David P. Fenning
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View article: Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells
Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells Open
The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels of ultraviolet (UV) radiation that they would receive in actual outdoor use. We report degradation mechanisms of p-i-n-struc…
View article: CaCd$_2$P$_2$: A Visible-Light Absorbing Zintl Phosphide Stable under Photoelectrochemical Water Oxidation
CaCd$_2$P$_2$: A Visible-Light Absorbing Zintl Phosphide Stable under Photoelectrochemical Water Oxidation Open
A key bottleneck to solar fuels is the absence of stable and strongly absorbing photoelectrode materials for the oxygen evolution reaction (OER). Modern approaches generally trade off between stable but weakly absorbing materials, such as …
View article: Dissymmetry Factor Enhancement: A Data-Driven Approach to Unravel the Synthesis Knobs of Chiral 2D Perovskites
Dissymmetry Factor Enhancement: A Data-Driven Approach to Unravel the Synthesis Knobs of Chiral 2D Perovskites Open
Chiral 2D metal halide perovskites (MHPs) hold promise for next-generation spin-optoelectronic applications. While still in early-stage development, significant efforts have focused on optimizing the dissymmetry factor (g), particularly in…
View article: BaCd2P2: a promising impurity-tolerant counterpart of GaAs for photovoltaics
BaCd2P2: a promising impurity-tolerant counterpart of GaAs for photovoltaics Open
BaCd2P2 (BCP) has been recently identified as a new solar absorber with promising optoelectronic properties. This work demonstrates that, despite having a low precursor purity (98.90% to 99.95%), synthesized BCP samples exhibit promising p…
View article: Water reflection analysis of encapsulated photovoltaic modules
Water reflection analysis of encapsulated photovoltaic modules Open
A method for moisture testing of a fully assembled photovoltaic (PV) module. An assembled PV module is probed with short wave IR probe energy in the range of 1700-2000 nm. Energy reflected from the assembled PV module is collected and dire…
View article: Polytype selection in the antisolvent-free crystallization of formamidinium lead iodide using alkylammonium chlorides
Polytype selection in the antisolvent-free crystallization of formamidinium lead iodide using alkylammonium chlorides Open
This work presents a systematic study of how the size of the C 0 –C 4 alkylammonium chloride additive directs the crystallization pathway in antisolvent-free FAPbI 3 films. We find that larger cations promote the intermediate formation of …
View article: Dissymmetry Factor Enhancement: A Data-Driven Approach to Unravel the Synthesis Knobs of Chiral 2D Perovskites
Dissymmetry Factor Enhancement: A Data-Driven Approach to Unravel the Synthesis Knobs of Chiral 2D Perovskites Open
View article: Problems with solutions: manipulating alkylammonium additive reactivity for durable high-quality perovskite films
Problems with solutions: manipulating alkylammonium additive reactivity for durable high-quality perovskite films Open
Longer-chained alkylammonium chlorides can decrease perovskite solution degradation rates and increase light/heat stability of FAPbI 3 films.
View article: Bayesian optimization and prediction of the durability of triple-halide perovskite thin films under light and heat stressors
Bayesian optimization and prediction of the durability of triple-halide perovskite thin films under light and heat stressors Open
A machine learning regression model robustly predicts phase instability in wide bandgap halide perovskites by linking the spectral variation in 60-second photoluminescence tests to tests under 800 h, 1-sun, 85 °C conditions.
View article: Understanding Process–Structure Relationships during Lamination of Halide Perovskite Interfaces
Understanding Process–Structure Relationships during Lamination of Halide Perovskite Interfaces Open
Fabrication of halide perovskite (HP) solar cells typically involves the sequential deposition of multiple layers to create a device stack, which is limited by the thermal and chemical incompatibility of top contact layers with the underly…
View article: Assessing Carrier Mobility, Dopability, and Defect Tolerance in the Chalcogenide Perovskite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Ba</mml:mi><mml:mi>Zr</mml:mi><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>
Assessing Carrier Mobility, Dopability, and Defect Tolerance in the Chalcogenide Perovskite Open
The chalcogenide perovskite BaZrS3 has attracted much attention as a promising solar absorber for thin-film photovoltaics. Here we use first-principles calculations to evaluate its carrier transport and defect properties. We find that BaZr…
View article: Low‐Temperature Synthesis of Stable CaZn<sub>2</sub>P<sub>2</sub> Zintl Phosphide Thin Films as Candidate Top Absorbers
Low‐Temperature Synthesis of Stable CaZn<sub>2</sub>P<sub>2</sub> Zintl Phosphide Thin Films as Candidate Top Absorbers Open
The development of tandem photovoltaics and photoelectrochemical solar cells requires new absorber materials with bandgaps in the range of ≈1.5–2.3 eV, for use in the top cell paired with a narrower‐gap bottom cell. An outstanding challeng…
View article: Surface‐Grafted Biocompatible Polymer Conductors for Stable and Compliant Electrodes for Brain Interfaces
Surface‐Grafted Biocompatible Polymer Conductors for Stable and Compliant Electrodes for Brain Interfaces Open
Durable and conductive interfaces that enable chronic and high‐resolution recording of neural activity are essential for understanding and treating neurodegenerative disorders. These chronic implants require long‐term stability and small c…
View article: Low-Temperature Synthesis of Stable CaZn$_2$P$_2$ Zintl Phosphide Thin Films as Candidate Top Absorbers
Low-Temperature Synthesis of Stable CaZn$_2$P$_2$ Zintl Phosphide Thin Films as Candidate Top Absorbers Open
