Low ion migration and defect density MAPbX<sub>3</sub> single crystals grown at low temperature for X-ray detection

Li, Haibin; Zhang, Ziming; Jiang, Wei; Zhao, Chen; Di, Haipeng; Ren, Jiwei; Ou, Bing; Xiong, Ying; Liao, Feiyi; Zhao, Yiying

doi:10.1039/d3ta02016a

Cited by 4 publications

(1 citation statement)

References 56 publications

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“…where d is the crystallite size in nanometers; k is the shape factor constant, which is 0.89; β is the full width at half maximum in radians; λ is the wavelength of the X-rays, which is 0.124 nm for the incident synchrotron X-rays; and θ is the Bragg diffraction angle. [31] The FWHM of the as-prepared MAPbBr3 single crystals, crystals with 0.5wt% PEA and 2wt% PEA additives are 0.034°, 0.024° and 0.164°. The crystallite sizes are thus calculated to be 193nm, 273nm, and 40nm, respectively.…”

Section: Resultsmentioning

confidence: 93%

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Li,

Wang,

et al. 2024

Journal of Luminescence

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Section: Resultsmentioning

confidence: 93%

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Li,

Wang,

et al. 2024

Journal of Luminescence

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Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals

Papadopoulos,

Forslund,

Cottrell

et al. 2024

Advanced Physics Research

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Hybrid organic–inorganic perovskites (HOIPs) are promising candidates for next‐generation photovoltaic materials. However, there is a debate regarding the impact of interactions between the organic center and the surrounding inorganic cage on the solar cell's high diffusion lengths. It remains unclear whether the diffusion mechanism is consistent across various halide perovskite families and how light illumination affects carrier lifetimes. The focus is on ion kinetics of (CH3NH3)PbX3 (X = Br, Cl) perovskite halide single crystals. Muon spectroscopy (μ+SR)is employed to investigate the fluctuations and diffusion of ions via the relaxation of muon spins in local nuclear field environments. Within a temperature range of 30–340 K, ion kinetics are studied with and without white‐light illumination. The results show a temperature shift of the tetragonal‐orthorhombic phase transition on the illuminated samples, as an effect of increased organic molecule fluctuations. This relation is supported by density functional theory (DFT) calculations along the reduction of the nuclear field distribution width between the phase transitions. The analysis shows that, depending on the halide ion, the motional narrowing from H and N nuclear moments represents the molecular fluctuations. The results demonstrate the importance of the halide ion and the effect of illumination on the compound's structural stability and electronic properties.

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Ultralow Ion Migration and X‐Ray Response from Strong Dipole Moments in (Br‐EA)₂PbBr₄ Perovskite Single Crystals

Li,

Jiang,

et al. 2024

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Abstract2D hybrid perovskites composed of quantum‐well structures demonstrate immense potential in optoelectronics because of their unique combination of environmental stability and optoelectrical properties. However, improving electrical properties via quantum‐well engineering results in severe ion migration and inferior chemical stability. In this study, a novel strategy to avoid the above trade‐off between electrical properties and stability for modifying the electric field profile in perovskites through molecular design is proposed. To this end, ethylammonium (EA) cations are substituted with 2‐bromoethylamine (Br‐EA) cations and fabricate pure 2D perovskite (Br‐EA)2PbBr4 single crystals. The molecular dipole moments of the Br‐EA cations and induced electric field impart several novel features to the X‐ray response, including a ferro‐response current, reverse current, and super‐high Voc of 95 V. The resulting X‐ray detectors achieve a sensitivity of 540.7 µC Gyair−1 cm−2 with an extra 38.1% gained from local dipoles, an impressive limit of detection of 9.8 nGyair s−1, and an ultralow dark current drift of 3.69 × 10−8 nA cm−1 s−1 V−1 at −100 V. This study presents valuable insights into the novel effects of dipole moments of A‐site cations on the properties of perovskite materials and inspires further exploration of their potential applications.

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Low ion migration and defect density MAPbX₃ single crystals grown at low temperature for X-ray detection

Abstract: Defects and the ion migration in perovskite single crystals seriously degrade the performance of corresponding devices, regardless of the outstanding optoelectronic properties. In this work, we demonstrated that the ion...

Cited by 4 publications

References 56 publications

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals

Ultralow Ion Migration and X‐Ray Response from Strong Dipole Moments in (Br‐EA)₂PbBr₄ Perovskite Single Crystals

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Low ion migration and defect density MAPbX3 single crystals grown at low temperature for X-ray detection

Abstract: Defects and the ion migration in perovskite single crystals seriously degrade the performance of corresponding devices, regardless of the outstanding optoelectronic properties. In this work, we demonstrated that the ion...

Cited by 4 publications

References 56 publications

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Passivation of defective states in single crystal MAPbBr3 and their optoelectronic properties study

Photophysical Ion Dynamics in Hybrid Perovskite MAPbX3 (X=Br, Cl) Single Crystals

Ultralow Ion Migration and X‐Ray Response from Strong Dipole Moments in (Br‐EA)2PbBr4 Perovskite Single Crystals

Contact Info

Product

Resources

About

Low ion migration and defect density MAPbX₃ single crystals grown at low temperature for X-ray detection

Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals

Ultralow Ion Migration and X‐Ray Response from Strong Dipole Moments in (Br‐EA)₂PbBr₄ Perovskite Single Crystals