Jef Poortmans
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View article: In-depth study of degradation in scalable wide bandgap perovskite cells
In-depth study of degradation in scalable wide bandgap perovskite cells Open
Perovskite solar cells with a wide bandgap (WBG) perovskite absorber of 1.68 eV are fabricated and their performance evolution under accelerated stressing conditions are compared with 1.61 eV reference devices. The cells are processed enti…
View article: Evaluating the influence of different agrivoltaic topologies on PV energy, crop yields and land productivity in a temperate climate
Evaluating the influence of different agrivoltaic topologies on PV energy, crop yields and land productivity in a temperate climate Open
Agrivoltaics (AV) is a key technology to meet some of the sustainable development goals. In AV systems, light is the main limiting resource for crop growth. Hence, standard density photovoltaic (PV) designs could be detrimental to crop yie…
View article: Fabrication of bendable and narrow bandgap Cu(In,Ga)(S,Se)2 for tandem photovoltaics
Fabrication of bendable and narrow bandgap Cu(In,Ga)(S,Se)2 for tandem photovoltaics Open
Cu(In,Ga)(S,Se)2 absorbers with a bandgap in the near-infrared region are ideal candidates for a bottom cell in multi-junction solar cell architectures. In flexible and lightweight form factors, such devices could help power many applicati…
View article: Energy yield framework to simulate thin film CIGS solar cells and analyze limitations of the technology
Energy yield framework to simulate thin film CIGS solar cells and analyze limitations of the technology Open
View article: A novel way of analyzing perovskite outdoor degradation: the S- <i>V</i> <sub>oc</sub>
A novel way of analyzing perovskite outdoor degradation: the S- <i>V</i> <sub>oc</sub> Open
Perovskite mini-modules with two ETL compositions—thick ETL1 (LiF/C 60 /BCP) and thin ETL2 (LiF/C 60 /LiF)—were measured outdoors for over three years to assess long-term performance.
View article: Pyrene‐Based Self‐Assembled Monolayer with Improved Surface Coverage and Energy Level Alignment for Perovskite Solar Cells
Pyrene‐Based Self‐Assembled Monolayer with Improved Surface Coverage and Energy Level Alignment for Perovskite Solar Cells Open
Recently, the efficiency of p‐i‐n perovskite solar cells drastically increased, a pivotal factor being the incorporation of self‐assembled monolayers (SAMs) as a hole‐transporting layer (HTL). SAMs offer many advantages over conventional H…
View article: A 2D Simulation‐Assisted Investigation of a Low Breakdown Voltage Module
A 2D Simulation‐Assisted Investigation of a Low Breakdown Voltage Module Open
Upscaling perovskites modules from laboratory to market specifications requires modules to resist heat, humidity, and partial shading. When a device is partially covered or damaged, the unbalanced photocurrent generated can create an irrev…
View article: Assessing the light scattering properties of c-Si PV module materials for agrivoltaics: Towards more homogeneous light distribution in crop canopies
Assessing the light scattering properties of c-Si PV module materials for agrivoltaics: Towards more homogeneous light distribution in crop canopies Open
Increasing the diffusivity of transmitted light at crop canopies in agrivoltaic (AV) systems remains a desired objective. This is because diffuse light increases the uniformity of light distribution and penetrates deeper into compact crop …
View article: Encapsulation strategies for mechanical impact and damp heat reliability improvement of lightweight photovoltaic modules towards vehicle-integrated applications
Encapsulation strategies for mechanical impact and damp heat reliability improvement of lightweight photovoltaic modules towards vehicle-integrated applications Open
View article: Comparative study of the interface passivation properties of LiF and Al2O3 using silicon MIS capacitor
Comparative study of the interface passivation properties of LiF and Al2O3 using silicon MIS capacitor Open
Lithium fluoride (LiF) is currently a very popular dielectric material used as a passivation or transport layer in a variety of applications, especially in high-efficiency solar cells. Despite this, its conduction properties and interface …
View article: Surface Modulation via Conjugated Bithiophene Ammonium Salt for Efficient Inverted Perovskite Solar Cells
Surface Modulation via Conjugated Bithiophene Ammonium Salt for Efficient Inverted Perovskite Solar Cells Open
The metal halide perovskite absorbers are prone to surface defects, which severely limit the power conversion efficiencies (PCEs) and the operational stability of the perovskite solar cells (PSCs). Herein, trace amounts of bithiophene prop…
View article: A review on barrier layers used in flexible stainless-steel based CIGS photovoltaic devices
A review on barrier layers used in flexible stainless-steel based CIGS photovoltaic devices Open
View article: Revealing capacitive and inductive effects in modern industrial c-Si photovoltaic cells through impedance spectroscopy
Revealing capacitive and inductive effects in modern industrial c-Si photovoltaic cells through impedance spectroscopy Open
View article: Interconnection and lamination technologies towards ubiquitous integration of photovoltaics
Interconnection and lamination technologies towards ubiquitous integration of photovoltaics Open
In this paper, we first give some historical background and trends in PV module technologies with a focus on the growing trend towards ‘PV everywhere’, mainly targeting improved aesthetics, dimensional freedom including curved surfaces, we…
View article: Minimizing the Interface-Driven Losses in Inverted Perovskite Solar Cells and Modules
Minimizing the Interface-Driven Losses in Inverted Perovskite Solar Cells and Modules Open
The inverted p-i-n perovskite solar cells hold high promise for scale-up toward commercialization. However, the interfaces between the perovskite and the charge transport layers contribute to major power conversion efficiency (PCE) loss an…
View article: Cover Image
Cover Image Open
The cover image is based on the Research Article In situ quantification of temperature and strain within photovoltaic modules through optical sensing by Philippe Nivelle et al., https://doi.org/10.1002/pip.3622.