The development of tandem photovoltaics and photoelectrochemical solar cells requires new absorber materials with band gaps in the range of ~1.5-2.3 eV, for use in the top cell paired with a narrower-gap bottom cell. An outstanding challen…
View article: Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells
Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells Open
We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI 3 ) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI 3 precurs…
View article: Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells
Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells Open
The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels of ultraviolet (UV) radiation that they would receive in actual outdoor use. We report degradation mechanisms of p-i-n–struc…
View article: Assessing carrier mobility, dopability, and defect tolerance in the chalcogenide perovskite BaZrS$_3$
Assessing carrier mobility, dopability, and defect tolerance in the chalcogenide perovskite BaZrS$_3$ Open
The chalcogenide perovskite BaZrS$_3$ has attracted much attention as a promising solar absorber for thin-film photovoltaics. Here, we use first-principles calculations to evaluate its carrier transport and defect properties. We find that …
View article: Silver-free intrinsically conductive adhesives for shingled solar cells
Silver-free intrinsically conductive adhesives for shingled solar cells Open
Achieving a net-zero emissions economy by 2050 requires immediate and accelerated growth of solar photovoltaics within the next decade. However, the projected silver consumption needed for this growth is unsustainable. Here, we use poly(3,…
View article: Lamination of >21% Efficient Perovskite Solar Cells with Independent Process Control of Transport Layers and Interfaces
Lamination of >21% Efficient Perovskite Solar Cells with Independent Process Control of Transport Layers and Interfaces Open
Transport layer and interface optimization is critical for improving the performance and stability of perovskite solar cells (PSCs) but is restricted by the conventional fabrication approach of sequential layer deposition. While the bottom…
View article: Bismuth in Lead–Tin Alloy Perovskites: Effect on Material Properties and Photovoltaic Device Performance
Bismuth in Lead–Tin Alloy Perovskites: Effect on Material Properties and Photovoltaic Device Performance Open
Metal halide perovskites (MHPs) have a strong potential for optoelectronic applications, especially photovoltaics. A significant advantage offered by MHPs is their bandgap tunability via chemical substitution and alloying, with lead–tin al…
View article: Discovery of the Zintl-phosphide BaCd2P2 as a long carrier lifetime and stable solar absorber
Discovery of the Zintl-phosphide BaCd2P2 as a long carrier lifetime and stable solar absorber Open
View article: PASCAL: the perovskite automated spin coat assembly line accelerates composition screening in triple-halide perovskite alloys
PASCAL: the perovskite automated spin coat assembly line accelerates composition screening in triple-halide perovskite alloys Open
PASCAL enables systematic exploration and data-driven analysis within the halide perovskite composition space, showcasing its efficacy as an automated platform for solution-processed optoelectronic thin film research.
View article: Cl alloying improves thermal stability and increases luminescence in iodine-rich inorganic perovskites
Cl alloying improves thermal stability and increases luminescence in iodine-rich inorganic perovskites Open
Phase stability and the optoelectronic performance of the metastable CsPbI 3 host can be improved with triple-halide alloying, without excessive Br addition which widens the gap beyond that ideal for tandem-photovoltaics.
View article: Discovery of the Zintl-phosphide BaCd$_{2}$P$_{2}$ as a long carrier lifetime and stable solar absorber
Discovery of the Zintl-phosphide BaCd$_{2}$P$_{2}$ as a long carrier lifetime and stable solar absorber Open
Thin-film photovoltaics offers a path to significantly decarbonize our energy production. Unfortunately, current materials commercialized or under development as thin-film solar cell absorbers are far from optimal as they show either low p…
View article: Ammonium cations with high pKa in perovskite solar cells for improved high-temperature photostability
Ammonium cations with high pKa in perovskite solar cells for improved high-temperature photostability Open
View article: In-situ determination of moisture- and temperature-driven deflection of an encapsulated Si photovoltaic cell
In-situ determination of moisture- and temperature-driven deflection of an encapsulated Si photovoltaic cell Open
View article: Nanoscale Surface Structure of Nanometer-Thick Ferroelectric BaTiO<sub>3</sub> Films Revealed by Synchrotron X-ray Scanning Tunneling Microscopy: Implications for Catalytic Adsorption Reactions
Nanoscale Surface Structure of Nanometer-Thick Ferroelectric BaTiO<sub>3</sub> Films Revealed by Synchrotron X-ray Scanning Tunneling Microscopy: Implications for Catalytic Adsorption Reactions Open
Ferroelectric nanomaterials are of interest in catalysis, non-volatile memory, and neuromorphic computing among other applications because of their switchable structure that can alter electronic and interface properties of a single materia…
View article: Investigation of local distortion effects on X-ray absorption of ferroelectric perovskites from first principles simulations
Investigation of local distortion effects on X-ray absorption of ferroelectric perovskites from first principles simulations Open
We investigate ferroelectric local distortion in BaTiO 3 with two widely used computational approaches with different treatments of many-body excitation effects.
View article: In-situ Mapping of Deformation in Crystalline Silicon Modules: Understanding the Effects of Viscoelasticity.
In-situ Mapping of Deformation in Crystalline Silicon Modules: Understanding the Effects of Viscoelasticity. Open
View article: Surface reaction for efficient and stable inverted perovskite solar cells
Surface reaction for efficient and stable inverted perovskite solar cells Open