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Review
Nanoscience & Nanotechnology
Xiaoyu Yang et al.
Summary: The miniaturization of conventional LEDs is becoming more popular for emerging virtual and augmented reality and ultrahigh-resolution display applications. However, there are challenges in downscaling and integrating group III-V LED chips, such as efficiency droop and inhomogeneous emissions. Perovskite LEDs (PeLEDs) provide a promising alternative due to their narrowband emission and wide colour gamut. Solution-processed perovskite emitting layers can be arranged into microscale pixels using different patterning techniques, showing potential for micro-PeLED devices.
NATURE REVIEWS MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Matteo Pitaro et al.
Summary: Metal halide perovskites, particularly tin-based compounds, show promise for optoelectronic applications, with lead-based compounds being toxic and harmful to the environment. Although tin-based perovskites offer advantages such as near-optimal bandgap and good charge carrier mobilities, their efficiency is currently limited by low defect tolerance, fast crystallization, and oxidative instability. Efforts are being made to improve tin-based perovskite solar cells, focusing on strategies to enhance device performances and address existing challenges in a concerted manner.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Seong-Jun Yang et al.
Summary: By utilizing van der Waals interactions, we have successfully achieved programmed crystal assembly of graphene and monolayer hexagonal boron nitride, resulting in wafer-scale films with near-perfect interfaces and high yield. Through controlling the thickness of the hexagonal boron nitride barrier, the multilayer structure and electronic band structure of graphene, we have demonstrated tunable electronic device arrays.
Article
Multidisciplinary Sciences
Tianju Zhang et al.
Summary: This study investigates the luminescence mechanism of Sn-based perovskites and reveals that deformation potential scattering caused by charged defects dominates the interband relaxation of excitons.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Sungyeon Heo et al.
Summary: Electrochemical n-doping of halide perovskites is challenging due to limited electrochemical stability. In this study, we report the successful electrochemical n-doping of CsPbBr3 nanocrystal films within stable potential windows. The nanocrystal films show enhanced n-doping properties compared to bulk films, and the n-doped films exhibit Fermi level shifts and increased conductivity and photoluminescence intensity.
ACS ENERGY LETTERS
(2022)
Article
Optics
Daquan Zhang et al.
Summary: This study successfully fabricated large-area highly uniform arrays of crystalline perovskite quantum wires and developed planar and spherical LEDs with high quality and outstanding uniformity.
Article
Materials Science, Multidisciplinary
Kameron R. Hansen et al.
Summary: This study investigates the intrinsic differences between lead and tin metal halide perovskites (MHPs) using the spectroscopic isolation of excitons in 2D MHPs. The results show that tin MHPs have larger polaron binding energy and lower exciton binding energy compared to lead MHPs, and their excitons exhibit Frenkel-like characteristics.
ADVANCED OPTICAL MATERIALS
(2022)
Editorial Material
Chemistry, Physical
Annamaria Petrozza
ACS ENERGY LETTERS
(2022)
Article
Multidisciplinary Sciences
Joo Sung Kim et al.
Summary: This study reports the development of ultra-bright, efficient, and stable light-emitting diodes (PeLEDs) made of core/shell perovskite nanocrystals. The nanocrystals, obtained through in situ reaction of benzylphosphonic acid with polycrystalline perovskite films, demonstrate strong carrier confinement and maintain good charge-transport properties.
Article
Chemistry, Physical
Changsoon Cho et al.
Summary: The authors explain the discrepancy between low diffusion coefficients and near-unity charge collection efficiencies in halide perovskite solar cells through the discovery of strong heterogeneity in vertical charge diffusivities in a 3D perovskite film.
Article
Chemistry, Multidisciplinary
Youjin Reo et al.
Summary: This study demonstrates a high doping efficiency of halide perovskites using a simple molecular charge transfer approach. By constructing a heterojunction and depositing diverse organic/inorganic molecules on a typical phenylethyl ammonium tin iodide perovskite, the efficient charge transfer improves the Hall mobility, providing a new opportunity for employing 2D perovskites in high-efficiency optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Indy du Fosse et al.
