Jan Isberg
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View article: Defect investigation of undoped wide bandgap materials: Comparison between charge transient spectroscopy (QTS) and inverse Laplace QTS
Defect investigation of undoped wide bandgap materials: Comparison between charge transient spectroscopy (QTS) and inverse Laplace QTS Open
Understanding the electrically active defects and impurities in semiconductors, especially in intrinsic or unintentionally doped wide bandgap materials, still remains a challenge. Here, time-of-flight (ToF) measurement using a solid state …
View article: Graphene on Single‐Crystal Diamond for Electronic Applications: A Brief Review
Graphene on Single‐Crystal Diamond for Electronic Applications: A Brief Review Open
Graphene on diamond has emerged as a promising platform for various electronic applications. This brief review article explores the recent advancements and the potential of graphene on diamond for electronic applications with a focus on si…
View article: Enhanced Hall mobility in graphene-on-electronic-grade diamond
Enhanced Hall mobility in graphene-on-electronic-grade diamond Open
The outstanding electronic properties of graphene make this material a candidate for many applications, for instance, ultra-fast transistors. However, self-heating and especially the detrimental influence of available supporting substrates…
View article: Optical detection of valley-polarized electron diffusion in diamond
Optical detection of valley-polarized electron diffusion in diamond Open
Using the state of valley-polarization of electrons in solids is a promising new paradigm for information storage and processing. The central challenge in utilizing valley-polarization for this purpose is to develop methods for manipulatin…
View article: Determination of the acoustic phonon deformation potentials in diamond
Determination of the acoustic phonon deformation potentials in diamond Open
The interaction between acoustic phonons and electrons in diamond has been investigated by comparing state-of-the-art time-of-flight drift velocity measurements with Monte Carlo simulations. We use a multivariable anisotropic description o…
View article: Graphene FET on Diamond for High-Frequency Electronics
Graphene FET on Diamond for High-Frequency Electronics Open
Transistors operating at high frequencies are the basic building blocks of millimeter-wave communication and sensor systems. The high velocity and mobility of carriers in graphene can open way for ultra-fast group IV transistors with simil…
View article: Investigation of Photoexcitation Energy Impact on Electron Mobility in Single Crystalline CdTe
Investigation of Photoexcitation Energy Impact on Electron Mobility in Single Crystalline CdTe Open
The exceptional electronic properties of cadmium telluride (CdTe) allow the material to be used in a wide range of high energy radiation detection applications. Understanding the mechanisms of local carrier scattering is of fundamental imp…
View article: A Valleytronic Diamond Transistor: Electrostatic Control of Valley Currents and Charge-State Manipulation of NV Centers
A Valleytronic Diamond Transistor: Electrostatic Control of Valley Currents and Charge-State Manipulation of NV Centers Open
The valley degree of freedom in many-valley semiconductors provides a new paradigm for storing and processing information in valleytronic and quantum-computing applications. Achieving practical devices requires all-electric control of long…
View article: Low-temperature mobility-lifetime product in synthetic diamond
Low-temperature mobility-lifetime product in synthetic diamond Open
The mobility-lifetime (μτ) product is an important parameter that determines the performance of electronic and photonic devices. To overcome the previously reported difficulties in measuring the μτ product at cryogenic temperatures, we imp…
View article: Diffusion-related lifetime and quantum efficiency of excitons in diamond
Diffusion-related lifetime and quantum efficiency of excitons in diamond Open
We investigate the lifetime of indirect excitons in extremely high purity\ndiamond grown by the chemical vapor deposition method. A clear correlation is\nfound between the lifetime and small strain (magnitude $< $10$^{-4}$) assessed\nusing…
View article: Carrier Scattering Mechanisms: Identification via the Scaling Properties of the Boltzmann Transport Equation
Carrier Scattering Mechanisms: Identification via the Scaling Properties of the Boltzmann Transport Equation Open
A method based on the scaling properties of the Boltzmann transport equation is proposed to identify the dominant scattering mechanisms that affect charge transport in a semiconductor. This method uses drift velocity data of mobile charges…
View article: Improving electric power generation of a standalone wave energy converter via optimal electric load control
Improving electric power generation of a standalone wave energy converter via optimal electric load control Open
This paper aims to investigate electric dynamics and improve electric power generation of an isolated wave energy converter that uses a linear permanent magnet generator as the power take-off system, excited by regular or irregular waves. …
