Ryan W. Crisp
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View article: Transparent Electrodes Composed of Organized Titania Nanotubes and Transition Metal Sulfides for the Oxygen Evolution Reaction
Transparent Electrodes Composed of Organized Titania Nanotubes and Transition Metal Sulfides for the Oxygen Evolution Reaction Open
Transition metal sulfides have been widely investigated as electrocatalysts for both the oxygen and hydrogen evolution reactions. Here, we synthesized copper, nickel, cobalt, and iron sulfides using a facile successive ionic layer adsorpti…
View article: Solution ALD of (CH <sub>3</sub> NH <sub>3</sub> )(PbI <sub>3</sub> ) Perovskite Thin Films Yields Functional Quality and Stability Superior to Classical Processing
Solution ALD of (CH <sub>3</sub> NH <sub>3</sub> )(PbI <sub>3</sub> ) Perovskite Thin Films Yields Functional Quality and Stability Superior to Classical Processing Open
Atomic‐level control of solution‐processed hybrid halide perovskites is achieved experimentally by solution atomic layer deposition (sALD). This method transfers the surface chemical principles of gas‐phase ALD (gALD) to precursors dissolv…
View article: Barium Titanate-Coated Cobalt Ferrite Core–Shell Magnetoelectric Nanoparticles for Wireless Actuation Technologies
Barium Titanate-Coated Cobalt Ferrite Core–Shell Magnetoelectric Nanoparticles for Wireless Actuation Technologies Open
We report a deposition pathway for barium titanate (BTO) onto hydrophobically coated cobalt ferrite (CFO) nanoparticles, resulting in the formation of magnetoelectric core-shell nanoparticles. Our strategy utilizes a bimetallic Ba and Ti o…
View article: Ultrafast Dynamics of Complete Sb<sub>2</sub>S<sub>3</sub> Solar Cells Unveiled via a Bifacial Architecture
Ultrafast Dynamics of Complete Sb<sub>2</sub>S<sub>3</sub> Solar Cells Unveiled via a Bifacial Architecture Open
Charge transfer and recombination dynamics are key to understanding and optimizing photovoltaic devices. However, metallic contacts are typically used to fabricate devices, making them incompatible with transmission spectroscopic technique…
View article: Improving Photocatalytic Hydrogen Generation via Polycitric Acid‐based Carbon Nanodots
Improving Photocatalytic Hydrogen Generation via Polycitric Acid‐based Carbon Nanodots Open
Bottom‐up syntheses of carbon nanodots (CND) using solvothermal treatment of citric acid are known to afford nanometer‐sized, amorphous polycitric acid‐based materials. The addition of suitable co‐reactants in the form of in situ synthesiz…
View article: Improving Photocatalytic Hydrogen Generation via Polycitric Acid‐based Carbon Nanodots
Improving Photocatalytic Hydrogen Generation via Polycitric Acid‐based Carbon Nanodots Open
Bottom‐up syntheses of carbon nanodots (CND) using solvothermal treatment of citric acid are known to afford nanometer‐sized, amorphous polycitric acid‐based materials. The addition of suitable co‐reactants in the form of in situ synthesiz…
View article: Colloidal organometallic synthesis of solution-processable barium titanate nanoparticles for nanoelectronic applications
Colloidal organometallic synthesis of solution-processable barium titanate nanoparticles for nanoelectronic applications Open
Colloidal BaTiO 3 nanoparticles were synthesized, ligand exchanged with oxalic acid to make an ink, and their properties explored for piezoelectrics.
View article: Coupling between the photoactivity and CO2 adsorption on rapidly thermal hydrogenated vs. conventionally annealed copper oxides deposited on TiO2 nanotubes
Coupling between the photoactivity and CO2 adsorption on rapidly thermal hydrogenated vs. conventionally annealed copper oxides deposited on TiO2 nanotubes Open
Highly ordered spaced titanium dioxide nanotubes were fabricated via electrochemical anodization and modified with titania nanoparticles and copper oxides. Such materials were rapidly annealed in hydrogen atmosphere or conventionally in a …
View article: Unravelling the intricacies of solvents and sulfur sources in colloidal synthesis of metal sulfide semiconductor nanocrystals
Unravelling the intricacies of solvents and sulfur sources in colloidal synthesis of metal sulfide semiconductor nanocrystals Open
Eight sulfur precursor moieties are reviewed to discuss and develop optimal synthetic strategies for metal sulfide synthesis.
