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Composition tunable and stable spontaneous emission and lasing in Cd-alloyed perovskite microdisks
Chemical Communications. 2024. Vol. 60. No. 93. P. 13730–13733.
Tatarinov D., Sapozhnikova E., Khmelevskaia D., Ju Y., Dolgintsev D., Bodyago E., Marunchenko A., Zhukov A., Zhong H., Scheblykin I., Pushkarev A.
All-inorganic Pb–Cd mixed-cation halide perovskites have emerged as semiconductors exhibiting improved optical and optoelectronic properties. We establish a reliable correlation between photoluminescence and Cd content x in bulk CsPb1−xCdxBr3 compositions, propose pathways of photoexcited charge carrier dynamics in them, and show improved stability of lasing in whispering gallery mode microdisks.
Language:
English
Son A. G., Gushina V. A., Teplyakov E. A. et al., Physical Chemistry Chemical Physics 2026 Vol. 28 No. 33 P. 20162–20176
We report tunable structural and optical properties of Cs‑Pb‑Br nanomaterials, including the classic CsPbBr3 perovskite, and perovskite-inspired CsPb2Br5 and Cs4PbBr6 compounds. By systematically varying precursor composition, reaction conditions, and external stimuli, such as moisture and solvents, we achieve controlled formation and reversible phase transitions among these structures. Optical spectroscopy, combined with density functional theory, reveals ...
Added: July 31, 2026
Taye B. Z., Zhu J., Liu Z. et al., Materials Science and Engineering: R: Reports 2026 Vol. 171 Article 101262
Wide-bandgap (WBG) perovskites used in monolithic tandem solar cells are limited by nonradiative recombination losses and operational instability originating from defect formation during crystallization and their subsequent evolution under illumination. Here, we show that defect formation can be regulated at the precursor stage by coordination chemistry, instead of relying only on post-crystallization passivation. A fluorinated ...
Added: July 1, 2026
Do T. T., Xing J., Liu S. et al., APL Materials 2025 Vol. 13 No. 9 Article 091111
Semiconductor lead halide perovskites have attracted significant attention for various applications. Understanding the impact of material composition on optical properties is essential for optimizing device performance. Here, we performed magneto-optical spectroscopy on high-quality bulk CsPbBr3, MAPbBr3, and MAPbI3 single crystals under magnetic fields of up to 30 T. The results revealed distinctive excitonic responses to the magnetic ...
Added: January 26, 2026
Менушенков А. П., Kagan M., Успехи физических наук 2026 Т. 196 № 1 С. 28–47
Recently, using X-ray free-electron laser radiation, the érst direct experimental evidence of the existence of a real-space paired state of charge carriers was obtained in the parent compound BaBiO3 of the bismuthate family of high-temperature superconductors (HTSCs), whose perovskite-like structure is similar to that of cuprate HTSCs. This conérmed the fundamental premises of our previously ...
Added: January 16, 2026
Li Y., Sun N., Jiang X. et al., Angewandte Chemie - International Edition 2026 Vol. 65 No. 2 Article e12989
Substantial energy loss at the wide-bandgap (WBG) perovskite/fullerene interface poses a fundamental bottleneck for efficient all-perovskite tandem solar cells (APTSCs). Surface defects of WBG perovskite are a known source of non-radiative recombination and have been well-passivated, but this interface still remains with low quasi-Fermi level splitting (QFLS) with considerable voltage loss. Here, we reveal another ...
Added: November 20, 2025
Zarudnyaya A., Segal G., Morozov A. et al., Applied Physics Letters 2025 Vol. 126 No. 26 Article 262106
CsSnI3 perovskite is a thin-film semiconductor with high intrinsic conductivity for various device applications (thermoelectric, photovoltaics, etc.). Stoichiometric CsSnI3 has high-density defects and structural imperfections affecting device performance. In this work, we made an investigation on A-site cation engineering to evaluate the correlation between structural and transport parameters for effective operation in rectifying devices. Here, ...
Added: October 1, 2025
Tan J., Jiang X., Liu D. et al., The Journal of Physical Chemistry Letters 2025 Vol. 16 No. 30 P. 7659–7665
Two-dimensional (2D) Ruddlesden–Popper (RP) perovskites are considered as promising optoelectronic materials due to their intriguing broadband emission properties. However, the origin of the broadband emission in RP perovskites remains a controversial issue. Herein, we have systematically analyzed the exciton behavior and luminescence properties of 2D (PEA)2PbI4. Our calculations demonstrate that 2D (PEA)2PbI4 exhibits significant quantum confinement ...
