Interpretation of the giant dielectric constant in the single crystal of the CH3NH3PbBr3 perovskite

Bechir, Mohamed Ben; Almeshal, Abdelkareem; Dhaou, Mohamed Houcine

doi:10.1016/j.materresbull.2021.111723

Cited by 4 publications

(2 citation statements)

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“…In order to simplify the complexity, we investigated a single-crystal MAPbI 3 solar cell as a reference structure. The single-crystal MAPbI 3 device is 26 μm thick and shows the expected range of permittivity values . An example with different representations of the spectra is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

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Hysteresis and Its Correlation to Ionic Defects in Perovskite Solar Cells

Tammireddy,

Lintangpradipto,

Telschow

et al. 2024

J. Phys. Chem. Lett.

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Ion migration has been reported to be one of the main reasons for hysteresis in the current−voltage (J−V) characteristics of perovskite solar cells. We investigate the interplay between ionic conduction and hysteresis types by studying Cs 0.05 (FA 0.83 MA 0.17 ) 0.95 Pb-(I 0.9 Br 0.1 ) 3 triple-cation perovskite solar cells through a combination of impedance spectroscopy (IS) and sweep-rate-dependent J−V curves. By comparing polycrystalline devices to single-crystal MAPbI 3 devices, we separate two defects, β and γ, both originating from long-range ionic conduction in the bulk. Defect β is associated with a dielectric relaxation, while the migration of γ is influenced by the perovskite/hole transport layer interface. These conduction types are the causes of different types of hysteresis in J−V curves. The accumulation of ionic defects at the transport layer is the dominant cause for observing tunnel-diode-like characteristics in the J−V curves. By comparing devices with interface modifications at the electron and hole transport layers, we discuss the species and polarity of involved defects.

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Section: Resultsmentioning

confidence: 99%

“…The single-crystal MAPbI 3 device is 26 μm thick and shows the expected range of permittivity values. 40 An example with different representations of the spectra is shown in Figure 2 .…”

Section: Resultsmentioning

confidence: 99%