Dielectric properties of hybrid perovskites and drift-diffusion modeling of perovskite cells

Pédesseau, Laurent; Képénékian, Mikaël; Sapori, Daniel; Huang, Yong; Rolland, Alain; Beck, Alexandre; Cornet, Charles; Durand, Olivier; Wang, Hongtao; Katan, Claudine; Even, Jacky

doi:10.1117/12.2214007

Cited by 14 publications

(14 citation statements)

References 56 publications

(45 reference statements)

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“…The average in-plane component of ε 0 is estimated to be 9.3, much larger than its out-of-plane component of 4.4, as expected. These numbers agree well with the previously reported values (9.5 and 4.0) . As the halogen varies from Cl to I, the average dielectric constant increases (6.72, 6.86, and 7.63 for Cl, Br, and I, respectively).…”

supporting

confidence: 93%

“…As the halogen varies from Cl to I, the average dielectric constant increases (6.72, 6.86, and 7.63 for Cl, Br, and I, respectively). Clearly, the dielectric constants of the 2D perovskites are much smaller than those of the 3D counterparts (e.g., ε 0 = 22–37 in MAPbI 3 ). ,− In addition, we have calculated ε 0 for both orthorhombic and tetrahedral phases of MAPbI 3 and the results (20.63 and 22.72) agree well with the quoted values.…”

supporting

confidence: 78%

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Decreasing Exciton Binding Energy in Two-Dimensional Halide Perovskites by Lead Vacancies

Gao

Zhang

et al. 2019

J. Phys. Chem. Lett.

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perovskites, such as (BA) 2 (MA) n−1 Pb n X 3n+1 (X = Cl, Br, or I), have shown great promise in optoelectronic applications because of their stability, tunability, and unique electronic properties. However, their photovoltaic applications are hindered by high exciton binding energies in phases when n is small. On the basis of first-principles calculations, we predict that the exciton binding energy in the atomically thin 2D perovskites (n = 1 and 2) can be decreased significantly by neutral lead vacancies so that free charge carriers can be readily generated at room temperature. Moreover, the photogenerated electrons and holes are delocalized and spatially separated in the presence of lead vacancies; hence, radiative charge recombination can be suppressed. The lead vacancies are predicted to be formed in the 2D perovskites in an I-rich synthetic environment. Some intriguing experimental observations may be related to the presence of lead vacancies in the 2D perovskites.

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supporting

confidence: 93%

supporting

confidence: 78%

Decreasing Exciton Binding Energy in Two-Dimensional Halide Perovskites by Lead Vacancies

Gao

Zhang

et al. 2019

J. Phys. Chem. Lett.

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“…[ 27,28 ] Moreover, the external electric‐field‐polled pero‐SCs may accelerate the ion migration [ 29 ] or burn the perovskite layer at higher field intensities, owing to their relatively low dielectric constant. [ 23,30 ] Although attempts have been made to control the external electric field intensities to be within the dielectric breakdown strengths of the perovskites, by exactly calculating the per‐unit‐thickness applied external voltage, realizing such a small field with high repeatability is a considerable challenge. Therefore, it is necessary to develop a feasible strategy to permanently maintain the BEF contribution from the OFeMs, without applying an external electric field.…”

Section: Introductionmentioning

confidence: 99%

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Chen

Liu

et al. 2022

Advanced Materials

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The built‐in electric field (BEF) intensity of silicon heterojunction solar cells can be easily enhanced by selective doping to obtain high power conversion efficiencies (PCEs), while it is challenging for perovskite solar cells (pero‐SCs) because of the difficulty in doping perovskites in a controllable way. Herein, an effective method is reported to enhance the BEF of FA0.92MA0.08PbI3 perovskite by doping an organic ferroelectric material, poly(vinylidene fluoride):dabcoHReO4 (PVDF:DH) with high polarizability, that can be driven even by the BEF of the device itself. The polarization of PVDF:DH produces an additional electric field, which is maintained permanently, in a direction consistent with that of the BEF of the pero‐SC. The BEF superposition can more sufficiently drive the charge‐carrier transport and extraction, thus suppressing the nonradiative recombination occurring in the pero‐SCs. Moreover, the PVDF:DH dopant benefits the formation of a mesoporous PbI2 film, via a typical two‐step processing method, thereby promoting perovskite growth with high crystallinity and a few defects. The resulting pero‐SC shows a promising PCE of 24.23% for a 0.062 cm2 device (certified PCE of 23.45%), and a remarkable PCE of 22.69% for a 1 cm2 device, along with significantly improved moisture resistances and operational stabilities.

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“…Application of the Poisson equation allows us to extract the charge density (ρ) from the potential ( V ) during the discharging process. Here ε 0 and ε r denote the permittivity of free space and the relative static dielectric constant, respectively (we take ε r as 6 for our BA 2 PbI 4 ( n = 1) perovskite sample). The charge densities in the dark (Figure S7a) and under light illumination (Figure S7b) are calculated from the potential profiles shown in panels a and b of Figure , respectively.…”

mentioning

confidence: 99%

Scanning Kelvin Probe Microscopy Reveals That Ion Motion Varies with Dimensionality in 2D Halide Perovskites

et al. 2020

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We study ion migration in 2D lead halide perovskites of varying dimensionality using scanning Kelvin probe microscopy (SKPM). We perform potentiometry on micrometer-scale lateral junctions in the absence of injected charge, and we compare how ion motion varies between prototypical two-dimensional n-butylammonium lead iodide perovskites (BA 2 PbI 4 , n = 1), and methylammonium-incorporated quasi-2D perovskites (BA 2 MA 3 Pb 4 I 13 , ∼⟨n⟩ = 4) under the effects of illumination and temperature. We attribute the observed slow dynamics to relaxation of the bias-induced ionic charge distributions at different temperatures, and we extract the activation energies associated with the ionic motion in each case. Finally, we propose an explanation for these phenomena by hypothesizing that ion motion in purely-2D BA 2 PbI 4 perovskite films is dominated by paired halide and halide vacancy, whereas for quasi-2D BA 2 MA 3 Pb 4 I 13 perovskites, the ion motion is a combination of both halide and methylammonium (vacancy) migration. These data show that dimensionality in these systems plays a critical role in ion dynamics.

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Dielectric properties of hybrid perovskites and drift-diffusion modeling of perovskite cells

Cited by 14 publications

References 56 publications

Decreasing Exciton Binding Energy in Two-Dimensional Halide Perovskites by Lead Vacancies

Decreasing Exciton Binding Energy in Two-Dimensional Halide Perovskites by Lead Vacancies

High‐Polarizability Organic Ferroelectric Materials Doping for Enhancing the Built‐In Electric Field of Perovskite Solar Cells Realizing Efficiency over 24%

Scanning Kelvin Probe Microscopy Reveals That Ion Motion Varies with Dimensionality in 2D Halide Perovskites

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