View article: Remediation of charged organic pollutants—binding motifs for highly efficient water cleaning with nanoparticles
Remediation of charged organic pollutants—binding motifs for highly efficient water cleaning with nanoparticles Open
Many charged organic molecules behave as persistent and hazardous pollutants with harmful effects on human health and ecosystems. They are widely distributed related to their charged molecular structure that provides water solubility. In o…
View article: Understanding the Visible Absorption of Electron Accepting and Donating CNDs (Small 31/2023)
Understanding the Visible Absorption of Electron Accepting and Donating CNDs (Small 31/2023) Open
Carbon Nanodots Carbon nanodots solvothermally synthesized from citric acid and formamide result in electron-rich properties upon in situ addition of NaOH, whereas otherwise electron-poor nanomaterial is obtained with reduced or oxidized c…
View article: Monolithic two-terminal tandem solar cells using Sb2S3 and solution-processed PbS quantum dots achieving an open-circuit potential beyond 1.1 V
Monolithic two-terminal tandem solar cells using Sb2S3 and solution-processed PbS quantum dots achieving an open-circuit potential beyond 1.1 V Open
Multijunction solar cells show the prospect to raise the theoretical efficiency limit of single junction solar cells by minimizing transmissive losses of large bandgap and emissive losses of lower bandgap absorber solar cells. In solar cel…
View article: Solid‐State NMR Spectroscopic Investigation of TiO<sub>2</sub> Grown on Silica Nanoparticles by Solution Atomic Layer Deposition
Solid‐State NMR Spectroscopic Investigation of TiO<sub>2</sub> Grown on Silica Nanoparticles by Solution Atomic Layer Deposition Open
Atomic layer deposition in solution (sALD) is just emerging as a technology for the preparation of thin films. Unlike ALD from the gas phase, it allows for mild reaction conditions in a solvent phase and at room temperature, thus decreasin…
View article: Understanding the Visible Absorption of Electron Accepting and Donating CNDs
Understanding the Visible Absorption of Electron Accepting and Donating CNDs Open
Carbon nanodots (CNDs) synthesized from citric acid and formyl derivatives, that is, formamide, urea, or N‐ methylformamide, stand out through their broad‐range visible‐light absorbance and extraordinary photostability. Despite their poten…
View article: Metal halide solid-state surface treatment for nanocrystal materials
Metal halide solid-state surface treatment for nanocrystal materials Open
Methods of treating nanocrystal and/or quantum dot devices are described. The methods include contacting the nanocrystals and/or quantum dots with a solution including metal ions and halogen ions, such that the solution displaces native li…
View article: Sustainable Repellent Coatings Based on Renewable Drying and Nondrying Oils
Sustainable Repellent Coatings Based on Renewable Drying and Nondrying Oils Open
Contamination of surfaces can cause loss of performance in a variety of applications. Bioinspired coatings based on the lotus or pitcher plants provide surface topographies that create superhydrophobic or slippery features with self‐cleani…
View article: Probing Excitons in Ultrathin PbS Nanoplatelets with Enhanced Near-Infrared Emission
Probing Excitons in Ultrathin PbS Nanoplatelets with Enhanced Near-Infrared Emission Open
Colloidal PbS nanoplatelets (NPLs) are highly interesting materials for near-infrared optoelectronic applications. We use ultrafast transient optical absorption spectroscopy to study the characteristics and dynamics of photoexcited exciton…
View article: Probing Strongly Confined PbS Nanoplatelets with Enhanced Near-Infrared Emission by Transient Absorption Spectroscopy
Probing Strongly Confined PbS Nanoplatelets with Enhanced Near-Infrared Emission by Transient Absorption Spectroscopy Open
Strongly thickness-confined colloidal 2D PbS nanoplatelets (NPLs) are highly interesting materials for near-infrared (NIR) optoelectronic applications. Here, we use ultrafast transient optical absorption spectroscopy to study the character…