Summary: One of the most promising properties of lead halide perovskite nanocrystals is their defect tolerance. However, studies have shown that deep trap states can still be created by dangling bonds on surface bromide ions. This research uses density functional theory calculations to show that surface bromide sites experience a destabilizing local electrostatic potential, which pushes their dangling orbitals into the bandgap. The addition of ions can electrostatically passivate these deep trap states without covalently binding to the nanocrystal surface.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Nanoscience & Nanotechnology
Tae-Hee Han et al.
Summary: Metal halide perovskites show promise as candidates for next-generation high-colour-purity displays and lighting applications, but their industrial applications are hindered by technical bottlenecks. This Review surveys the current status of MHP emitters and PeLEDs and provides a roadmap for their successful entry into the market, highlighting the goals and requirements. Future research steps for MHPs and their device applications are also outlined.
NATURE REVIEWS MATERIALS
(2022)
Article
Chemistry, Physical
Simon Kahmann et al.
Summary: This study investigates the origin of broad emission bands in phenylethylammonium-based 2D perovskite materials through experimental and computational methods. The results indicate that emission from halide vacancies is consistent with the experimentally observed features. Emission from self-trapped excitons (STEs) may only contribute to the broad emission bands in wide-band gap compounds.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Antonella Treglia et al.
Summary: This study investigates the competing radiative and non-radiative recombination processes in tin-based perovskite thin films and reveals the impact of doping and defects on the optoelectronic properties. By combining photoluminescence measurements, trapped-carrier dynamic simulations, and first-principles calculations, the researchers uncover the differences in radiative efficiency under different doping conditions.
MATERIALS HORIZONS
(2022)
Article
Nanoscience & Nanotechnology
Sung-Joo Kwon et al.
Summary: Graphene serves as an ionic diffusion barrier in PeLEDs to prevent the etching of ITO by acidic hole-injection layers, leading to increased photoluminescence lifetime and luminous current efficiency in optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Young-Hoon Kim et al.
Summary: In this study, a one-dopant alloying strategy was employed to enhance electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) by reducing defect formation and enhancing charge carrier confinement. Surface-stabilizing agents and bromide vacancy healing agents were utilized to decrease defect density and improve carrier confinement, resulting in significant enhancement in performance.
Review
Chemistry, Multidisciplinary
Xin Li et al.
Summary: Lead-based halide perovskites have excellent properties for light-emitting applications but face challenges due to the toxic element lead, highlighting the urgency in developing lead-free alternatives. Recent advances focus on the synthesis, properties, and applications of lead-free halide perovskite materials, particularly in the field of optoelectronics.
Article
Materials Science, Multidisciplinary
Michael Seitz et al.
Summary: Transient microscopy is crucial for understanding the dynamics of optical excited states in optoelectronic materials, providing a direct visualization of energy carrier movement. Long-acquisition time transient photoluminescence microscopy, combined with transient spectroscopy, reveals a distinct distribution of traps in 2D perovskites, explaining anomalous evolution of exciton distribution. These results highlight the value of transient microscopy as a complementary tool in semiconductor excited state dynamics characterization.
ADVANCED OPTICAL MATERIALS
(2021)
Review
Chemistry, Physical
Eric Amerling et al.
Summary: Research on derivatives of both bulk and low-dimensional metal halide perovskite semiconductors has grown significantly in the past decade, but the understanding and intentional applications of electronic doping have lagged behind. Successful electronic doping of these materials likely requires careful consideration and application of established doping strategies and mechanisms in the semiconductor field.
ACS ENERGY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Jun-Ho Park et al.
Summary: This study demonstrates the successful fabrication of atomically clean metal/graphene/n-type silicon junctions, which significantly increase the current density at reverse bias. The different transport data between silicon(111) and silicon(100) surfaces suggest the potential of using graphene interlayer to suppress metal-induced gap states and study intrinsic electrical properties of materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Youjin Reo et al.
Summary: This study systematically investigated the lattice structural variation, film properties, and thin-film transistor performance of phenethylammonium tin iodide perovskite by incorporating different monovalent cations. The experimental results showed that the incorporated foreign aliovalent cations were segregated along the grain boundaries instead of doped inside the perovskite lattice. The CuI-(PEA)2SnI4 heterostructure composite channel layers exhibited much improved film properties and device performance compared with the pristine ones.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Simon Kahmann et al.
