Devendra Tiwari
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View article: Effect of bovine serum albumin (BSA) variants on the photophysical and biological properties of a NIR-responsive BSA–indocyanine green complex
Effect of bovine serum albumin (BSA) variants on the photophysical and biological properties of a NIR-responsive BSA–indocyanine green complex Open
Thematic representation of the BSA variant dependent changes in the photophysical properties and phototherapeutic performance of the BSA–ICG complex.
View article: Utilizing Solvent Repulsion between Dimethylformamide and Isopropanol to Manipulate Sn Distribution for Bifacial Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> Solar Cells
Utilizing Solvent Repulsion between Dimethylformamide and Isopropanol to Manipulate Sn Distribution for Bifacial Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> Solar Cells Open
Rationalizing the role of chemical interactions in the precursor solutions on the structure, morphology, and performance of thin-film Cu2ZnSn(S,Se)4 (CZTSSe) is key for the development of bifacial and other photovoltaic (PV) device archite…
View article: Correlating Molecular Precursor Interactions with Device Performance in Solution-Processed Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> Thin-Film Solar Cells
Correlating Molecular Precursor Interactions with Device Performance in Solution-Processed Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> Thin-Film Solar Cells Open
Research efforts aimed at improving the crystal quality of solution-processed Cu2ZnSn(S,Se)4 (CZTSSe) absorbers have largely employed delicate pre- and postprocessing strategies, such as multistep selenization, heat treatment in mixed chal…
View article: High‐Temperature Equilibrium of 3D and 2D Chalcogenide Perovskites
High‐Temperature Equilibrium of 3D and 2D Chalcogenide Perovskites Open
Chalcogenide perovskites have been recently proposed as novel absorber materials for photovoltaic applications. BaZrS 3 , the most investigated compound of this family, shows a high absorption coefficient, a bandgap of around 1.8 eV, and e…
View article: High temperature equilibrium of 3D and 2D chalcogenide perovskites
High temperature equilibrium of 3D and 2D chalcogenide perovskites Open
Chalcogenide perovskites have been recently under the researchers spotlight as novel absorber materials for photovoltaic applications. BaZrS$_3$, the most investigated compound of this family, shows a high absorption coefficient, a bandgap…
View article: Mapping the Energetics of Defect States in Cu<sub>2</sub>ZnSnS<sub>4</sub> films and the Impact of Sb Doping
Mapping the Energetics of Defect States in Cu<sub>2</sub>ZnSnS<sub>4</sub> films and the Impact of Sb Doping Open
The sub-bandgap levels associated with defect states in Cu2ZnSnS4 (CZTS) thin films are investigated by correlating the temperature dependence of the absorber photoluminescence (PL) with the device admittance spectroscopy. CZTS thin films …
View article: Correlating Orbital Composition and Activity of LaMn<sub><i>x</i></sub>Ni<sub>1–<i>x</i></sub>O<sub>3</sub> Nanostructures toward Oxygen Electrocatalysis
Correlating Orbital Composition and Activity of LaMn<sub><i>x</i></sub>Ni<sub>1–<i>x</i></sub>O<sub>3</sub> Nanostructures toward Oxygen Electrocatalysis Open
The atomistic rationalization of the activity of transition metal oxides toward oxygen electrocatalysis is one of the most complex challenges in the field of electrochemical energy conversion. Transition metal oxides exhibit a wide range o…
View article: The sustainable materials roadmap
The sustainable materials roadmap Open
Over the past 150 years, our ability to produce and transform engineered materials has been responsible for our current high standards of living, especially in developed economies. However, we must carefully think of the effects our addict…
View article: <i>Ex situ</i> Ge-doping of CZTS nanocrystals and CZTSSe solar absorber films
<i>Ex situ</i> Ge-doping of CZTS nanocrystals and CZTSSe solar absorber films Open
Ge doping is employed to aid the recrystallisation of Cu 2 ZnSnS 4 nanocrystals. Opto-electrical properties are presented to describe Ge incorporation with a focus on the electronic interface between the Ge:Cu 2 ZnSn(S, Se), absorber and C…
View article: Indium-free CIGS analogues: general discussion
Indium-free CIGS analogues: general discussion Open
Rafael Jaramillo opened discussion of the introductory lecture by David Mitzi: What is your most trusted approach to accurately measure the absorption coefficient on a new thin film material? David Mitzi replied: The point about significan…
View article: Bulk and surface characterisation techniques of solar absorbers: general discussion
Bulk and surface characterisation techniques of solar absorbers: general discussion Open
peer reviewed
View article: Novel chalcogenides, pnictides and defect-tolerant semiconductors: general discussion
Novel chalcogenides, pnictides and defect-tolerant semiconductors: general discussion Open
David O. Scanlon opened a discussion of the paper by Mirjana Dimitrievska: Thank you for the very nice talk Mirjana! Zn and P on their own are toxic and earth abundant, but when together as Zn3P2, they make a very potent rat poison. Are yo…
View article: Decoupling the impact of bulk and surface point defects on the photoelectrochemical properties of LaFeO<sub>3</sub> thin films
