Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Abstract

Perovskite light-emitting diodes (PeLEDs) are the next promising display technologies because of their high color purity and wide color gamut, while two classical emitter forms, i.e., polycrystalline domains and quantum dots, are encountering bottlenecks. Weak carrier confinement of large polycrystalline domains leads to inadequate radiative recombination, and surface ligands on quantum dots are the main annihilation sites for injected carriers. Here, pinpointing these issues, we screened out an amphoteric agent, namely, 2-(2aminobenzoyl)benzoic acid (2-BA), to precisely control the in situ growth of FAPbI 3 (FA: formamidine) nanodomains with enhanced space confinement, preferred crystal orientation, and passivated trap states on the transport-layer substrate. The amphoteric 2-BA performs bidentate chelating functions on the formation of ultrasmall perovskite colloids (<1 nm) in the precursor, resulting in a smoother FAPbI 3 emitting layer. Based on monodispersed and homogeneous nanodomain films, a near-infrared PeLED device with a champion efficiency of >22% plus enhanced T 80 operational stability was achieved. The proposed perovskite nanodomain film tends to be a mainstream emitter toward the performance breakthrough of PeLED devices covering visible wavelengths beyond infrared.

Performance optimization of CsPbIBr2-based perovskite solar cells through device modeling

“…The research community is paying close attention to the development of PSCs due to the rapid improvement in their device efficiency, which has increased to 26.21% in a remarkably short amount of time [1][2][3][4][5][6][7]. The main classification of cutting-edge photovoltaic materials comprises organic-inorganic hybrid perovskites (OIHP).…”

“…The main classification of cutting-edge photovoltaic materials comprises organic-inorganic hybrid perovskites (OIHP). Among them, FAPbI 3 and MAPbI 3 have attracted considerable research attention due to their outstanding optoelectronic properties and potential for optoelectronic applications [4]. However, the significant instability problem observed in OIHP-solar cells can be attributed primarily to the presence of hygroscopic and volatile organic cations [8,9].…”

Cryogenic Narrowband Green Emission in Blue-Light Excited Pb-Free Double Perovskite Cs2Ag0.6Na0.4In0.8Bi0.2Cl6@KSCN via Surface Reconstruction-Induced Energy Level Modification

“…Lead (Pb) halide perovskites have attracted considerable attention for their potential optoelectronic applications . Pb halide perovskites have excellent properties such as narrow emission line width and high photoluminescence quantum yield (PLQY) and spectral tunability. − CsPbX 3 serves as an exemplary instance, demonstrating intense photoluminescence (PL) across the entire visible spectrum. The photoluminescence quantum yield (PLQY) exceeds 90%, while the emission line width, represented by the full width at half-maximum (fwhm), ranges from 12 to 42 nm. , Pb-based perovskites are indeed susceptible to the negative effects of light, moisture, oxygen, and temperature, which can compromise their photoelectric properties. , Furthermore, Pb is known to be toxic and can harm various systems in the human body, impacting overall health .…”

High-efficiency ultra-thin GaAs solar cells based on ITO/Ag/ITO transparent electrodes and photonic crystals

“…However, the limitation of poor absorption of sunlight by thin active layers becomes a critical bottleneck restricting the improvement of their performance. Researchers actively explore various mechanisms for enhancing light absorption to improve the light absorption capabilities of thin film solar cells [6][7][8]. Chen et al proposed a design using periodically patterned top and bottom dielectric nanopyramid arrays in GaAs quantum dot solar cells.…”