Added: July 25, 2025
Fu S., Sun N., Hu S. et al., Energy and Environmental Sciences 2025 Vol. 18 No. 11 P. 5503–5510
Substantial VOC loss and halide segregation in wide-bandgap (WBG) perovskite sub-cells pose significant challenges for advancing all-perovskite tandem solar cells (APTSCs). Regarding this, one of the most impactful developments is the application of hole-selective self-assembled monolayers (SAMs), leading to the advancement in APTSC technology. However, SAMs with poor polar-solvent resistance would be inevitably delaminated from ...
Added: May 8, 2025
Yin R., Wu Y., Huang Z. et al., Advanced Functional Materials 2025 Vol. 35 No. 24 Article 2419184
Perovskite solar cells (PSCs) have gained significant attention for their high efficiency, low cost, and versatile application possibilities, which are expected to play a critical role in shaping the future of photovoltaics (PV) markets. However, the power conversion efficiency (PCE) and stability of large-area PSCs still cannot meet the industrialization requirements, which are mainly associated ...
Added: January 24, 2025
Wu Y., Liu D., Chu W. et al., Nanoscale 2025 Vol. 17 No. 4 P. 2224–2234
Metal halide perovskites (MHPs) have attracted strong interest for a variety of applications due to their low cost and excellent performance, attributed largely to favorable defect properties. MHPs exhibit complex dynamics of charges and ions that are coupled in unusual ways. Focusing on a combination of two common MHP defects, i.e., a grain boundary (GB) ...
Added: November 28, 2024
Qiao L., Andrey S. Vasenko, Evgueni V. Chulkov et al., The Journal of Physical Chemistry Letters 2025 Vol. 16 No. 1 P. 215–221
Hybrid lead halide perovskites are promising materials for photovoltaic applications due to their exceptional optoelectronic properties. Here, we investigate the impact of Schottky defects─specifically PbI2(VPbI2) and CH3NH3I (VMAI) vacancies─on nonradiative recombination in CH3NH3PbI3 using time-dependent density functional theory and nonadiabatic (NA) molecular dynamics. Our results reveal that Schottky defects do not alter the fundamental bandgap or ...
Added: November 22, 2024
Anikeeva V., Болдырев Н. Ю., Семенова О. И. et al., Оптика и спектроскопия 2024 Т. 132 № 8 С. 793–799
The paper presents the results of the temperature dependences study of the luminescence spectra (3.6 – 120 K) upon excitation by 405 nm light and of the non-contact measured photoconductivity spectra (3.6 – 300 K) of a CsPbBr3 single crystal. In the low-temperature photoluminescence (PL) spectrum, in addition to the self-trapped exciton line (2.318 eV at 10 K), a rich ...
Added: October 29, 2024
Wang B., Liu D., Wu Y. et al., The Journal of Physical Chemistry Letters 2024 Vol. 15 No. 41 P. 10384–10391
Nanoscale and condensed matter systems evolve on multiple length- and time-scales, and rare events such as local phase transformation, ion segregation, defect migration, interface reconstruction, and grain boundary sliding can have a profound influence on material properties. We demonstrate how outlier detection indices can be used to identify rare events in machine-learning based, high-dimensional molecular ...
Added: October 8, 2024
Natalia V. Kryzhanovskaya, Eduard I. Moiseev, Alexey M. Nadtochiy et al., IEEE Journal on Selected Topics in Quantum Electronics 2025 Vol. 31 No. 2 Article 1501312
Technological progress makes it possible to significantly reduce the size of semiconductor laser emitters to microscales and sizes commensurate with the emission wavelength. Extreme laser miniaturization can be achieved using disk or ring resonators supporting high-Q whispering gallery modes (WGM). WGMlasers are interesting not only due to small sizes (small mode volume) but also for ...
Added: September 10, 2024
Sedykh V., Rusakov V., O. Rybchenko et al., Ceramics International 2023 Vol. 49 No. 15 P. 25640–25648
The changes in the substituted La0.5Sr0.5FeO3−γ orthoferrite under vacuum annealing in the temperature range of 200–650 °C have been studied by X-ray diffraction analysis, as well as Mössbauer and Raman spectroscopy. Annealing of the as–prepared ferrite with the rhombohedral structure (R 3‾ c) resulted in its transition to the cubic one (Pm 3‾ m) at 650 °C. In the as–prepared ferrite being paramagnetic ...
