Johannes de Boor
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View article: Uncertainty analysis of microscopic parameters obtained from the single parabolic band modeling of thermoelectric materials
Uncertainty analysis of microscopic parameters obtained from the single parabolic band modeling of thermoelectric materials Open
The single parabolic band (SPB) model is a popular, easy-to-use, and somewhat powerful tool to describe thermoelectric transport and is often employed for material optimization and the extraction of band structure parameters. While the fun…
View article: Asymmetric electronic band alignment and potentially enhanced thermoelectric properties in phase-separated Mg2X (X = Si,Ge,Sn) alloys
Asymmetric electronic band alignment and potentially enhanced thermoelectric properties in phase-separated Mg2X (X = Si,Ge,Sn) alloys Open
The Mg2X (X = Si, Ge, Sn) based alloy is an eco-friendly thermoelectric material for mid-temperature applications. The Mg2Si1−xSnx and Mg2Ge1−xSnx alloys can be phase-separated into Si(Ge)- and Sn-rich phases during material synthesis, lea…
View article: SeeBand: a highly efficient, interactive tool for analyzing electronic transport data
SeeBand: a highly efficient, interactive tool for analyzing electronic transport data Open
SeeBand is an interactive tool for extracting microscopic material parameters by fitting temperature-dependent thermoelectric transport properties using Boltzmann transport theory. With real-time comparison between electronic band structur…
View article: MgCuSb as a suitable electrode for contacting pre-compacted pellets of MgAgSb thermoelectric material
MgCuSb as a suitable electrode for contacting pre-compacted pellets of MgAgSb thermoelectric material Open
The p-type thermoelectric (TE) material α-MgAgSb is a promising tellurium-free bismuth telluride substitute for cooling and waste heat harvesting applications between room temperature and 573 K. Optimization of the material resulted in hig…
View article: On the Origin of Temperature Induced Performance Degradation of Cu-Contacted Mg<sub>2</sub><i>X</i>-Based (<i>X</i> = Si, Sn) Thermoelectric Materials
On the Origin of Temperature Induced Performance Degradation of Cu-Contacted Mg<sub>2</sub><i>X</i>-Based (<i>X</i> = Si, Sn) Thermoelectric Materials Open
Mg2X (X = Si, Sn)-based solid solutions are promising candidates for mid-to-high temperature waste heat recovery, but developing long-term stable thermoelectric generators (TEG) remains challenging. While Mg2<…
View article: Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks
Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks Open
View article: Instability Mechanism in Thermoelectric Mg<sub>2</sub>(Si,Sn) and the Role of Mg Diffusion at Room Temperature
Instability Mechanism in Thermoelectric Mg<sub>2</sub>(Si,Sn) and the Role of Mg Diffusion at Room Temperature Open
View article: Topological-insulating grain boundary networks for high-performance Fe2VAl thermoelectrics
Topological-insulating grain boundary networks for high-performance Fe2VAl thermoelectrics Open
Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven heat transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, in…
View article: Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics
Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics Open
Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven heat transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, in…
View article: SeeBand: A highly efficient, interactive tool for analyzing electronic transport data
SeeBand: A highly efficient, interactive tool for analyzing electronic transport data Open
Linking the fundamental physics of band structure and scattering theory with macroscopic features such as measurable bulk thermoelectric transport properties is indispensable to a thorough understanding of transport phenomena and ensures m…
View article: Surface Degradation of Mg<sub>2</sub>X-Based Composites at Room Temperature: Assessing Grain Boundary and Bulk Diffusion Using Atomic Force Microscopy and Scanning Electron Microscopy
Surface Degradation of Mg<sub>2</sub>X-Based Composites at Room Temperature: Assessing Grain Boundary and Bulk Diffusion Using Atomic Force Microscopy and Scanning Electron Microscopy Open
Practical application of thermoelectric generators necessitates materials that combine high heat-to-electricity conversion efficiency with long-term functional stability under operation conditions. While Mg2(Si,Sn)-based materia…