View article: Comparison of Wave Energy Park Layouts by Experimental and Numerical Methods
Comparison of Wave Energy Park Layouts by Experimental and Numerical Methods Open
An experimental campaign of arrays with direct-driven wave energy converters of point-absorbing type is presented. The arrays consist of six identical floats, moving in six degrees of freedom, and six rotating power take-off systems, based…
View article: Advances and Challenges in Wave Energy Park Optimization—A Review
Advances and Challenges in Wave Energy Park Optimization—A Review Open
A commercial wave energy system will typically consist of many interacting wave energy converters installed in a park. The performance of the park depends on many parameters such as array layout and number of devices, and may be evaluated …
View article: On the calibration of a WEC-Sim model for heaving point absorbers
On the calibration of a WEC-Sim model for heaving point absorbers Open
The outcomes of reliability based design\nmethods applied to wave energy converters (WECs) in the\nearly stages of development depend heavily on the\nuncertainty in the variables used to determine the loads\nacting on, and responses of, de…
View article: A Model Free Control Based on Machine Learning for Energy Converters in an Array
A Model Free Control Based on Machine Learning for Energy Converters in an Array Open
This paper introduces a machine learning based control strategy for energy converter arrays designed to work under realistic conditions where the optimal control parameter can not be obtained analytically. The control strategy neither reli…
View article: Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays
Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays Open
A challenge while applying latching control on a wave energy converter (WEC) is to find a reliable and robust control strategy working in irregular waves and handling the non-ideal behavior of real WECs. In this paper, a robust and model-f…
View article: A model free control based on machine learning forenergy converters in an array
A model free control based on machine learning forenergy converters in an array Open
This paper introduces a model-free, "on-the-fly" learning control strategy for arrays of energy converters with adjustable generator damping. The devices are arranged so that they are affected simultaneously by the energy medium.…
View article: Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off
Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off Open
An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-eff…
View article: Arrays of Point-Absorbing Wave Energy Converters in Short-Crested Irregular Waves
Arrays of Point-Absorbing Wave Energy Converters in Short-Crested Irregular Waves Open
For most wave energy technology concepts, large-scale electricity production and cost-efficiency require that the devices are installed together in parks. The hydrodynamical interactions between the devices will affect the total performanc…
View article: Review of control strategies for wave energy conversion systems and their validation: the wave-to-wire approach
Review of control strategies for wave energy conversion systems and their validation: the wave-to-wire approach Open
Ocean waves are a promising source of renewable energy. In this paper, we briefly introduce the characteristics of ocean wave energy and summarize the principles of harvesting ocean energy by wave energy converters. We also review the prot…
View article: Performance of arrays of direct-driven wave energy converters under optimal power take-off damping
Performance of arrays of direct-driven wave energy converters under optimal power take-off damping Open
It is well known that the total power converted by a wave energy farm is influenced by the hydrodynamic interactions between wave energy converters, especially when they are close to each other. Therefore, to improve the performance of a w…
View article: Coordinated Control of Wave Energy Converters Subject to Motion Constraints
Coordinated Control of Wave Energy Converters Subject to Motion Constraints Open
In this paper, a generic coordinated control method for wave energy converters is proposed, and the constraints on motion amplitudes and the hydrodynamic interaction between converters are considered. The objective of the control problem i…
View article: Publisher's Note: “Investigation of transferred-electron oscillations in diamond” [Appl. Phys. Lett. <b>108</b>, 212104 (2016)]
Publisher's Note: “Investigation of transferred-electron oscillations in diamond” [Appl. Phys. Lett. <b>108</b>, 212104 (2016)] Open
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View article: Statistical Analysis of Wave Climate Data Using Mixed Distributions and Extreme Wave Prediction
Statistical Analysis of Wave Climate Data Using Mixed Distributions and Extreme Wave Prediction Open
The investigation of various aspects of the wave climate at a wave energy test site is essential for the development of reliable and efficient wave energy conversion technology. This paper presents studies of the wave climate based on nine…