Transition from Light-Induced Phase Reconstruction to Halide Segregation in CsPbBr_3–xI_x Nanocrystal Thin Films

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(9), С. 14389 - 14403

Опубликована: Фев. 20, 2025

Inorganic metal-halide perovskite materials pave the way for many applications ranging from optoelectronics to quantum information due their low cost, high photoluminescence and energy conversion efficiencies. However, light-induced bandgap instability ion migration in mixed-halide perovskites remains a significant challenge efficiency of optoelectronic devices. Thus, we combined hyperspectral fluorescence microspectroscopy computational methods understand underlying transition mechanism between phase reconstruction segregation CsPbBr3-xIx (0 < x 3) nanocrystal thin films. Our outcomes have shown that samples with = 1.0 1.5 exhibit halide migration, favoring Br enrichment locally. In this case, an interplay photo thermal activation promotes expulsion I- lattice generates Br-rich domains, forming CsPbBr3 phase. thermodynamic parameters such as diffusibility were obtained by combining kinetic linear unmixing data Fick's second law. Moreover, observed Br-I interdiffusion followed Arrhenius-like behavior over laser-induced temperature increase. On other hand, 2.0, occurred larger CsPbBrI2 size, iodine content laser intensity employed. These three effects modify transport recombination reduction charge carrier diffusion length (LD 10.2 nm) bandgap. iodide ions diffuse surface core "type-II heterostructure", promoting red shift spectrum, which is characteristic segregation. Furthermore, real-time dark recovery reported Finally, possible physical origins these phenomena are pointed out.

Язык: Английский

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Graphite-Based Localized Heating Technique for Growing Large Area Methylammonium Lead Bromide Single Crystalline Perovskite Wafers and Their Charge Transfer Characteristics

ACS Omega, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

Development of a reproducible technique to grow large area single crystalline perovskite wafers is an open research gap in the field solar cells. A graphite-based localized heating for growing methylammonium lead bromide (CH3NH3PbBr3; MAPBr) thin film (SCTF) on different buffer layers, such as glass/indium doped tin oxide (ITO), glass/ITO/poly(triaryl amine) (PTAA), and glancing angle deposition (GLAD) coated glass/ITO/TiO2 substrates reported, their charge transport properties are discussed. It observed that can confine supersaturation precursor mainly center substrate, leading restricted number nucleations within specific substrate. Here, 2-3 seed crystals obtained initially allowed larger size up 65 mm2. The X-ray diffraction (XRD) analysis indicated SCTF actual crystal not heterogeneous group small merged together with crystallinity index (CI) 92.60 ± 0.11% which was comparable bulk (97.74 0.47%). atomic force microscopy (AFM) image depicted smooth surface (R = 4.37 0.01 nm), wave-like pattern attributed substrate morphology, implying topography plays crucial role obtaining planar SCTF. XRD, UV-visible, photoluminescence (PL), Raman, FTIR spectra analyses revealed phase pure free residual impurities. injection characteristics SCTFs grown layers were investigated using PL emission (PLE) decay analyses. decrease PLE intensity PTAA TiO2 implied exciton quenching behavior, indicating photogenerated carriers into transfer (CTLs). fast component from τ1 4.77 0.18 ns glass 3.32 0.07 3.15 0.33 ascribed interfacial recombination charges accumulated at CTL/perovskite interface. These results propose be employed optoelectronic photovoltaic device applications.

Язык: Английский

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Stabilized Yolk–Shell Perovskite CsPbBr₃/Rb₄PbBr₆ Nanocrystals for Green-Emitting Light-Emitting Diodes

ACS Applied Nano Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 27, 2025

Язык: Английский

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Laser-Controlled Growth of Plasmonic Gold Nanoparticles in PMMA Films for High-Resolution Optical Applications

ACS Applied Nano Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 11, 2025

Язык: Английский

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Nanoconfined Metal Halide Perovskite Crystallization within Removable Polymer Scaffolds

Crystal Growth & Design, Год журнала: 2025, Номер unknown

Опубликована: Апрель 14, 2025

Nanoconfining crystallization to access metastable polymorphs and prescribe crystal orientations typically involves filling inert nanoporous scaffolds with target compounds, resulting in isolated nanocrystals. Such crystal-scaffold composites are unsuitable for optoelectronic devices that require interconnected crystalline pathways charge transport. Here, we reverse the order of fabricating by first electrospinning networks amorphous methylammonium lead iodide (MAPbI3) precursor nanofibers, then introducing a poly(methyl methacrylate) (PMMA) scaffold spin coating from an antisolvent MAPbI3. PMMA suppresses MAPbI3 blooming fiber surface during thermal annealing, instead promoting formation densely packed polycrystalline crystals at fiber/PMMA interface. Near-IR photodetectors comprising nanocrystals grown within coplanar electrode geometry exhibit photocurrents up 60 times larger than those fibers annealed without PMMA. These results indicate form percolated network carriers flow through PMMA-confined fibers, significantly improved photodetector performance.

Язык: Английский

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光刻技术与光刻胶材料的进展与未来趋势

Chinese Journal of Lasers, Год журнала: 2025, Номер 52(7), С. 0700001 - 0700001

Опубликована: Янв. 1, 2025

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