View article: Device level assessment of Ni and Ni45Cu55 as electrodes in Mg2(Si,Sn)-based thermoelectric generators
Device level assessment of Ni and Ni45Cu55 as electrodes in Mg2(Si,Sn)-based thermoelectric generators Open
Owing to efficient thermoelectric conversion, non-toxicity, low density and cost, Mg2(Si,Sn)-based solid solutions hold potential for mid-to-high temperature waste heat recovery. Yet, challenges arise from n-Mg2(Si,Sn) degradation at ≥400 …
View article: Instability Mechanism in Thermoelectric Mg<sub>2</sub>(Si,Sn) and the Role of Mg Diffusion at Room Temperature
Instability Mechanism in Thermoelectric Mg<sub>2</sub>(Si,Sn) and the Role of Mg Diffusion at Room Temperature Open
Mg 2 (Si,Sn) shows great promise as thermoelectric material as it is made from non‐toxic, abundant, and cost‐effective elements offering high performance. This has been emphasized by several thermoelectric generator prototypes, demonstrati…
View article: Towards energy filtering in Mg2X-based composites: Investigating local carrier concentration and band alignment via SEM/EDX and transient Seebeck microprobe analysis
Towards energy filtering in Mg2X-based composites: Investigating local carrier concentration and band alignment via SEM/EDX and transient Seebeck microprobe analysis Open
A comprehensive understanding of multi-phase materials requires the characterization of transport properties at the micro/nano-scale. Optimized alignments of the conduction bands and valence bands at the interfaces of multi-phase materials…
View article: High‐Performance Thermoelectric Devices Made Faster: Interface Design from First Principles Calculations
High‐Performance Thermoelectric Devices Made Faster: Interface Design from First Principles Calculations Open
The enormous progress achieved with high‐performance thermoelectric materials has yet to be implemented in high‐performance devices. The bottleneck for this is the material‐specific design of the interface between the thermoelectric materi…
View article: Analyzing the Performance of Thermoelectric Generators with Inhomogeneous Legs: Coupled Material–Device Modelling for Mg2X-Based TEG Prototypes
Analyzing the Performance of Thermoelectric Generators with Inhomogeneous Legs: Coupled Material–Device Modelling for Mg2X-Based TEG Prototypes Open
Thermoelectric generators (TEGs) possess the ability to generate electrical power from heat. As TEGs are operated under a thermal gradient, inhomogeneous material properties—either by design or due to inhomogeneous material degradation und…
View article: Device Level Assessment of Ni and Ni45cu55 as Electrodes in Mg2(Si,Sn)-Based Thermoelectric Generators
Device Level Assessment of Ni and Ni45cu55 as Electrodes in Mg2(Si,Sn)-Based Thermoelectric Generators Open
View article: Towards Energy Filtering in Mg2x-Based Composites: Investigating Local Carrier Concentration and Band Alignment Via Sem/Edx and Transient Seebeck Microprobe Analysis
Towards Energy Filtering in Mg2x-Based Composites: Investigating Local Carrier Concentration and Band Alignment Via Sem/Edx and Transient Seebeck Microprobe Analysis Open
View article: Grading studies for efficient thermoelectric devices using combined 1D material and device modeling
Grading studies for efficient thermoelectric devices using combined 1D material and device modeling Open
The efficiency at which thermoelectric generators (TEGs) can convert heat into electrical energy is governed by the properties of the employed functional materials. For a given thermoelectric (TE) material, efficiency needs to be maximized…
View article: Developing a two-parabolic band model for thermoelectric transport modelling using Mg <sub>2</sub> Sn as an example
Developing a two-parabolic band model for thermoelectric transport modelling using Mg <sub>2</sub> Sn as an example Open
Thermoelectrics is a field driven by material research aimed at increasing the thermal to electrical conversion efficiency of thermoelectric (TE) materials. Material optimisation is necessary to achieve a high figure of merit ( zT ) and in…
View article: Efficiency Measurement and Modeling of a High‐Performance Mg<sub>2</sub>(Si,Sn)‐Based Thermoelectric Generator
Efficiency Measurement and Modeling of a High‐Performance Mg<sub>2</sub>(Si,Sn)‐Based Thermoelectric Generator Open