Decoupling the impact of bulk and surface point defects on the photoelectrochemical properties of LaFeO<sub>3</sub> thin films Open
This article shows, for the first time, the delicate balance between controlling bulk recombination sites and dynamics of interfacial carrier transfer via independently tuning the bulk and surface compositions of perovskite oxide thin film…
View article: Chalcogenide perovskites for photovoltaics: current status and prospects
Chalcogenide perovskites for photovoltaics: current status and prospects Open
Chalcogenide perovskite materials are anticipated to have favourable structural, optical and electronic characteristics for solar energy conversion, yet experimental verification of the numerous computational studies is still lacking. In t…
View article: Electrocatalytic Site Activity Enhancement via Orbital Overlap in A<sub>2</sub>MnRuO<sub>7</sub> (A = Dy<sup>3+</sup>, Ho<sup>3+</sup>, and Er<sup>3+</sup>) Pyrochlore Nanostructures
Electrocatalytic Site Activity Enhancement via Orbital Overlap in A<sub>2</sub>MnRuO<sub>7</sub> (A = Dy<sup>3+</sup>, Ho<sup>3+</sup>, and Er<sup>3+</sup>) Pyrochlore Nanostructures Open
Oxygen electrocatalysis at transition metal oxides is one of the key challenges underpinning electrochemical energy conversion systems, involving a delicate interplay of the bulk electronic structure and surface coordination of the active …
View article: High Interfacial Hole‐Transfer Efficiency at GaFeO<sub>3</sub> Thin Film Photoanodes
High Interfacial Hole‐Transfer Efficiency at GaFeO<sub>3</sub> Thin Film Photoanodes Open
The photoelectrochemical properties of polycrystalline GaFeO 3 (GFO) thin films are investigated for the first time. Thin films prepared by sol–gel methods exhibit phase‐pure orthorhombic GFO with the Pc 21 n space group, as confirmed by X…
View article: Promoting Active Electronic States in LaFeO<sub>3</sub> Thin-Films Photocathodes via Alkaline-Earth Metal Substitution
Promoting Active Electronic States in LaFeO<sub>3</sub> Thin-Films Photocathodes via Alkaline-Earth Metal Substitution Open
The effects of alkaline-earth metal cation (AMC; Mg2+, Ca2+, Sr2+, and Ba2+) substitution on the photoelectrochemical properties of phase-pure LaFeO3 (LFO) thin-films are elucidated by X-ray photoemission spectroscopy (XPS), X-ray diffract…
View article: CSD 1961688: Experimental Crystal Structure Determination
CSD 1961688: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Crystal and Electronic Structure of Bismuth Thiophosphate, BiPS<sub>4</sub>: An Earth-Abundant Solar Absorber
Crystal and Electronic Structure of Bismuth Thiophosphate, BiPS<sub>4</sub>: An Earth-Abundant Solar Absorber Open
The optoelectronic properties of crystalline BiPS4 have been described for the first time for solar energy conversion. Detailed structural analysis is extracted from XRD refinement of powders synthesized by the solid-state method. BiPS4 ex…
View article: Doping and alloying of kesterites
Doping and alloying of kesterites Open
Attempts to improve the efficiency of kesterite solar cells by changing the intrinsic stoichiometry have not helped to boost the device efficiency beyond the current record of 12.6%. In this light, the addition of extrinsic elements to the…
View article: Photovoltaic Performance of Phase-Pure Orthorhombic BiSI Thin-Films
Photovoltaic Performance of Phase-Pure Orthorhombic BiSI Thin-Films Open
A single-precursor solution approach is developed for depositing stoichiometric BiSI thin films featuring pure paraelectric orthorhombic (Pnam) phase. The compact and homogeneous films are composed of flake-shaped grains oriented antiplana…
View article: Nanostructured LaFeO<sub>3</sub> Photocathodes with Onset Potentials for the Hydrogen Evolution Reaction Over 1.4 V vs. RHE
Nanostructured LaFeO<sub>3</sub> Photocathodes with Onset Potentials for the Hydrogen Evolution Reaction Over 1.4 V vs. RHE Open
The photoelectrochemical properties of phase-pure LaFeO 3 (LFO) nanostructured films are investigated upon modification with a thin TiO 2 film and Pt nanoparticles as a catalyst. LaFeO 3 with crystallite domains in the range of 60 nm are p…
View article: Above 600 mV Open-Circuit Voltage BiI<sub>3</sub> Solar Cells
Above 600 mV Open-Circuit Voltage BiI<sub>3</sub> Solar Cells Open
Phase-pure BiI3 films obtained by versatile gas-phase iodination of Bi2S3 are investigated as an absorber in photovoltaic devices. This preparation method leads to highly crystalline BiI3 films featuring a rhombohedral phase and a high-deg…
View article: Investigating the Role of the Organic Cation in Formamidinium Lead Iodide Perovskite Using Ultrafast Spectroscopy
Investigating the Role of the Organic Cation in Formamidinium Lead Iodide Perovskite Using Ultrafast Spectroscopy Open
Organic cation rotation in hybrid organic-inorganic lead halide perovskites has previously been associated with low charge recombination rates and (anti)ferroelectric domain formation. Two-dimensional infrared spectroscopy (2DIR) was used …
View article: Textured PbI2 photocathodes obtained by gas phase anion replacement
Textured PbI2 photocathodes obtained by gas phase anion replacement Open
High quality PbI2 films are prepared by new route based on iodination of solution processed PbS films at room temperature. The PbI2 films are characterized by a highly texture morphology with flake-like particles sizing 500 and 800 nm acro…