Thermo-optical correlation for room temperature synthesis: cold-sintered lead halides

Kumar, Manish; Pawar, Vani; Jha, P. C.; Gupta, Saral K.; Sinha, A. S. K.; Jha, Pardeep K.; Singh, Prabhakar

doi:10.1007/s10854-019-00908-x

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…In addition, it was observed that the Cs 3d doublet changes its binding energy (BE) depending on the type of perovskite. For H-I-MHP, these peaks were shifted to lower BEs by increasing the iodide content, which was ascribed to the substitution of Br – with I – into the Cs-(PbX 6 ) octahedra . Conversely, the opposite trend was evidenced for A-E-MHP, where the BE of Cs 3d doublet was displaced to higher values by reducing the Br/I ratio.…”

Section: Resultsmentioning

confidence: 93%

“…For H-I-MHP, these peaks were shifted to lower BEs by increasing the iodide content, which was ascribed to the substitution of Brwith Iinto the Cs-(PbX 6 ) octahedra. 42 Conversely, the opposite trend was evidenced for A-E-MHP, where the BE of Cs 3d doublet was displaced to higher values by reducing the Br:I ratio. Here, the added Icontent…”

Section: Morphology and Photophysical Features Of Hot-injection And Amentioning

confidence: 94%

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Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Gualdrón‐Reyes

Rodríguez‐Pereira

González

et al. 2019

ACS Appl. Mater. Interfaces

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Within the most mesmerizing materials in the world of optoelectronics, mixed halide perovskites (MHP) have been distinguished due to the tunability of their optoelectronic properties, balancing both the light harvesting efficiency and charge extraction into highly efficient solar devices. This feature has drawn the attention of analogous hot-topics as photocatalysis for carrying out more efficiently the degradation of organic compounds. However, the photo-oxidation ability of perovskite does not only depend on its excellent light-harvesting properties, but also on the surface chemical environment provided during its synthesis. Accordingly, we studied the role of surface chemical states of MHP based nanocrystals (NCs) synthesized by hot-injection (H-I) and anion-exchange (A-E) approaches, on their photocatalytic (PC) activity for the oxidation of β-naphthol as a model system. We concluded that iodide vacancies are the main surface chemical states that facilitate the formation of superoxide ions, O 2 •─ , responsible for the PC activity in A-E-MHP. Conversely, the PC performance of H-I-MHP is related to the appropriate balance between band gap and a highly oxidizing valence band. This work offers new insights on the surface properties of MHP related to their catalytic activity in photochemical applications.

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Section: Resultsmentioning

confidence: 93%

Section: Morphology and Photophysical Features Of Hot-injection And Amentioning

confidence: 94%

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Gualdrón‐Reyes

Rodríguez‐Pereira

González

et al. 2019

ACS Appl. Mater. Interfaces

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“…[6][7][8] It has high absorption coefficient, long diffusion lengths and low exciton binding energy (E b ). [9][10][11][12][13][14] As a result of these superior properties, perovskite-based solar cells (PSCs) achieve power conversion efficiency (PCE) exceeding 25%. [15] The perovskite's structure is ABX 3 where A is an organic/ inorganic cation, B is a divalent metal ion (e.g., Cu 2þ , Mn 2þ, Sn 2þ , and Pb 2þ, ), and X is a halide (Cl À , Br À , or I À ).…”

Section: Introductionmentioning

confidence: 99%

“…[ 6–8 ] It has high absorption coefficient, long diffusion lengths and low exciton binding energy ( E b ). [ 9–14 ] As a result of these superior properties, perovskite‐based solar cells (PSCs) achieve power conversion efficiency (PCE) exceeding 25%. [ 15 ]…”

Section: Introductionmentioning

confidence: 99%

Ruddlesden–Popper 2D Chiral Perovskite‐Based Solar Cells

2022

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In this work, 2D chiral perovskite is demonstrated, where the barrier molecules are the two enantiomers (R)‐(+)‐α‐Methylbenzylamine (R‐MBA) and (S)‐(‐)‐α‐Methylbenzylamine (S‐MBA). The chirality is manifested at high χ values and pure 2D structure measured by circular dichroism (CD) (where the perovskite general formula is ABX3 χ (S/R‐MBA)2PbI4, χ is the ratio of the barrier molecule to the small cation (A+)). The anisotropy factor (gabs) decreased by an order of magnitude when decreasing the χ value achieving 0.0062 for pure 2D. Ab initio many‐body perturbation theory successfully describes the bandgaps, absorbance, and CD measurements. For the first time, these quasi‐2D chiral perovskites are integrated into the solar cell. Using circular polarization (CP) and cutoff filter, the chirality effect from the solar cells photovoltaic response is able to be distinguished. It is revealed that at high χ values, the chirality affects the current density of the solar cell more than at low χ values while the open‐circuit voltage didn't change. These chiral 2D perovskite are new class of materials which open the way for polarized hybrid perovskite.

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“…Unlike other inorganic halides viz, CsPbI 3 and CsPbBr 3 , CuPbI 3 is a lesser known material with unclear structural features [24,25]. We have synthesized CuPbI 3 polycrystalline samples by cold-sintering solid state reaction technique, as well known perovskite halides synthesized through this technique are found to be stable than other synthesis techniques [28][29][30]. Here, we have increased the sintering temperature to vary the grain size to understand the effect on polarization with the alteration in LO phonons.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis in centrosymmetric CuPbI₃ perovskite halide: apolar dielectric or orientable dielectric?

Bharti

Jha

et al. 2021

J. Phys.: Condens. Matter

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We demonstrated the change in polarization behaviour at the surface/interface before and after light through Havriliak–Negami equation of lesser known CuPbI3. We have synthesized CuPbI3 through cold sintering technique and the polarization mechanisms are altered by increasing (cold) sintering temperature. The structure of CuPbI3 was not known and we predicted it to be hexagonal (R 3 ̄ m) with 21R prototype representation. The hysteresis is reported to be affected by ferroelectricity (reorientable dipoles with non-centrosymmetry), to inspect this a centrosymmetric CuPbI3 is taken. In spite of centrosymmetry, we observed that the hysteresis area and shape of IV curve in AM 1.5 G sunlight shows the drastic variation with the change in polarization behaviour. Our experimental results suggest that apolar dielectric behaviour is the cause of I–V hysteresis rather than robust ferroelectric polarization (which was absent in the present case).

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Thermo-optical correlation for room temperature synthesis: cold-sintered lead halides

Cited by 14 publications

References 32 publications

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Ruddlesden–Popper 2D Chiral Perovskite‐Based Solar Cells

Hysteresis in centrosymmetric CuPbI₃ perovskite halide: apolar dielectric or orientable dielectric?

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Thermo-optical correlation for room temperature synthesis: cold-sintered lead halides

Cited by 14 publications

References 32 publications

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Ruddlesden–Popper 2D Chiral Perovskite‐Based Solar Cells

Hysteresis in centrosymmetric CuPbI3 perovskite halide: apolar dielectric or orientable dielectric?

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Hysteresis in centrosymmetric CuPbI₃ perovskite halide: apolar dielectric or orientable dielectric?