Cs2AgBiBr6 shows promise for solution-processable optoelectronics, such as photovoltaics, photocatalysis, and X-ray detection. However, various spectroscopic studies report rapid charge carrier mobility loss in the first picosecond after photoexcitation, limiting collection efficiencies. The origin of this is still unclear. Here, we directly compare hot excitation with over indirect fundamental bandgap, using transient absorption THz spectroscopy on same thin film sample. From spectroscopy,...

The luminescence of CuInS2 quantum dots (QDs) is slower and spectrally broader than that many other types QDs. origin this anomalous behavior still under debate. Single-QD experiments could help settle debate, but studies by different groups have yielded conflicting results. Here, we study the photophysics single core-only core/shell CuInS2/CdS Both QDs exhibit broad PL spectra with fluctuating peak position single-exponential photoluminescence decay a slow lifetime. Spectral diffusion...

Abstract Halide double perovskite semiconductors such as Cs 2 AgBiBr 6 are widely investigated a more stable, less toxic alternative to lead‐halide perovskites in light conversion applications including photovoltaics and photoredox catalysis. However, the relatively large indirect bandgap of limits efficient sunlight absorption. Here, it is shown that controlled replacement Bi 3+ with Fe via mechanochemical synthesis results remarkable tunable absorption onset between 2.1 ≈1 eV....

Mechanochemical ball mill synthesis is an emerging method for producing complex materials, including alloyed halide elpasolite semiconductors. This solvent-free offers precise control over chemical composition, enabling fine-tuning of optical and mechanical properties. However, the formation mechanism elpasolites remains unclear. In this work, we elucidate crystallization kinetics mechanochemical Cs2AgBi0.5M0.5Br6 [M = Sb3+, In3+, or Fe3+] using in situ synchrotron X-Ray diffraction...

Copper-doped II-VI and copper-based I-III-VI2 colloidal quantum dots (CQDs) have been at the forefront of interest in nanocrystals over past decade, attributable to their optically activated copper states. However, related recombination mechanisms are still unclear. The current work elaborates on processes such materials by following spin properties copper-doped CdSe/CdS (Cu@CdSe/CdS) CuInS2 CuInS2/(CdS, ZnS) core/shell CQDs using continuous-wave time-resolved detected magnetic resonance...

Suitable optoelectronic properties of lead halide perovskites make these materials interesting semiconductors for many applications. Toxic can be substituted by combining monovalent and trivalent cations, such as in Cs2AgBiBr6. However, efficiencies Cs2AgBiBr6-based photovoltaics are still modest. To elucidate the loss mechanisms, this report, we investigate charge dynamics Cs2AgBiBr6 films double-pulse excitation time-resolved microwave conductivity (DPE-TRMC). By exciting sample with two...

Cs2AgBiBr6 (CABB) has been proposed as a promising non-toxic alternative to lead halide perovskites. However, low charge carrier collection efficiencies remain an obstacle for the incorporation of this material in optoelectronic applications. In work, we study properties CABB thin films using steady state and transient absorption reflectance spectroscopy. We find that optical measurements on such are distorted consequence multiple reflections within film. Moreover, discuss pathways behind...

Halide perovskites and elpasolites are key for optoelectronic applications due to their exceptional performance adaptability. However, understanding crucial elastic properties synthesis device operation remains limited. We performed temperature- pressure-dependent synchrotron-based powder X-ray diffraction at low pressures (ambient 0.06 GPa) investigate in ambient-pressure crystal structure. found common trends bulk modulus thermal expansivity, with an increased halide ionic radius (Cl Br I)...

Cs2AgBiBr6 is an emerging double perovskite semiconductor with robust stability. However, its potential for photovoltaics limited by indirect band gap and localized electronic structure featuring a resonant exciton large binding energy. Cs2AgBi(IxBr1–x)6 nanocrystals iodide concentrations of up to 100% were recently demonstrated, but atomistic understanding how halide mixing affects the excited-state missing. Here, we use first-principles GW Bethe–Salpeter Equation calculations show that...

Exploring Temperature- and Pressure-Dependent Elastic Properties of Halide Perovskites ElpasolitesLoreta Muscarella a, Huygen J. Jöbsis b, Bettina Baumgartner P. Tim Prins D. Nicolette Maaskant Andrei V. Petukhov Dmitry Chernyshov c, Charles J McMonagle Eline M. Hutter ba Department Physics Astronomy, Faculty Sciences, Vrije Universiteit Amsterdamb Utrecht University, Inorganic Chemistry Catalysis, Debye Institute for Nanomaterials Science, Netherlandsc ESRF, The European Synchrotron, 71...

Tuning optical and mechanical properties of Cs2AgBiBr6 double perovskites by controlled alloyingEline Hutter a, Huygen Jöbsis Loreta Muscarella Kostas Fykouras b, Linn Leppert ba Utrecht University, Inorganic Chemistry Catalysis, Debye Institute for Nanomaterials Science, Netherlandsb Universiteit Twente, Drienerlolaan 5, Enschede, NetherlandsInternational Conference on Hybrid Organic PhotovoltaicsProceedings International Photovoltaics (HOPV24)València, Spain, 2024 May 12th - 15thOrganizer:...

Cs$_2$AgBiBr$_6$ shows promise for solution-processable optoelectronics, such as photovoltaics, photocatalysis and X-ray detection. However, various spectroscopic studies report rapid charge carrier mobility loss in the first picosecond after photoexcitation, limiting collection efficiencies. The origin of this is still unclear. Here, we directly compare hot excitation with over indirect fundamental bandgap, using transient absorption THz spectroscopy on same thin film sample. From...

Halide double perovskite semiconductors such as Cs2AgBiBr6 are widely investigated a more stable, less toxic alternative to lead-halide perovskites in light conversion applications including photovoltaics and photoredox catalysis. However, the relatively large indirect bandgap of limits efficient sunlight absorption. Here, we show that controlled replacement Bi3+ with Fe3+ via mechanochemical synthesis results remarkable tunable absorption onset between 2.1 ~1 eV. Our first-principles...

Halide perovskite and elpasolite semiconductors are extensively studied for optoelectronic applications due to their excellent performance together with significant chemical structural flexibility. However, there is still limited understanding of basic elastic properties how they vary composition temperature, which relevant synthesis device operation. To address this, we performed temperature- pressure-dependent synchrotron-based powder X-ray diffraction (XRD). In contrast previous XRD...

Cs2AgBiBr6 (CABB) has been proposed as a promising nontoxic alternative to lead halide perovskites. However, low charge carrier collection efficiencies remain an obstacle for the incorporation of this material in optoelectronic applications. In work, we study properties CABB thin films using steady state and transient absorption reflectance spectroscopy. We find that optical measurements on such are distorted consequence multiple reflections within film. Moreover, discuss pathways behind...