Pressure Response of Photoluminescence in Cesium Lead Iodide Perovskite Nanocrystals

Beimborn, J. Curtis; Hall, Leah M. G.; Tongying, Pornthip; Duković, Gordana; Weber, J. Mathias

doi:10.1021/acs.jpcc.8b03280

Cited by 45 publications

(78 citation statements)

References 47 publications

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“…4a , inset). The pressure response is different from that observed in CsPbI 3 perovskite nanocrystals where the PL at first shifted to lower energies below 0.4 GPa and then to higher energies with further compression 38 , 39 . These differences could be caused by the different structures and particle sizes of the samples.…”

Section: Discussioncontrasting

confidence: 78%

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

et al. 2021

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Functional CsPbI3 perovskite phases are not stable at ambient conditions and spontaneously convert to a non-perovskite δ phase, limiting their applications as solar cell materials. We demonstrate the preservation of a black CsPbI3 perovskite structure to room temperature by subjecting the δ phase to pressures of 0.1 – 0.6 GPa followed by heating and rapid cooling. Synchrotron X-ray diffraction and Raman spectroscopy indicate that this perovskite phase is consistent with orthorhombic γ-CsPbI3. Once formed, γ-CsPbI3 could be then retained after releasing pressure to ambient conditions and shows substantial stability at 35% relative humidity. First-principles density functional theory calculations indicate that compression directs the out-of-phase and in-phase tilt between the [PbI6]4− octahedra which in turn tune the energy difference between δ- and γ-CsPbI3, leading to the preservation of γ-CsPbI3. Here, we present a high-pressure strategy for manipulating the (meta)stability of halide perovskites for the synthesis of desirable phases with enhanced materials functionality.

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Section: Discussioncontrasting

confidence: 78%

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

et al. 2021

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“…To carry out this calculation we use the pressure deformation potential for CsPbI3 nanocrystals measured in the literature 35 of αp = 1.4×10 -2 eV/GPa. We note that the pressure deformation potential and the volume deformation potential are related through the bulk modulus, B = -VdP/dV, as shown in Eq.…”

Section: ≡ = (S23)mentioning

confidence: 99%

Size-Dependent Lattice Structure and Confinement Properties in CsPbI₃ Perovskite Nanocrystals: Negative Surface Energy for Stabilization

et al. 2019

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(FA-acetate, 99%) were purchased from Sigma-Aldrich and used as received unless otherwise specified. CsPbI3 QD synthesis. The synthesis was performed following the method reported in our previous publications with slight modification. 1,2 First, 20 mL of ODE is mixed with 1.25 mL of OA containing 0.407 g of Cs2CO3. This was degassed at 120°C for 20 min under vacuum in a three-neck flask to form Cs-oleate. The Cs-oleate precursor was kept under N2 instead of vacuum after Cs2CO3 was completely dissolved in the solution. Then the PbI2 precursor was formed by mixing 0.5 g of PbI2 and 25 mL of ODE in a three-neck flask and heated at 120°C for 20 min under vacuum. A preheated mixture of OA and OAm (135°C, 2.5 mL each) was transferred into the PbI2 solution that was kept at 120°C under vacuum. After the PbI2 completely dissolved in the solution, the reaction flask was heated to the desired temperature (140, 160, or 180°C) under flowing N2. Then 2 mL of the Cs-oleate precursor was swiftly injected into the reaction flask. In general, smaller nanocrystals are obtained with lower growth and larger are obtained with higher temperature, but some sizes overlap this trend when using the size selective precipitation. Immediately after the reaction, the mixture was quenched by submerging the flask into an ice bath within 3 s after the injection. After cooling to room temperature, 70 mL of MeOAc was added into the colloidal solution and the mixed solution was centrifuged at 7500 rpm for 5 min.

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“…[52] Recently, Becker et al showed the lowest triplet exciton for CsPbX 3 is bright, which explains the anomalously fast emission rates for these materials compared to other semiconductors. [58] Raino and coworkers observed suppressed blinking and a fast decay from lowtemperature (6 K) photoluminescence measurements of CsPbCl x Br 3-x nanocrystals. [56] Both transition metals [35,57] and rare earth metals [34] have been doped into CsPbX 3 , achieving quantum yields greater than 60 % and 170 %, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Beimborn et al studied the effect of pressure-induced deformation on the photoluminescence, which leads to a fully reversible blue shift with decreasing intensity. [58] Raino and coworkers observed suppressed blinking and a fast decay from lowtemperature (6 K) photoluminescence measurements of CsPbCl x Br 3-x nanocrystals. [53] In contrast, Diroll et al studied high temperature photoluminescence of CsPbX 3 nanocrystals (up to 550 K), showing reversible photoluminescence loss below 450 K for CsPbBr 3 (the highest threshold among the compositions studied).…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals

et al. 2019

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Lead halide perovskites possess unique characteristics that are well-suited for optoelectronic and energy capture devices, however, concerns about their long-term stability remain. Limited stability is often linked to the methylammonium cation, and all-inorganic CsPbX 3 (X=Cl, Br, I) perovskite nanocrystals have been reported with improved stability. In this work, the photostability and thermal stability properties of CsPbX 3 (X=Cl, Br, I) nanocrystals were investigated by means of electron microscopy, X-ray diffraction, thermogravimetric analysis coupled with FTIR (TGA-FTIR), ensemble and single particle spectral characterization. CsPbBr 3 was found to be stable under 1-sun illumination for 16 h in ambient conditions, although single crystal luminescence analysis after illumination using a solar simulator indicates that the luminescence states are changing over time. CsPbBr 3 was also stable to heating to 250°C. Large CsPbI 3 crystals (34 � 5 nm) were shown to be the least stable composition under the same conditions as both XRD reflections and Raman bands diminish under irradiation; and with heating the γ (black) phase reverts to the nonluminescent δ phase. Smaller CsPbI 3 nanocrystals (14 � 2 nm) purified by a different washing strategy exhibited improved photostability with no evidence of crystal growth but were still thermally unstable. Both CsPbCl 3 and CsPbBr 3 show crystal growth under irradiation or heat, likely with a preferential orientation based on XRD patterns. TGA-FTIR revealed nanocrystal mass loss was only from liberation and subsequent degradation of surface ligands. Encapsulation or other protective strategies should be employed for long-term stability of these materials under conditions of high irradiance or temperature.[a] B.

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Pressure Response of Photoluminescence in Cesium Lead Iodide Perovskite Nanocrystals

Cited by 45 publications

References 47 publications

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

Size-Dependent Lattice Structure and Confinement Properties in CsPbI₃ Perovskite Nanocrystals: Negative Surface Energy for Stabilization

Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals

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Pressure Response of Photoluminescence in Cesium Lead Iodide Perovskite Nanocrystals

Cited by 45 publications

References 47 publications

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

Preserving a robust CsPbI3 perovskite phase via pressure-directed octahedral tilt

Size-Dependent Lattice Structure and Confinement Properties in CsPbI3 Perovskite Nanocrystals: Negative Surface Energy for Stabilization

Unveiling the Photo‐ and Thermal‐Stability of Cesium Lead Halide Perovskite Nanocrystals

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Size-Dependent Lattice Structure and Confinement Properties in CsPbI₃ Perovskite Nanocrystals: Negative Surface Energy for Stabilization