Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

Gull, Sehrish; Jamil, M Haris; Zhang, Xiuwen; Kwok, Hoi‐Sing; Li, Guijun

doi:10.1002/open.202100285

Cited by 19 publications

(21 citation statements)

References 91 publications

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“…All peaks are slightly (~40 meV) red-shifted compared to their corresponding absorption spectra. We attribute this effect to different values of Stokes shift, which is likely to differ for materials with different levels of lattice strain and has been widely observed and reported in metal- halide perovskite materials ( 38 ). The signal from (R)- and (S)-3BrMBA 2 PbI 4 films (Fig.…”

Section: Resultsmentioning

confidence: 73%

Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskites

Liu,

Kepenekian,

Bodnar

et al. 2023

Sci. Adv.

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Hybrid perovskite semiconductor materials are predicted to lock chirality into place and encode asymmetry into their electronic states, while softness of their crystal lattice accommodates lattice strain to maintain high crystal quality with low defect densities, necessary for high luminescence yields. We report photoluminescence quantum efficiencies as high as 39% and degrees of circularly polarized photoluminescence of up to 52%, at room temperature, in the chiral layered hybrid lead-halide perovskites (R/S/Rac)-3BrMBA 2 PbI 4 [3BrMBA = 1-(3-bromphenyl)-ethylamine]. Using transient chiroptical spectroscopy, we explain the excellent photoluminescence yields from suppression of nonradiative loss channels and high rates of radiative recombination. We further find that photoexcitations show polarization lifetimes that exceed the time scales of radiative decays, which rationalize the high degrees of polarized luminescence. Our findings pave the way toward high-performance solution-processed photonic systems for chiroptical applications and chiral-spintronic logic at room temperature.

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Section: Resultsmentioning

confidence: 73%

Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskites

Liu,

Kepenekian,

Bodnar

et al. 2023

Sci. Adv.

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“…Despite having the absorption cutoff at 410–430 nm, the photoluminescence spectra show the large Stokes shift; the PL peaks occur near 525 nm wavelength, > 100 nm shift from absorption edge. The Stokes shift is defined as the difference between the absorption edge and the emission peak maxima 56 , resulting from the relaxation of the lattice around the excitation state 4 , As stated, the presence of Cs 4 PbX 6 phase in CsPbBr 3 may cause large Stokes shift 57 . In our case, large Stokes shift appears in all conditions due to dimensional confinement, and some literatures have reported its dependency on the low dimensional phase 18 , 58 – 61 .…”

Section: Resultsmentioning

confidence: 99%

Improving morphology and optoelectronic properties of ultra-wide bandgap perovskite via Cs tuning for clear solar cell and UV detection applications

Tun

Pansa-Ngat

Ruankham

et al. 2023

Sci Rep

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With growing population, vertical spaces from skyscrapers are vast. Semi-transparent solar cells enable an effective pathway for vertical energy harvesting. With composition tunability, perovskite materials can be designed with different transparencies and colors. In this work, an ultra-high bandgap layered triple cation perovskite system was developed for the first time to meet the demand of clear optoelectronic applications; low dimensional triple cation perovskite thin films were fabricated using perovskite with the formula (PEA)2(CsxMA0.61-xFA0.39)39(Pb)40(Cl0.88-0.32xBr0.12+0.32x)121, 0 ≤ x ≤ 0.02 with DMSO as the appropriate solvent. The absorption edge of the material is around 410–430 nm, achieving great transparency to visible light. The structural, optical, and photovoltaic performances of the clear perovskite materials are explored with the variation of Cs contents via CsBr. The relation between thickness, transparency, and optoelectronic properties of the clear perovskite materials along with other physical properties were investigated. The highest photovoltaic conversion efficiency (PCE) of clear perovskite solar cells with 1.5% Cs was achieved to be 0.69% under xenon lamp irradiation at 100 mW/cm2 (1.5 mW/cm2 of UVA within 100 mW/cm2) and 5.24% under 365 nm UV irradiation at 2.4 mW/cm2. Photoresponsivity, external quantum efficiency (EQE), and detectivity were also determined for photodetector applications.

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“…[42] The emission peak of PL spectra was just near the band edge of the absorption spectra with little anti-Stokes shift, indicating little vibronic relaxation within MAPbBr 3 nanoplates, which promised them a long electron-hole diffusion length and lifetime. [35,43] Figure S2, Supporting Information, is a Tauc plot of the absorption spectrum, and the calculated optical bandgap of MAPbBr 3 nanoplates was 2.2 eV. [25] To further investigate the carrier recombination dynamics of MAPbBr 3 nanoplates, we conducted a time-resolved PL decay measurement, as depicted in Figure 1h.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet‐Visible‐Short‐Wavelength Infrared Broadband and Fast‐Response Photodetectors Enabled by Individual Monocrystalline Perovskite Nanoplate

Mei

Zhang

Cui

et al. 2023

Small

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Perovskite‐based photodetectors exhibit potential applications in communication, neuromorphic chips, and biomedical imaging due to their outstanding photoelectric properties and facile manufacturability. However, few of perovskite‐based photodetectors focus on ultraviolet‐visible‐short‐wavelength infrared (UV–Vis–SWIR) broadband photodetection because of the relatively large bandgap. Moreover, such broadband photodetectors with individual nanocrystal channel featuring monolithic integration with functional electronic/optical components have hardly been explored. Herein, an individual monocrystalline MAPbBr3 nanoplate‐based photodetector is demonstrated that simultaneously achieves efficient UV–Vis–SWIR detection and fast‐response. Nanoplate photodetectors (NPDs) are prepared by assembling single nanoplate on adjacent gold electrodes. NPDs exhibit high external quantum efficiency (EQE) and detectivity of 1200% and 5.37 × 1012 Jones, as well as fast response with rise time of 80 µs. Notably, NPDs simultaneously achieve high EQE and fast response, exceeding most perovskite devices with multi‐nanocrystal channel. Benefiting from the high specific surface area of nanoplate with surface‐trap‐assisted absorption, NPDs achieve high performance in the near‐infrared and SWIR spectral region of 850–1450 nm. Unencapsulated devices show outstanding UV‐laser‐irradiation endurance and decent periodicity and repeatability after 29‐day‐storage in atmospheric environment. Finally, imaging applications are demonstrated. This work verifies the potential of perovskite‐based broadband photodetection, and stimulates the monolithic integration of various perovskite‐based devices.

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Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

Cited by 19 publications

References 91 publications

Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskites

Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskites

Improving morphology and optoelectronic properties of ultra-wide bandgap perovskite via Cs tuning for clear solar cell and UV detection applications

Ultraviolet‐Visible‐Short‐Wavelength Infrared Broadband and Fast‐Response Photodetectors Enabled by Individual Monocrystalline Perovskite Nanoplate

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