Moungi G. Bawendi
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View article: Impact of Processing Environment on Anti‐Solvent Free FAPbI <sub>3</sub> Films and Solar Cells
Impact of Processing Environment on Anti‐Solvent Free FAPbI <sub>3</sub> Films and Solar Cells Open
As perovskite solar cells approach commercialization, understanding the environmental sensitivities of perovskites during fabrication becomes increasingly important. In this work, the humidity‐dependence of each deposition and annealing st…
View article: A closed-loop AI framework for hypothesis-driven and interpretable materials design
A closed-loop AI framework for hypothesis-driven and interpretable materials design Open
Scientific hypothesis generation is central to materials discovery, yet current approaches often emphasize either conceptual (idea-to-data) reasoning or data-driven (data-to-idea) analysis, rarely achieving an effective integration of both…
View article: Challenges of II‐VI and III‐V Blue Quantum Dot Light‐Emitting Diodes
Challenges of II‐VI and III‐V Blue Quantum Dot Light‐Emitting Diodes Open
Quantum dot light‐emitting diodes (QD‐LEDs) are electroluminescent devices where the emissive layer consists of inorganic colloidal quantum dots. Recent breakthroughs have enabled the development of bright and efficient blue‐emitting QD‐LE…
View article: Morphological and Chemical Changes in Cd-free Colloidal QD-LEDs During Operation
Morphological and Chemical Changes in Cd-free Colloidal QD-LEDs During Operation Open
Heavy metal-free quantum-dot light-emitting devices (QD-LEDs) have demonstrated remarkable brightness, saturated color, and high efficiencies across a broad spectral range. However, in contrast to organic LEDs (OLEDs), QD-LED operational l…
View article: Oxygen vacancy formation in ZnSeTe blue quantum dot light-emitting diodes
Oxygen vacancy formation in ZnSeTe blue quantum dot light-emitting diodes Open
Recent advancements have led to the development of bright and heavy metal-free blue-emitting quantum dot light-emitting diodes (QLEDs). However, consensus understanding of their distinct photophysical and electroluminescent dynamics remain…
View article: Third-order photon correlations extract single-nanocrystal multiexciton properties in solution
Third-order photon correlations extract single-nanocrystal multiexciton properties in solution Open
Colloidal semiconductor nanocrystals are considered promising materials for high-flux optical applications, including lasing, light-emitting diodes, biological imaging, and quantum optics. In high-flux applications, multiexcitons can signi…
View article: Electric Field Inhomogeneity in Colloidal QD‐LEDs
Electric Field Inhomogeneity in Colloidal QD‐LEDs Open
It is demonstrated that the electroluminescent layer in a colloidal quantum dot light emitting diode (QD‐LED), formed by stochastic methods such as spin‐coating, incorporates morphological thickness inhomogeneities, resulting in local elec…
View article: Spontaneous formation of robust two-dimensional perovskite phases
Spontaneous formation of robust two-dimensional perovskite phases Open
The two-dimensional on three-dimensional (2D/3D) perovskite bilayer heterostructure can improve the stability and performance of perovskite solar cells. We show that the 2D/3D perovskite stack in a device evolves dynamically during its end…
View article: A 2D/3D Heterostructure Perovskite Solar Cell with a Phase‐Pure and Pristine 2D Layer
A 2D/3D Heterostructure Perovskite Solar Cell with a Phase‐Pure and Pristine 2D Layer Open
Interface engineering plays a critical role in advancing the performance of perovskite solar cells. As such, 2D/3D perovskite heterostructures are of particular interest due to their optoelectrical properties and their further potential im…
View article: On-patient medical record and mRNA therapeutics using intradermal microneedles
On-patient medical record and mRNA therapeutics using intradermal microneedles Open
Medical interventions often require timed series of doses, thus necessitating accurate medical record-keeping. In many global settings, these records are unreliable or unavailable at the point of care, leading to less effective treatments …
View article: DNA origami directed nanometer-scale integration of colloidal quantum emitters with silicon photonics
DNA origami directed nanometer-scale integration of colloidal quantum emitters with silicon photonics Open
Incorporation of colloidal quantum emitters into silicon-based photonic devices would enable major advances in quantum optics. However, deterministic placement of individual sub-10 nm colloidal particles onto micron-sized photonic structur…
View article: Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films
Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films Open
Colloidal perovskite quantum dots (PQDs) are an exciting platform for on-demand quantum, and classical optoelectronic and photonic devices. However, their potential success is limited by the extreme sensitivity and low stability arising fr…
View article: Triplet Exciton Sensitization of Silicon Mediated by Defect States in Hafnium Oxynitride
Triplet Exciton Sensitization of Silicon Mediated by Defect States in Hafnium Oxynitride Open
Singlet exciton fission has the potential to increase the efficiency of crystalline silicon solar cells beyond the conventional single junction limit. Perhaps the largest obstacle to achieving this enhancement is uncertainty about energy c…
View article: Predicting Organic-Inorganic Halide Perovskite Photovoltaic Performance\n from Optical Properties of Constituent Films through Machine Learning