Mg 2 (Si,Sn) is an attractive material class due to its excellent thermoelectric (TE) properties, its eco‐friendly constituents, its low mass density, and its low price. A lot of research has been done on optimizing its TE properties; howe…
View article: Understanding the dopability of p-type Mg<sub>2</sub>(Si,Sn) by relating hybrid-density functional calculation results to experimental data
Understanding the dopability of p-type Mg<sub>2</sub>(Si,Sn) by relating hybrid-density functional calculation results to experimental data Open
It is crucial to reach a sufficiently high carrier concentration in order to optimize the thermoelectric (TE) material in the development of Mg 2 X ( X = Si, Ge, and Sn)-based TE generators. While n-type Mg 2 (Si,Sn) has excellent TE prope…
View article: Impact of the Dopant Species on the Thermomechanical Material Properties of Thermoelectric Mg2Si0.3Sn0.7
Impact of the Dopant Species on the Thermomechanical Material Properties of Thermoelectric Mg2Si0.3Sn0.7 Open
Thermoelectric generators are an excellent option for waste heat reuse. Materials for such devices have seen their thermoelectric properties improving constantly. The functioning of a generator, however, does not only depend on thermoelect…
View article: Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb
Establishing synthesis–composition–property relationships for enhanced and reproducible thermoelectric properties of MgAgSb Open
Established synthesis–composition–property relationship proving a narrow homogeneity range while revealing that MgAgSb functional properties are governed by secondary phases.
View article: Effect of joining temperature on the interconnection zone and electrical resistance of Ag/n-Mg<sub>2</sub>Si and Ag/n-Mg<sub>2</sub>Sn contacts
Effect of joining temperature on the interconnection zone and electrical resistance of Ag/n-Mg<sub>2</sub>Si and Ag/n-Mg<sub>2</sub>Sn contacts Open
1. Study of the Ag contacted n-type Mg 2 X ( X = Si, Sn) TE materials. 2. Successful correlation of the observed phases at the n-Mg 2 X /Ag interconnection zones with the thermodynamically favorable phases. 3. Calculation of the electrical…
View article: Overcoming Asymmetric Contact Resistances in Al-Contacted Mg2(Si,Sn) Thermoelectric Legs
Overcoming Asymmetric Contact Resistances in Al-Contacted Mg2(Si,Sn) Thermoelectric Legs Open
Thermoelectric generators are a reliable and environmentally friendly source of electrical energy. A crucial step for their development is the maximization of their efficiency. The efficiency of a TEG is inversely related to its electrical…
View article: Efficiency as a performance metric for material optimization in thermoelectric generators
Efficiency as a performance metric for material optimization in thermoelectric generators Open
The optimization of thermoelectric (TE) materials with respect to carrier concentration, chemical composition, microstructure, etc. is inevitable for maximizing the performance of thermoelectric devices. Theoretical performance prediction …
View article: Fabrication of a Silicide Thermoelectric Module Employing Fractional Factorial Design Principles
Fabrication of a Silicide Thermoelectric Module Employing Fractional Factorial Design Principles Open
Thermoelectric modules can be used in waste heat harvesting, sensing, and cooling applications. Here, we report on the fabrication and performance of a four-leg module based on abundant silicide materials. While previously optimized Mg 2 S…
View article: Applications of thermodynamic calculations to practical TEG design: Mg<sub>2</sub>(Si<sub>0.3</sub>Sn<sub>0.7</sub>)/Cu interconnections
Applications of thermodynamic calculations to practical TEG design: Mg<sub>2</sub>(Si<sub>0.3</sub>Sn<sub>0.7</sub>)/Cu interconnections Open
Mg 2 (Si 0.3 Sn 0.7 )/Cu contact couple was selected to illustrate that equilibrium thermodynamic considerations are an efficient support to anticipate/identify reaction products in the bonded region, and ultimately, for improving the cont…
View article: Discrepancy between Constant Properties Model and Temperature-Dependent Material Properties for Performance Estimation of Thermoelectric Generators
Discrepancy between Constant Properties Model and Temperature-Dependent Material Properties for Performance Estimation of Thermoelectric Generators Open
The efficiency of a thermoelectric (TE) generator for the conversion of thermal energy into electrical energy can be easily but roughly estimated using a constant properties model (CPM) developed by Ioffe. However, material properties are,…