Electrochemical characterization of halide perovskites: Stability &amp; doping

Jha, Sauraj; Hasan, Mehedhi; Khakurel, Nischal; Ryan, Conor; McMullen, Reema; Mishra, Aditya; Malko, Anton V.; Zakhidov, Alex; Slinker, Jason D.

doi:10.1016/j.mtadv.2022.100213

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…To further evaluate the stability theoretically, electrochemical characterization was applied to elucidate the fundamental energetics of the halide perovskites. Voltammetry and impedance spectroscopy can reveal the frontier and excited state orbitals, defect and doped states, density of states, electron–hole transfer rate, conductivity, dielectric constants, and more . Besides, CV can also be used to evaluate the stability of substances.…”

Section: Resultsmentioning

confidence: 99%

“…Voltammetry and impedance spectroscopy can reveal the frontier and excited state orbitals, defect and doped states, density of states, electron–hole transfer rate, conductivity, dielectric constants, and more. 38 Besides, CV can also be used to evaluate the stability of substances. Therefore, electrochemical tests were performed in a three-electrode system, in which a glassy carbon electrode was coated with (iso-BA) 2 PbI 4 with silver gel used as the working electrode, a Ag/AgCl electrode used as the reference electrode, and a platinum sheet used as the counter electrode ( Figure 2 a).…”

Section: Resultsmentioning

confidence: 99%

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Stable and Highly Efficient Photocatalysis with Two-Dimensional Organic–Inorganic Hybrid Perovskites

Wang,

Zhang,

Liu

et al. 2024

ACS Omega

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Two-dimensional organic−inorganic hybrid perovskites (OIHPs) have excellent photoelectric properties, such as high charge mobility and a high optical absorption coefficient, which have attracted enormous attention in the field of optoelectronic devices and photochemistry. However, the stability of 2D OIHPs in solution is deficient. In particular, the lack of stability in polar solutions hinders their application in photochemistry. In this work, (iso-BA) 2 PbI 4 was used as a model to explore the three possibilities of the stable existence of a 2D perovskite in aqueous solution. And two of these systems that stabilize the presence of (iso-BA) 2 PbI 4 were further investigated through electrochemical testing. Moreover, (iso-BA) 2 PbI 4 2D hybrid perovskites exhibited an outstanding degradation rate. The chiral perovskite (R/S-MBA) 2 PbI 4 is able to degrade a 30 mg/L methyl orange solution completely within 5 min, making it one of the fastest catalysts for this particular organic reaction. Further, based on the electron spin resonance test, a degradation mechanism by the halide perovskite was proposed. Based on the great catalytic performance as well as good reusability and stability, (R/S-MBA) 2 PbI 4 perovskites are expected to be a new generation of catalysts, making a great impact on the application of asymmetrically catalyzed photoreactions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Stable and Highly Efficient Photocatalysis with Two-Dimensional Organic–Inorganic Hybrid Perovskites

Wang,

Zhang,

Liu

et al. 2024

ACS Omega

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“…An increasingly attractive application for halide perovskites beyond photovoltaics is electrochemistry (EC) and photoelectrochemistry (PEC), where properties such as long carrier diffusion, tunable band edge positions, and band gap should enable design of new, effective electrode materials, which can be used for solar energy capture or for driving chemical transformations. − EC and PEC reactions have been carried out in aqueous and nonaqueous electrolytes using perovskites such as CsPbBr 3 and MAPbI 3 , Cs 2 PtBr 6 , and Cs 2 PtI 6 . , CsPbBr 3 nanoparticles showed promise for electrochemical conversion of organic molecules, while Cs 2 PtI 6 formed useful heterojunctions with BiVO 4 allowing photogenerated charge separation . A common difficulty that is present in all these materials when used for EC or PEC is surface stability, both on initial contact with the electrolyte and under illumination and applied or photogenerated bias.…”

Section: Introductionmentioning

confidence: 99%

Solid Electrolyte Interphase Formation in Tellurium Iodide Perovskites during Electrochemistry and Photoelectrochemistry

Liu

Yao

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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Halide perovskites are promising photoelectrocatalytic materials. Their further development requires understanding of surface processes during electrochemistry. Thin films of tellurium-based vacancy-ordered perovskites with formula A2TeI6, A = Cs, methylammonium (MA), were deposited onto transparent conducting substrates using aerosol-assisted chemical vapor deposition. Thin film stability as electrodes and photoelectrodes was tested in dichloromethane containing tetrabutylammonium PF6 (TBAPF6). Using photoemission spectroscopy, we show that the formation of a solid electrolyte interphase on the surface of the Cs2TeI6, consisting of CsPF6, enhances the stability of the electrode and allows extended chopped-light chronoamperometry measurements at up to 1.1 V with a photocurrent density of 16 μA/cm2. In contrast, (CH3NH3)2TeI6 does not form a passivating layer and rapidly degrades upon identical electrochemical treatment. This demonstrates the importance of surface chemistry in halide perovskite electrochemistry and photoelectrocatalysis.

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“…Perovskite photoactive thin films have been successfully fabricated via various approaches, i.e., chemical vapor deposition [ 13 ], mechanical exfoliation [ 14 ], electrochemical deposition [ 15 , 16 , 17 ], and spinning coating [ 18 ]. Alternative fabrication techniques allow the construction of heterostructures by introducing foreign low-dimensional materials, offering an efficient route for improving the optoelectronic response of the resulting perovskite thin films.…”

Section: Introductionmentioning

confidence: 99%

High Performance 0D ZnO Quantum Dot/2D (PEA)2PbI4 Nanosheet Hybrid Photodetectors Fabricated via a Facile Antisolvent Method

Liu

et al. 2022

Nanomaterials

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Two-dimensional (2D) organic−inorganic perovskites have great potential for the fabrication of next-generation photodetectors owing to their outstanding optoelectronic features, but their utilization has encountered a bottleneck in anisotropic carrier transportation induced by the unfavorable continuity of the thin films. We propose a facile approach for the fabrication of 0D ZnO quantum dot (QD)/2D (PEA)2PbI4 nanosheet hybrid photodetectors under the atmospheric conditions associated with the ZnO QD chloroform antisolvent. Profiting from the antisolvent, the uniform morphology of the perovskite thin films is obtained owing to the significantly accelerated nucleation site formation and grain growth rates, and ZnO QDs homogeneously decorate the surface of (PEA)2PbI4 nanosheets, which spontaneously passivate the defects on perovskites and enhance the carrier separation by the well-matched band structure. By varying the ZnO QD concentration, the Ion/Ioff ratio of the photodetectors radically elevates from 78.3 to 1040, and a 12-fold increase in the normalized detectivity is simultaneously observed. In addition, the agglomeration of perovskite grains is governed by the annealing temperature, and the photodetector fabricated at a relatively low temperature of 120 °C exhibits excellent stability after a 50-cycle test in the air condition without any encapsulation.

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Electrochemical characterization of halide perovskites: Stability & doping

Cited by 6 publications

References 32 publications

Stable and Highly Efficient Photocatalysis with Two-Dimensional Organic–Inorganic Hybrid Perovskites

Stable and Highly Efficient Photocatalysis with Two-Dimensional Organic–Inorganic Hybrid Perovskites

Solid Electrolyte Interphase Formation in Tellurium Iodide Perovskites during Electrochemistry and Photoelectrochemistry

High Performance 0D ZnO Quantum Dot/2D (PEA)2PbI4 Nanosheet Hybrid Photodetectors Fabricated via a Facile Antisolvent Method

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