Andrew Johnson
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View article: Words within worlds: theorising simulation, role play and genre in university assessment
Words within worlds: theorising simulation, role play and genre in university assessment Open
This paper explores the use of innovative forms of assessment involving ‘simulation’ or role play, from both theoretical and practical perspectives. While most university assessment tasks ask students to respond as learners within their di…
View article: Investigation of (CsMA)NaBiX$_6$ (MA= methylammonium; X=Cl,Br, I) Organic-Inorganic Hybrid Double Perovskites for Optoelectronic Applications: A First Principles Study
Investigation of (CsMA)NaBiX$_6$ (MA= methylammonium; X=Cl,Br, I) Organic-Inorganic Hybrid Double Perovskites for Optoelectronic Applications: A First Principles Study Open
Organic-inorganic hybrid double perovskites have attracted increasing interest in the commercialization of lead-free and nontoxic perovskites due to their unique optoelectronic properties compared with inorganic perovskites. In this study,…
View article: Optoelectronic Study of (MA)$_2$NaBiX$_6$ (MA= methylammonium; X=Cl,Br, I) Hybrid Double Perovskites by Ab initio Simulation
Optoelectronic Study of (MA)$_2$NaBiX$_6$ (MA= methylammonium; X=Cl,Br, I) Hybrid Double Perovskites by Ab initio Simulation Open
High prospects for different optoelectronic applications have drawn much effort towards hybrid double perovskites for the commercialization of environmentally friendly Pb-free non-toxic perovskites. Herein, the optoelectronic study of (MA)…
View article: Holistic Learning Theory: More than a Philosophy
Holistic Learning Theory: More than a Philosophy Open
An educational philosophy identifies and clarifies a set of values and understandings with respect to education that are based on a set of beliefs. A theory is a way to explain a set of facts and understand phenomena. Philosophies are conc…
View article: A Comparison of Different Textured and Non-Textured Anti-Reflective Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells
A Comparison of Different Textured and Non-Textured Anti-Reflective Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells Open
Multijunction solar cells offer a route to exceed the Shockley-Queisser limit for single-junction devices. In a few short years, silicon-perovskite tandems have significantly passed the efficiency of the best silicon single-junction cells.…
View article: A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells
A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells Open
Figure data for the paper: A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells. Submitted to ACS Applied Energy Materials.
View article: A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells
A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells Open
Figure data for the paper: A Comparison of Different Textured and Non-Textured Anti-Reflective-Coatings for Planar Monolithic Silicon-Perovskite Tandem Solar Cells. Submitted to ACS Applied Energy Materials.
View article: Ultra‐thin GaAs solar cells with nanophotonic metal‐dielectric diffraction gratings fabricated with displacement Talbot lithography
Ultra‐thin GaAs solar cells with nanophotonic metal‐dielectric diffraction gratings fabricated with displacement Talbot lithography Open
Ultra‐thin photovoltaics enable lightweight flexible form factors, suitable for emerging terrestrial applications such as electric vehicle integration. These devices also exhibit intrinsic radiation tolerance and increased specific power a…
View article: Thinned GaInP/GaInAs/Ge solar cells grown with reduced cracking on Ge|Si virtual substrates
Thinned GaInP/GaInAs/Ge solar cells grown with reduced cracking on Ge|Si virtual substrates Open
Producción Científica
View article: Upgrade to the EPICS Control System at the Argonne Wakefield Accelerator Test Facility
Upgrade to the EPICS Control System at the Argonne Wakefield Accelerator Test Facility Open
The Argonne Wakefield Accelerator (AWA) Test Facility has used a completely homebrewed, MS Windows-based control system for the last 20 years. In an effort to modernize the control system and prepare for an active machine learning program,…
View article: Baseline 1300 nm dilute nitride VCSELs
Baseline 1300 nm dilute nitride VCSELs Open
Dilute nitride (DN) vertical cavity surface emitting lasers (VCSELs) emitting near 1300 nm exhibit state-of-the-art performance including bandwidths of 10 GHz and a record high error-free data transmission of 12 Gbps. Renewed interest in D…
View article: Successful treatment of ischaemic ventricular septal defect and acute right ventricular failure: a challenging case in the modern NHS
Successful treatment of ischaemic ventricular septal defect and acute right ventricular failure: a challenging case in the modern NHS Open
A 52-year-old man, previously fit and well, presented with myocardial infarction complicated by ischaemic ventricular septal defect (VSD) and acute right ventricular failure, was successfully treated with early percutaneous coronary reperf…
View article: Needs Assessment and Workflow Analysis of Baltimore County Department of Public Works Operational Procedures for Managing Flood Reports
