Dielectric relaxation of CH3NH3PbI3 thin film

Sheikh, Md. Sariful; Sakhya, Anup Pradhan; Dutta, Alo; Sinha, T. P.

doi:10.1016/j.tsf.2017.07.070

Cited by 23 publications

(24 citation statements)

References 40 publications

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“…It is worthwhile to mention that the complex electric modulus is formulated as where M ′ is the real part and M ″ is the imaginary part of complex M *, ω is defined as the angular frequency, M ∞ = 1/ε ∞ is the asymptotic value of M ′(ω), ϕ( t ) = exp[(− t /τ m )β] is the time evolution of the electric field, where β (0 < β < 1) is the stretched exponent and τ m is the conductivity relaxation time. − …”

Section: Results and Discussionmentioning

confidence: 99%

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Tailor

Satapathi

2021

J. Phys. Chem. C

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Photosensitive dielectric and conductivity relaxation was observed in all inorganic lead-free Cs3Bi2Cl9 perovskite single crystals. Using impedance and modulus spectroscopy in dark and with subsequent light-on and -off conditions, a reversible shift in modulus peak frequencies was observed. Relevant phenomenological methods based on modified Cole–Cole- and Debye-type relaxation models were applied to analyze the light-sensitive dielectric and conductivity behavior. The detailed analysis of this reversible change in modulus spectra confirms the light-induced trap-assisted reversible dipolar relaxation phenomena in Cs3Bi2Cl9 crystals. The conductivity follows Jonscher’s power law, and the value of power “n” was found to be ∼1, which further validates the Debye-type relaxation process. Our study provides an in-depth understanding and new insights into the dielectric and conductivity relaxation mechanism in perovskite single crystals, which motivates the future design of the perovskite single crystal-based energy storage devices.

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Section: Results and Discussionmentioning

confidence: 99%

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Tailor

Satapathi

2021

J. Phys. Chem. C

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“…They hypothesized that the LDC is induced by structural fluctuations in the local unit cell equilibrium because of photogenerated carriers. However, several studies have suggested that this anomalous LDC is attributed to ion migration and kinetics in HOIP materials. − The ε″– f spectra show ∼1/ f dependence at high frequency (∼100 Hz to 1 MHz) for all the devices and hence follow Jonscher’s power law (JPL) for the ionic conductivity in the hybrid perovskite materials which will be discussed in the next section.…”

Section: Resultsmentioning

confidence: 93%

Discerning the Role of an A-Site Cation and X-Site Anion for Ion Conductivity Tuning in Hybrid Perovskites by Photoelectrochemical Impedance Spectroscopy

2020

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Hybrid perovskite materials are mixed electronic–ionic conductors which enhance the complexity of conduction in these materials. Complete understanding of ionic conductivity along with electronic conductivity is crucial. Herein, we employed photoelectrochemical impedance spectroscopy on a perovskite/electrolyte interface-based device to investigate the role of an A-site cation and X-site halide ion in dictating the charge and ionic conductivity of the perovskite material. It was noted that ionic conductivity of the perovskite material can be tuned either by changing the A-site cation (MA+/FA+) or by changing the X-site halide ion (I–/Br–). Photoinduced ionic conductivity can be significantly different (opposite) in different cation perovskites or different halide-based perovskites. Therefore, mixed-cation perovskites can be utilized to reduce photoinduced ion conductivity. Furthermore, very fine tuning is also possible by modulating with the external applied bias. The influence of ion accumulation and migration on the charge storage and transport property of the device is analyzed using vacancy hopping and the jump relaxation model. Ionic conductivity spectra revealed Jonscher’s law dependence in the mid- and low-frequency range with a constant plateau at high frequencies. It can be concluded that the interplay of ion migration and accumulation decides the resulting conduction and storage property of the complete device. These perovskite/electrolyte-based devices can therefore be promising candidates for electrolyte-gated perovskite field-effect transistors where switchable ion conductivity can be achieved either by photoexcitation or external electric field.

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“…For instance, previous reports on AC conductivity from nanocrystalline CsPbBr 3 thin films [ 21 ] show s 0.7 − 1.0 at room temperature and s 0.3 above 400 K, while another study [ 22 ] showed power as high as s 1.7 from cubic shape CsPbBr 3 particles of up to 3 µm. Other perovskites with optoelectronic applications like CH 3 NH 3 PbI 3 , [ 23 ] CH 3 NH 3 PbBr 3 , [23b] and CsPbI 3 microwires , [ 24 ] have also been found to follow Jonscher's conductivity power law. Interestingly, the separation between two frequency ranges with different s has also been reported previously, [23a] but in CH 3 NH 3 PbI 3 .…”

Section: Resultsmentioning

confidence: 99%

Characterization of Aerosol Deposited Cesium Lead Tribromide Perovskite Films on Interdigited ITO Electrodes

These

Khansur

Almora

et al. 2021

Adv Elect Materials

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Aerosol deposition (AD) is a promising additive manufacturing method to fabricate low‐cost, scalable films at room temperature, but has not been considered for semiconductor processing, so far. The successful preparation of cesium lead tribromide (CsPbBr3) perovskite films on interdigitated indium tin oxide (ITO) electrodes by means of AD is reported here. The 20–35 µm thick layers are dense and have good adhesion to the substrate. The orthorhombic Pnma crystal structure of the precursor powder was retained during the deposition process with no signs of defect formation. The formation of electronic defects by photoluminescence spectroscopy is investigated and found slightly increased carrier recombination from defect sites for AD films compared to the powder. A nonuniform defect distribution across the layer, presumably induced by the impact of the semiconducting grains on the hard substrate surface, is revealed. The opto‐electronic properties of AD processed semiconducting films is further tested by electrical measurements and confirmed good semiconducting properties and high responsivity for the films. These results demonstrate that AD processing of metal halide perovskites is possible for opto‐electronic device manufacturing on 3D surfaces. It is believed that this work paves the way for the fabrication of previously unimaginable opto‐electronic devices by additive manufacturing.

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Dielectric relaxation of CH3NH3PbI3 thin film

Cited by 23 publications

References 40 publications

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Discerning the Role of an A-Site Cation and X-Site Anion for Ion Conductivity Tuning in Hybrid Perovskites by Photoelectrochemical Impedance Spectroscopy

Characterization of Aerosol Deposited Cesium Lead Tribromide Perovskite Films on Interdigited ITO Electrodes

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Dielectric relaxation of CH3NH3PbI3 thin film

Cited by 23 publications

References 40 publications

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs3Bi2Cl9 Perovskite Single Crystals

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs3Bi2Cl9 Perovskite Single Crystals

Discerning the Role of an A-Site Cation and X-Site Anion for Ion Conductivity Tuning in Hybrid Perovskites by Photoelectrochemical Impedance Spectroscopy

Characterization of Aerosol Deposited Cesium Lead Tribromide Perovskite Films on Interdigited ITO Electrodes

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Product

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Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals

Photosensitive Dielectric and Conductivity Relaxation in Lead-Free Cs₃Bi₂Cl₉ Perovskite Single Crystals