Predicting Organic-Inorganic Halide Perovskite Photovoltaic Performance\n from Optical Properties of Constituent Films through Machine Learning Open
We demonstrate a machine learning (ML) approach that accurately predicts the\ncurrent-voltage behavior of 3D/2D-structured (FAMA)Pb(IBr)3/OABr hybrid\norganic-inorganic halide perovskite (HOIP) solar cells under AM1.5\nillumination. Our ne…
View article: Accelerating Quantum Emitter Characterization with Latent Neural Ordinary Differential Equations
Accelerating Quantum Emitter Characterization with Latent Neural Ordinary Differential Equations Open
Deep neural network models can be used to learn complex dynamics from data and reconstruct sparse or noisy signals, thereby accelerating and augmenting experimental measurements. Evaluating the quantum optical properties of solid-state sin…
View article: Triplet Exciton Sensitization of Silicon Mediated by Defect States in Hafnium Oxynitride
Triplet Exciton Sensitization of Silicon Mediated by Defect States in Hafnium Oxynitride Open
Singlet exciton fission has the potential to increase the efficiency of crystalline silicon solar cells beyond the conventional single junction limit. Perhaps the largest obstacle to achieving this enhancement is uncertainty about energy c…
View article: Non-toxic and rapid chemical bath deposition for SnO2 electron transporting layers in perovskite solar cells
Non-toxic and rapid chemical bath deposition for SnO2 electron transporting layers in perovskite solar cells Open
Perovskite solar cells are a promising new solar technology with efficiencies surpassing polycrystalline silicon solar cell technology. For the n-i-p perovskite solar cells, tin oxide is typically used as the electron transport layer. One …
View article: Additive‐Free Oxidized Spiro‐MeOTAD Hole Transport Layer Significantly Improves Thermal Solar Cell Stability
Additive‐Free Oxidized Spiro‐MeOTAD Hole Transport Layer Significantly Improves Thermal Solar Cell Stability Open
Perovskite solar cells are among the most promising new solar technologies, already surpassing polycrystalline silicon solar cell efficiencies. The stability of the highest efficiency devices at elevated temperature is, however, poor. Thes…
View article: On‐Patient Temporary Medical Record for Accurate, Time‐Sensitive Information at the Point of Care
On‐Patient Temporary Medical Record for Accurate, Time‐Sensitive Information at the Point of Care Open
Accurate medical recordkeeping is important for personal and public health. Conventional forms of on‐patient medical information, such as medical alert bracelets or finger‐markings, may compromise patient privacy because they are readily v…
View article: Compositions and methods for the downconversion of light
Compositions and methods for the downconversion of light Open
The present invention generally relates to composition and methods for downconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer…
View article: Ultrafast dense DNA functionalization of quantum dots and rods for scalable 2D array fabrication with nanoscale precision
Ultrafast dense DNA functionalization of quantum dots and rods for scalable 2D array fabrication with nanoscale precision Open
Scalable fabrication of two-dimensional (2D) arrays of quantum dots (QDs) and quantum rods (QRs) with nanoscale precision is required for numerous device applications. However, self-assembly–based fabrication of such arrays using DNA origa…
View article: Theory of Photoluminescence Spectral Line Shapes of Semiconductor Nanocrystals
Theory of Photoluminescence Spectral Line Shapes of Semiconductor Nanocrystals Open
Single-molecule photoluminescence (PL) spectroscopy of semiconductor nanocrystals (NCs) reveals the nature of exciton-phonon interactions in NCs. Understanding the homogeneous spectral line shapes and their temperature dependence remains a…
View article: Time-Resolved Line Shapes of Single Quantum Emitters via Machine Learned Photon Correlations
Time-Resolved Line Shapes of Single Quantum Emitters via Machine Learned Photon Correlations Open
Solid-state single-photon emitters (SPEs) are quantum light sources that combine atomlike optical properties with solid-state integration and fabrication capabilities. SPEs are hindered by spectral diffusion, where the emitter's surroundin…
View article: Synthesis of Zwitterionic CsPbBr<sub>3</sub> Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs
Synthesis of Zwitterionic CsPbBr<sub>3</sub> Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs Open
Mechanistic studies of the morphology of lead halide perovskite nanocrystals (LHP‐NCs) are hampered by a lack of generalizable suitable synthetic strategies and ligand systems. Here, the synthesis of zwitterionic CsPbBr 3 NCs is presented …
View article: Rational Design of a Chemical Bath Deposition Based Tin Oxide Electron‐Transport Layer for Perovskite Photovoltaics
Rational Design of a Chemical Bath Deposition Based Tin Oxide Electron‐Transport Layer for Perovskite Photovoltaics Open
Chemical bath deposition (CBD) is widely used to deposit tin oxide (SnO x ) as an electron‐transport layer in perovskite solar cells (PSCs). The conventional recipe uses thioglycolic acid (TGA) to facilitate attachments of SnO x particles …
View article: Quantum Shell in a Shell: Engineering Colloidal Nanocrystals for a High-Intensity Excitation Regime
Quantum Shell in a Shell: Engineering Colloidal Nanocrystals for a High-Intensity Excitation Regime Open
Many optoelectronic processes in colloidal semiconductor nanocrystals (NCs) suffer an efficiency decline under high-intensity excitation. This issue is caused by Auger recombination of multiple excitons, which converts the NC energy into e…