Added: February 13, 2024
A. A. Karaborchev, I. S. Makhov, M. V. Maximov et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2023 Vol. 16 No. 1.3 P. 157–162
The paper reports on the implementation of two-level lasing in injection microlasers with self-organized InAs/GaAs quantum dots. Emission bands related to the radiative electron-hole recombination involving ground and several excited states of quantum dots are observed in the spontaneous electroluminescence spectra. We investigated two-level lasing via the ground and first excited states of quantum dots ...
Added: July 3, 2023
Makhov I., Ivanov K., Moiseev E. et al., Nanomaterials 2023 Vol. 13 No. 5 Article 877
One-state and two-state lasing is investigated experimentally and through numerical simulation
as a function of temperature in microdisk lasers with Stranski–Krastanow InAs/InGaAs/GaAs
quantum dots. Near room temperature, the temperature-induced increment of the ground-state
threshold current density is relatively weak and can be described by a characteristic temperature
of about 150 K. At elevated temperatures, a faster (super-exponential) increase in ...
Added: April 25, 2023
Serovaiskii A., Kutcherov V., Vinokurov V. et al., The Journal of Physical Chemistry Letters 2022 Vol. 13 No. 43 P. 10114–10119
BiScO3 compound was obtained in the form of dense ceramic with a perovskite-type structure, and its complex characterization was determined for the first time. The corresponding synthesis procedure is described in detail. It is demonstrated that the temperature region of the phase stability at atmospheric pressure lies at T < 700 °C (973 K). It is shown that ...
Added: October 24, 2022
Liu D., Wu Y., Vasenko A. et al., Nanoscale 2023 Vol. 15 No. 1 P. 285–293
Grain boundaries (GBs) in perovskite solar cells and optoelectronic devices are widely regarded as detrimental defects that accelerate charge and energy losses through nonradiative carrier trapping and recombination, but the mechanism is still under debate owing to the diversity of GB configurations and behaviors. We combine ab initio electronic structure and machine learning force field ...
Added: September 24, 2022
Melnikov A., Anikeeva V., Semenova O. I. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 17 Article 174304
We have observed short-lived optical birefringence in a CH3NH3PbBr3 single crystal induced by a powerful nearly single-cycle terahertz pulse. Apart from the instantaneous contribution that follows the profile of the squared pump electric field, the recorded anisotropy signal contains an exponential component decaying in ∼350 fs, underdamped oscillations at the frequency of ∼0.16 THz and ...
Added: June 15, 2022
Liu D., Perez C. M., Vasenko A. et al., The Journal of Physical Chemistry Letters 2022 Vol. 13 No. 16 P. 3645–3651
Lead-free double perovskites hold promise for stable and environmentally benign solar cells; however, they exhibit low efficiencies because defects act as charge recombination centers. Identifying trap-assisted loss mechanisms and developing defect passivation strategies constitute an urgent goal. Applying unsupervised machine learning to density functional theory and nonadiabatic molecular dynamics, we demonstrate that negatively charged Br ...
Added: May 5, 2022
Shi R., Fang W. -., Vasenko A. et al., Nano Research 2022 Vol. 15 No. 3 P. 2112–2122
MAPbBr3 (MA = CH3NH3+) doping with bismuth increases electric conductivity, charge carrier density and photostability, reduces toxicity, and expands light absorption. However, Bi doping shortens excited-state lifetimes due to formation of DY− charge recombination centers. Using nonadiabatic molecular dynamics and time−domain density functional theory, we demonstrate that the DY− center forms a deep, highly localized ...
Added: September 29, 2021
Gavrikov A., Ilyukhin A., Belova Ekaterina V. et al., Ceramics International 2021 Vol. 46 No. 9 P. 13014–13024
A series of structurally characterized ionic complexes, namely [Co(MeCN)6][Sm(NO3)5] (1), [Co(bpy)3][Sm(NO3)5]·xMeOH (2) and [Co(phen)3][Sm(NO3)5]·xMeCN (3) was comprehensively studied as possible simple precursors for polycrystalline SmCoO3 perovskite. Thorough study of solid-state thermolysis revealed that in the case of 1, single-phase SmCoO3 forms even under an inert atmosphere, i.e. without external Co2+ to Co3+ oxidants. On air, ...
Added: September 23, 2021
Wu Y., Chu W., A.S. Vasenko et al., The Journal of Physical Chemistry Letters 2021 Vol. 12 No. 36 P. 8699–8705
Lead-free metal halide perovskites are environmentally friendly and have favorable electro-optical properties; however, their efficiencies are significantly below the theoretical limit. Using ab initio nonadiabatic molecular dynamics, we show that common intrinsic defects accelerate nonradiative charge recombination in CsSnI3 without creating midgap traps. This is in contrast to Pb-based perovskites, in which many defects have ...
Added: September 8, 2021