Needs Assessment and Workflow Analysis of Baltimore County Department of Public Works Operational Procedures for Managing Flood Reports Open
The Baltimore County Department of Public Works (BCDPW) Storm Drains Engineering Department seeks a standardized operational process and technical system that can be used within Cityworks, an asset management system used to help manage the…
View article: Space III-V Multijunction Solar Cells on Ge/Si virtual substrates
Space III-V Multijunction Solar Cells on Ge/Si virtual substrates Open
Virtual substrates based on thin Ge layers on Si substrates by direct deposition have recently achieved high quality. In this work, their application as low cost, removable substrates for the growth of high efficiency, lightweight and flex…
View article: Ge virtual substrates for high efficiency III-V solar cells: applications, potential and challenges
Ge virtual substrates for high efficiency III-V solar cells: applications, potential and challenges Open
Virtual substrates based on thin Ge layers on Si by direct deposition have achieved high quality recently. Their application to high efficiency III-V solar cells is analyzed in this work. Replacing traditional Ge substrates with Ge/Si virt…
View article: Ge virtual substrates for high efficiency III-V solar cells: \napplications, potential and challenges
Ge virtual substrates for high efficiency III-V solar cells:
\napplications, potential and challenges Open
Virtual substrates based on thin Ge layers on Si by direct deposition have achieved high quality recently. Their application to high efficiency III-V solar cells is analyzed in this work. Replacing traditional Ge substrates with Ge/Si virt…
View article: Hybrid III-V/SiGe solar cells on Si substrates and porous Si substrates
Hybrid III-V/SiGe solar cells on Si substrates and porous Si substrates Open
A tandem GaAsP/SiGe solar cell has been developed employing group-IV reverse buffer layers grown on silicon substrates with a subsurface porous layer. Reverse buffer layers facilitate a reduction in the threading dislocation density with l…
View article: Design and characterization of hybrid III–V concentrator photovoltaic–thermoelectric receivers under primary and secondary optical elements
Design and characterization of hybrid III–V concentrator photovoltaic–thermoelectric receivers under primary and secondary optical elements Open
Lattice-matched monolithic triple-junction Concentrator Photovoltaic (CPV) cells (InGa(0.495)P/GaIn(0.012)As/Ge) were electrically and thermally interfaced to two Thermoelectric (TE) Peltier module designs. An electrical and thermal model …
View article: Raw Data for Azetidinium Lead Iodide for Perovskite Solar Cells
Raw Data for Azetidinium Lead Iodide for Perovskite Solar Cells Open
Here we prepare azetidinium lead iodide for the first time. Azetidinium lead iodide is a stable, bright orange material which does not appear to form a 3D or a 2D perovskite. It was successfully used as the absorber layer in solar cells. W…
View article: Degradation of subcells and tunnel junctions during growth of GaInP/Ga(In)As/GaNAsSb/Ge 4‐junction solar cells
Degradation of subcells and tunnel junctions during growth of GaInP/Ga(In)As/GaNAsSb/Ge 4‐junction solar cells Open
A GaInP/Ga(In)As/GaNAsSb/Ge 4J solar cell grown using the combined MOVPE + MBE method is presented. This structure is used as a test bench to assess the effects caused by the integration of subcells and tunnel junctions into the full 4J st…
View article: Preliminary analysis of annealing impact on 1 eV GaNAsSb solar cells
Preliminary analysis of annealing impact on 1 eV GaNAsSb solar cells Open
Impact of annealing temperature, time and process gas on 1 eV GaNAsSb solar cells is assessed. In situ and ex situ annealings are carried out in order to analyze their effect on the solar cell performance. Ex situ annealings on as grown sa…
View article: Multijunction solar cells incorporating group IV SiGeSn alloys
Multijunction solar cells incorporating group IV SiGeSn alloys Open
In order to get higher efficiencies in multijunction solar cells, a 1eV material lattice matched to germanium has been searched tenaciously for years. In this context, a hybrid III-V/IV multijunction and single junction solar cells incorpo…
View article: Single and multi-junction solar cells utilizing a 1.0 eV SiGeSn junction
Single and multi-junction solar cells utilizing a 1.0 eV SiGeSn junction Open
Multi-junction photovoltaic technologies lead the way to achieving ultra-high power conversion efficiencies for both space based and terrestrial concentrator applications. However, realizing a lattice matched quad-junction solar cell remai…
View article: Modelling of lattice matched dilute nitride 4-junction concentrator solar cells on Ge substrates
Modelling of lattice matched dilute nitride 4-junction concentrator solar cells on Ge substrates Open
Technology Computer Aided Design modeling is used to examine the performance under light concentration of a 4-J solar cell Ge-based that includes a 1-eV MBE-grown dilute nitride subcell. The 1-eV solar cell is modeled and examined by using…