Summary: 2D perovskites offer a rich field to explore exciton physics and have great potential for opto-electronic applications. This study investigates PEA(2)PbBr(4), PEA(2)PbI(4), and PEA(2)SnI(4) through optical spectroscopy, revealing complex excitonic transitions at low temperature. The study deepens insights into the photophysics of 2D perovskites through compositional substitution.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Aihui Liang et al.
Summary: A novel p-conjugated ligand design approach is demonstrated to control the nucleation and growth kinetics of two-dimensional halide perovskite thin films, resulting in highly ordered crystalline structures and large grain size. This method enables the fabrication of high-performance field-effect transistors with clear deciphering of the structure-property relationships in these emerging 2D semiconductor systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Yuan Liu et al.
Summary: This study introduces a new type of perovskite quantum dots that remain stable in a thin layer of precursor solution and utilize strained QDs as nucleation centers to drive homogeneous crystallization. These new materials show suppressed Auger bi-exciton recombination and bright luminescence under high excitation, leading to primary red LEDs with significantly enhanced performance compared to control materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Andrew H. Proppe et al.
Summary: Many top-performing perovskite photovoltaic devices utilize 2D/3D interfaces to enhance efficiency and stability. This study reveals the gradual dimensional reduction process from 3D to 2D perovskites.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Shaohua Yu et al.
Summary: The temperature-dependent bandgap in CsPbBr3 perovskites varies with material dimensionality, showing an initial blueshift followed by a redshift trend in 2D nanoplatelets. This shift is attributed to the larger contribution from electron-optical phonon interaction in nanoplatelets compared to nanocrystals, as indicated by the Bose-Einstein two-oscillator modeling. These findings provide valuable insights into the origin of temperature-dependent bandgap shifts in perovskite semiconductor materials.
Article
Chemistry, Physical
Jence T. Mulder et al.
Summary: Lead halide perovskite nanocrystals can be successfully p-doped via electrochemical hole injection, allowing for control over electronic doping of these materials.
ACS ENERGY LETTERS
(2021)
Review
Nanoscience & Nanotechnology
Yang Zhou et al.
Summary: Metal halide perovskites (MHPs) have huge potential for optoelectronic technologies, but current challenges include insufficient defect tolerance. Recent research focuses on defect activity in high-bandgap and low-bandgap MHPs to address performance and stability issues.
NATURE REVIEWS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
R. Carmina Monreal
Summary: In this study, theoretical analysis is conducted on the effects of electron-phonon interaction on the dynamics of an electron transitioning between localized and extended band states in a small quantum dot. The electron motion exhibits quasiperiodic behavior with oscillations around a mean value, depending on the coupling strength. The time-averaged trap occupancy is significantly influenced by the electron-phonon interaction, with potential resonances forming at specific coupling parameter values.
Article
Chemistry, Multidisciplinary
Zhibin Fang et al.
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Huihui Zhu et al.
ADVANCED MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Yiliu Wang et al.
NATURE NANOTECHNOLOGY
(2020)
Article
Multidisciplinary Sciences
Fanglong Yuan et al.
Article
Materials Science, Multidisciplinary
Hee Taek Yi et al.
Article
Chemistry, Physical
Partha Maity et al.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Optics
Yang Liu et al.
Article
Chemistry, Physical
Stephanie ten Brinck et al.
ACS ENERGY LETTERS
(2019)
Article
Chemistry, Physical
Felix Thouin et al.
Article
Chemistry, Physical
Maryna I. Bodnarchuk et al.
ACS ENERGY LETTERS
(2019)
Article
Nanoscience & Nanotechnology
Cong Liu et al.
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Multidisciplinary Sciences
Yuan Liu et al.
Review
Chemistry, Physical
Quinten A. Akkerman et al.
Article
Chemistry, Multidisciplinary
Rebecca L. Milot et al.
ADVANCED MATERIALS
(2018)
Article
Multidisciplinary Sciences
Kebin Lin et al.
Article
Physics, Multidisciplinary
Alexey Chernikov et al.
PHYSICAL REVIEW LETTERS
(2015)
Article
Multidisciplinary Sciences
Samuel D. Stranks et al.
Article
Physics, Multidisciplinary
V Huard et al.
PHYSICAL REVIEW LETTERS
(2000)
