enlarge the free spectral range (FSR); [6,7] 2) fabricating distributed Bragg reflector (DBR) mirror structures or distributed feedback (DFB) CsPbBr 3 shows great potential in laser applications due to its superior optoelectronic characteristics. The growth of CsPbBr 3 wire arrays with well-controlled sizes and locations is beneficial for cost-effective and largely scalable integration into on-chip devices. Besides, dynamic modulation of perovskite lasers is vital for practical applications. Here, monocrystalline CsPbBr 3 microwire (MW) arrays with tunable widths, lengths, and locations are successfully synthesized. These MWs could serve as high-quality whispering-gallery-mode lasers with high quality factors (>1500), low thresholds (<3 µJ cm −2 ), and long stability (>2 h). An increase of the width results in an increase of the laser quality and the resonant mode number. The dynamic modulation of lasing modes is achieved by a piezoelectric polarization-induced refractive index change. Single-mode lasing can be obtained by applying strain to CsPbBr 3 MWs with widths between 2.3 and 3.5 µm, and the mode positions can be modulated dynamically up to ≈9 nm by changing the applied strain. Piezoelectric-induced dynamic modulation of single-mode lasing is convenient and repeatable. This method opens new horizons in understanding and utilizing the piezoelectric properties of lead halide perovskites in lasing applications and shows potential in other applications, such as on-chip strain sensing.

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“…[2][3][4] However, whether or not OMH perovskites are ferroelectric materials or exhibit other ferroic properties, and which effects might result from these properties have been a subject of debate for several years. Claims included piezoelectricity, [15][16][17] pyroelectricity, [5] ferroelasticity, [9,12,18] antiferroelectricity [19] as well as ferroelectricity, [10,11,15,16,20] and the seemingly contradictory reports on these ferroic properties have heated up the discussion. Scanning microscopy techniques such as atomic force microscopy (AFM), [9][10][11][12] scanning electron microscopy (SEM), [13] and tunneling electron microscopy (TEM) [14] were extensively used in order to reveal the microstructure of OMH-perovskite thinfilm samples with subgrain resolution.…”

mentioning

confidence: 99%

“…A multitude of measurement techniques was employed in order to probe ferroic properties of single crystal samples, [5,6] pressed powder pellets, [7] and polycrystalline thin-films [8] of OMH perovskites. Claims included piezoelectricity, [15][16][17] pyroelectricity, [5] ferroelasticity, [9,12,18] antiferroelectricity [19] as well as ferroelectricity, [10,11,15,16,20] and the seemingly contradictory reports on these ferroic properties have heated up the discussion. Some of these studies revealed ordered domains within crystal grains, but no consensus has been reached about the interpretation of their ferroic and crystallographic origins.…”

mentioning

confidence: 99%

“…Some of these studies revealed ordered domains within crystal grains, but no consensus has been reached about the interpretation of their ferroic and crystallographic origins. Claims included piezoelectricity, [15][16][17] pyroelectricity, [5] ferroelasticity, [9,12,18] antiferroelectricity [19] as well as ferroelectricity, [10,11,15,16,20] and the seemingly contradictory reports on these ferroic properties have heated up the discussion. Techniques that probe large areas of specimens such as X-ray diffraction (XRD), [21] impedance spectroscopy, [22,23] and J-V characterization [5,7] added a rather spatially averaged picture of the samples' microstructure.…”

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confidence: 99%

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Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion

et al. 2019

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Yet, as of today, the microscopic origin of the remarkable charge carrier dynamics in perovskite solar cells remains unclear. An often proposed idea to explain the enhanced separation and transport of photogenerated charge carriers describes the formation of ferroelectric domains, i.e., domains with alternating polarization.Ferroelectric domains would provide local internal electric fields that assist with the separation of charge carriers and hence reduce recombination. [2][3][4] However, whether or not OMH perovskites are ferroelectric materials or exhibit other ferroic properties, and which effects might result from these properties have been a subject of debate for several years. A multitude of measurement techniques was employed in order to probe ferroic properties of single crystal samples, [5,6] pressed powder pellets, [7] and polycrystalline thin-films [8] of OMH perovskites. Scanning microscopy techniques such as atomic force microscopy (AFM), [9][10][11][12] scanning electron microscopy (SEM), [13] and tunneling electron microscopy (TEM) [14] were extensively used in order to reveal the microstructure of OMH-perovskite thinfilm samples with subgrain resolution. Some of these studies revealed ordered domains within crystal grains, but no consensus has been reached about the interpretation of their ferroic and crystallographic origins. Claims included piezoelectricity, [15][16][17] pyroelectricity, [5] ferroelasticity, [9,12,18] antiferroelectricity [19] as well as ferroelectricity, [10,11,15,16,20] and the seemingly contradictory reports on these ferroic properties have heated up the discussion. Techniques that probe large areas of specimens such as X-ray diffraction (XRD), [21] impedance spectroscopy, [22,23] and J-V characterization [5,7] added a rather spatially averaged picture of the samples' microstructure. For example, second harmonic generation (SHG) measurements were employed in order to identify whether or not OMH perovskites form polar crystals, but their interpretation led to ambiguous results. [5,24] In order to clarify some of the confusion and seemingly contradictory reports on the ferroic and, in particular, ferroelectric features of OMH perovskites, we review and discuss some of the fundamental properties of this material class and correlate them with our own observations on perovskite thin-films. We deliberately focus on the ferroic properties of archetypical methylammonium lead iodide (MAPbI 3 ), representing the class of light-harvesting perovskites.Whether or not methylammonium lead iodide (MAPbI 3 ) is a ferroelectric semiconductor has caused controversy in the literature, fueled by many misunderstandings and imprecise definitions. Correlating recent literature reports and generic crystal properties with the authors' experimental evidence, the authors show that MAPbI 3 thin-films are indeed semiconducting ferroelectrics and exhibit spontaneous polarization upon transition from the cubic high-temperature phase to the tetragonal phase at room temperature. The polarization is predomina...

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Enhanced piezoelectric output performance via control of dielectrics in Fe2+-incorporated MAPbI3 perovskite thin films: Flexible piezoelectric generators

Cited by 73 publications

References 38 publications

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

Controllable Growth of Aligned Monocrystalline CsPbBr₃ Microwire Arrays for Piezoelectric‐Induced Dynamic Modulation of Single‐Mode Lasing

Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion

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Enhanced piezoelectric output performance via control of dielectrics in Fe2+-incorporated MAPbI3 perovskite thin films: Flexible piezoelectric generators

Cited by 73 publications

References 38 publications

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

A study of structural and dielectric properties of Ba2+ doped CH3NH3PbI3 crystals

Controllable Growth of Aligned Monocrystalline CsPbBr3 Microwire Arrays for Piezoelectric‐Induced Dynamic Modulation of Single‐Mode Lasing

Ferroelectric Properties of Perovskite Thin Films and Their Implications for Solar Energy Conversion

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Controllable Growth of Aligned Monocrystalline CsPbBr₃ Microwire Arrays for Piezoelectric‐Induced Dynamic Modulation of Single‐Mode Lasing