View article: Atomic Layer Deposition of ZnO on InP Quantum Dot Films for Charge Separation, Stabilization, and Solar Cell Formation
Atomic Layer Deposition of ZnO on InP Quantum Dot Films for Charge Separation, Stabilization, and Solar Cell Formation Open
To improve the stability and carrier mobility of quantum dot (QD) optoelectronic devices, encapsulation or pore infilling processes are advantageous. Atomic layer deposition (ALD) is an ideal technique to infill and overcoat QD films, as i…
View article: Engineering the Band Alignment in QD Heterojunction Films via Ligand Exchange
Engineering the Band Alignment in QD Heterojunction Films via Ligand Exchange Open
Colloidal quantum dots (QDs) allow great flexibility in the design of optoelectronic devices, thanks to their size-dependent optical and electronic properties and the possibility to fabricate thin films with solution-based processing. In p…
View article: Controlling Superstructure–Property Relationships via Critical Casimir Assembly of Quantum Dots
Controlling Superstructure–Property Relationships via Critical Casimir Assembly of Quantum Dots Open
The assembly of colloidal quantum dots (QDs) into dense superstructures holds great promise for the development of novel optoelectronic devices. Several assembly techniques have been explored; however, achieving direct and precise control …
View article: Finding and Fixing Traps in II–VI and III–V Colloidal Quantum Dots: The Importance of Z-Type Ligand Passivation
Finding and Fixing Traps in II–VI and III–V Colloidal Quantum Dots: The Importance of Z-Type Ligand Passivation Open
Energy levels in the band gap arising from surface states can dominate the optical and electronic properties of semiconductor nanocrystal quantum dots (QDs). Recent theoretical work has predicted that such trap states in II-VI and III-V QD…
View article: Highly Photoconductive InP Quantum Dots Films and Solar Cells
Highly Photoconductive InP Quantum Dots Films and Solar Cells Open
InP and InZnP colloidal quantum dots (QDs) are promising materials for application in light-emitting devices, transistors, photovoltaics, and photocatalytic cells. In addition to possessing an appropriate bandgap, high absorption coefficie…
View article: Quantum Dot Solar Cells: Small Beginnings Have Large Impacts
Quantum Dot Solar Cells: Small Beginnings Have Large Impacts Open
From a niche field over 30 years ago, quantum dots (QDs) have developed into viable materials for many commercial optoelectronic devices. We discuss the advancements in Pb-based QD solar cells (QDSCs) from a viewpoint of the pathways an ex…
View article: Enhanced Multiple Exciton Generation in PbS|CdS Janus-like Heterostructured Nanocrystals
Enhanced Multiple Exciton Generation in PbS|CdS Janus-like Heterostructured Nanocrystals Open
Generating multiple excitons by a single high-energy photon is a promising third-generation solar energy conversion strategy. We demonstrate that multiple exciton generation (MEG) in PbSICdS Janus-like heteronanostructures is enhanced over…
View article: Asymmetric Optical Transitions Determine the Onset of Carrier Multiplication in Lead Chalcogenide Quantum Confined and Bulk Crystals
Asymmetric Optical Transitions Determine the Onset of Carrier Multiplication in Lead Chalcogenide Quantum Confined and Bulk Crystals Open
Carrier multiplication is a process in which one absorbed photon excites two or more electrons. This is of great promise to increase the efficiency of photovoltaic devices. Until now, the factors that determine the onset energy of carrier …
View article: Selective antimony reduction initiating the nucleation and growth of InSb quantum dots
Selective antimony reduction initiating the nucleation and growth of InSb quantum dots Open
Butyl lithium reduces tris(dimethylamino)antimony to stibinein situwhich then reacts with indium-oleate to selectively produce InSb quantum dots.
View article: Repairing Nanoparticle Surface Defects
Repairing Nanoparticle Surface Defects Open
Solar devices based on semiconductor nanoparticles require the use of conductive ligands; however, replacing the native, insulating ligands with conductive metal chalcogenide complexes introduces structural defects within the crystalline n…