Effect of structural phase transitions on the exciton absorption spectrum of thin CsPbCl3 films

Yunakova, O. N.; Miloslavsky, V. K.; Kovalenko, E. N.

doi:10.1063/1.4894319

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…Moreover, to the best of our knowledge the deposition of CsPbCl 3 films through dissolution of its precursor salts is not achievable. Different strategies for the synthesis of CsPbCl 3 have been reported in literature: bulk crystals by the Bridgman method [ 12 ]; nanocrystals by high temperature solvent [ 9 ] and similar methods; thin films by evaporation [ 13 , 14 , 15 , 16 , 17 ]. It is worth mentioning that the possibility of realizing large-area compact films of nanometric thickness is relevant for the scalability of innovative devices.…”

Section: Introductionmentioning

confidence: 99%

Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics

et al. 2021

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Caesium lead halide perovskites were recently demonstrated to be a relevant class of semiconductors for photonics and optoelectronics. Unlike CsPbBr3 and CsPbI3, the realization of high-quality thin films of CsPbCl3, particularly interesting for highly efficient white LEDs when coupled to converting phosphors, is still a very demanding task. In this work we report the first successful deposition of nanocrystalline CsPbCl3 thin films (70–150 nm) by radio frequency magnetron sputtering on large-area substrates. We present a detailed investigation of the optical properties by high resolution photoluminescence (PL) spectroscopy, resolved in time and space in the range 10–300 K, providing quantitative information concerning carriers and excitons recombination dynamics. The PL is characterized by a limited inhomogeneous broadening (~15 meV at 10 K) and its origin is discussed from detailed analysis with investigations at the micro-scale. The samples, obtained without any post-growth treatment, show a homogeneous PL emission in spectrum and intensity on large sample areas (several cm2). Temperature dependent and time-resolved PL spectra elucidate the role of carrier trapping in determining the PL quenching up to room temperature. Our results open the route for the realization of large-area inorganic halide perovskite films for photonic and optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics

et al. 2021

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“…The excitonic peak firstly shows a fast redshift trend until 320 K, followed by a slower redshift trend below 320 K. This phenomenon is attributed to a phase transition from cubic phase to tetragonal phase which occurs at around 320 K during the cooling process. The excitonic peak position is well fitted by using the Varshni equation with α1= 3.382 × 10 -4 eV/K for the cubic phase and α2= 2.376 × 10 -5 eV/K for the tetragonal phase, which is in good agreement with previous reports (77).…”

Section: Temperature-dependent Optical Absorption Spectroscopy Is Consupporting

confidence: 91%

“…For example, CsPbBr3 perovskite possesses a cubic structure at a temperature above 130°C, a tetragonal structure at a temperature between 88-130 °C and an orthorhombic structure at a temperature below 88 °C (76). CsPbCl3 perovskite exhibits the cubic structure at a temperature above 30 °C while it changes into a tetragonal phase at a temperature below 30 °C(76,77).…”

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confidence: 99%

Exciton photon coupling in all-inorganic cesium lead halide perovskite microcavities

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All-inorganic cesium lead halide perovskites are emergent semiconductors as excellent light emitters. With the ease of synthesis, high quantum efficiency, large absorption coefficient and seamlessly tunable bandgap, all-inorganic cesium lead halide perovskites are regarded as ideal semiconductor system to compensate traditional semiconductors towards high performance optoelectronic applications. In this thesis, I mainly focus on investigating lightmatter interaction properties in cesium lead halide perovskites towards future optoelectronic applications. The investigation starts from the synthesis of all-inorganic cesium lead halide perovskite crystals with excellent quality. A van der Waals (vdW) epitaxy technique is introduced in synthesizing all-inorganic cesium lead halide perovskite crystals based on a one-step vapor phase synthesis method. High quality cesium lead halide perovskite nanoplatelet crystals and large films can be obtained with excellent crystallinity and strong emissions. The emission of cesium lead halide perovskites can be seamlessly tuned from 1.7 eV to 3.0 eV by composition modulations. Most of the cesium lead halide perovskites are confirmed to possess stale excitons at room temperature by the absorption spectroscopy. Large exciton binding energies of ~ 37 meV for CsPbBr3 and ~ 70 meV for CsPbCl3 are extracted from the analysis of temperaturedependent exciton absorption peak linewidth behavior. With naturally square structure and sharp edges, cesium lead halide perovskite nanoplatelet crystals serve as excellent whisper gallery mode microcavities. These cesium lead halide perovskite microcavities exhibit lasing with low threshold ranging from 2.0 μJ/cm 2 (peak power density of 2.0 × 10 7 W/cm 2) to 10.0 μJ/cm 2 (peak power density of 1.0 × 10 8 W/cm 2) and high quality factor over 3600. Multicolor lasing actions can also be realized by composition engineering in cesium lead halide perovskite crystals, ranging from blue region to red region.

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“…Although the mixing phenomena of CsPbBr 3 and CsPbCl 3 has been reported by several groups, some of which have even fabricated perovskite LED devices taking advantage of the adjustable bandgap through mixing, the influence of mixing on both particle and film morphology has not yet been well studied. Perovskite materials are known for their structural sensitivity to external conditions, where phase transitions, structural distortion, and even degradation may occur . Therefore, it is reasonable to investigate the possible effects induced by mixing of CsPbBr 3 and CsPbCl 3 perovskite materials, especially in terms of their influence on film morphology, which essentially determines the performance of LED devices.…”

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confidence: 99%

High‐Brightness Blue and White LEDs based on Inorganic Perovskite Nanocrystals and their Composites

et al. 2017

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Inorganic metal halide perovskite nanocrystals (NCs) have been employed universally in light-emitting applications during the past two years. Here, blue-emission (≈470 nm) Cs-based perovskite NCs are derived by directly mixing synthesized bromide and chloride nanocrystals with a weight ratio of 2:1. High-brightness blue perovskite light-emitting diodes (PeLEDs) are obtained by controlling the grain size of the perovskite films. Moreover, a white PeLED is demonstrated for the first time by blending orange polymer materials with the blue perovskite nanocrystals as the active layer. Exciton transfer from the blue nanocrystals to the orange polymers via Förster or Dexter energy transfer is analyzed through time resolved photoluminescence. By tuning the ratio between the perovskite nanocrystals and polymers, pure white light is achieved with the a CIE coordinate at (0.33,0.34).

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Effect of structural phase transitions on the exciton absorption spectrum of thin CsPbCl3 films

Cited by 21 publications

References 22 publications

Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics

Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics

Exciton photon coupling in all-inorganic cesium lead halide perovskite microcavities

High‐Brightness Blue and White LEDs based on Inorganic Perovskite Nanocrystals and their Composites

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