View article: Development and Thermo-Mechanical Reliability Assessment of Fiber Reinforced Polymers in Lightweight Pv Modules Towards Vehicle-Integrated Photovoltaics
Development and Thermo-Mechanical Reliability Assessment of Fiber Reinforced Polymers in Lightweight Pv Modules Towards Vehicle-Integrated Photovoltaics Open
View article: How cool is floating PV? A state-of-the-art review of floating PV's potential gain and computational fluid dynamics modeling to find its root cause
How cool is floating PV? A state-of-the-art review of floating PV's potential gain and computational fluid dynamics modeling to find its root cause Open
The noticeable rise in electricity demand, environmental concerns, and the intense land burden has led to installing PV systems on water bodies to create floating photovoltaic (FPV). Of all market niches, FPV is the one developing the fast…
View article: Organic ammonium iodide salts as passivation for buried interface enables efficient and stable NiO<sub><i>x</i></sub> based p-i-n perovskite solar cells
Organic ammonium iodide salts as passivation for buried interface enables efficient and stable NiO<sub><i>x</i></sub> based p-i-n perovskite solar cells Open
The interfaces between a halide perovskite absorber film and its charge transporting layers have been identified as one of the key bottlenecks for achieving high performance and stability.
View article: Assessment of 3D micro-computed tomography for PV interconnection technology development
Assessment of 3D micro-computed tomography for PV interconnection technology development Open
View article: Physics-based electrical modelling of CIGS thin-film photovoltaic modules for system-level energy yield simulations
Physics-based electrical modelling of CIGS thin-film photovoltaic modules for system-level energy yield simulations Open
Copper indium gallium selenide (CIGS) is a commercialized, high-efficiency thin-film photovoltaic (PV) technology. The state-of-the-art energy yield models for this technology have a significant normalized root mean square error (nRMSE) on…
View article: Local Enhancement of Dopant Diffusion from Polycrystalline Silicon Passivating Contacts
Local Enhancement of Dopant Diffusion from Polycrystalline Silicon Passivating Contacts Open
Passivating contacts consisting of heavily doped polycrystalline silicon (poly-Si) and ultrathin interfacial silicon oxide (SiOx) films enable the fabrication of high-efficiency Si solar cells. The electrical properties a…
View article: An Integrated Bulk and Surface Modification Strategy for Gas‐Quenched Inverted Perovskite Solar Cells with Efficiencies Exceeding 22%
An Integrated Bulk and Surface Modification Strategy for Gas‐Quenched Inverted Perovskite Solar Cells with Efficiencies Exceeding 22% Open
Inverted perovskite solar cells (PSCs) prepared by the antisolvent method have achieved power conversion efficiencies (PCEs) of over 23%, but they are not ideal for device upscaling. In contrast, gas‐quenched PSCs offer great potential for…
View article: Development and testing of light-weight PV modules based on glass-fibre reinforcement
Development and testing of light-weight PV modules based on glass-fibre reinforcement Open
In this paper we report on our approach on integrating c-Si PV into lightweight structures, in particular towards vehicle integration. To this end we want to get rid of the (bulk weight of the) glass but seek a suitable replacement in term…
View article: Assessment of Large-Scale 3d Micro-Computed Tomography for Pv Interconnection Technology Development
Assessment of Large-Scale 3d Micro-Computed Tomography for Pv Interconnection Technology Development Open
View article: A Novel Strategy for the Application of an Oxide Layer to the Front Interface of Cu(In,Ga)Se<sub>2</sub> Thin Film Solar Cells: Al<sub>2</sub>O<sub>3</sub>/HfO<sub>2</sub> Multi-Stack Design With Contact Openings
A Novel Strategy for the Application of an Oxide Layer to the Front Interface of Cu(In,Ga)Se<sub>2</sub> Thin Film Solar Cells: Al<sub>2</sub>O<sub>3</sub>/HfO<sub>2</sub> Multi-Stack Design With Contact Openings Open
<p>Interface recombination is one of the factors limiting the performance of Cu(In,Ga)Se <sub>2</sub> (CIGS). Especially in the absence of band grading at the front and rear surface, interface passivation approa…
View article: Dominant Processing Factors in Two-Step Fabrication of Pure Sulfide CIGS Absorbers
Dominant Processing Factors in Two-Step Fabrication of Pure Sulfide CIGS Absorbers Open
Pure sulfide CIGS solar cells are interesting candidates for standalone solar cells or top cells in a tandem configuration. To understand the limits and improve the power conversion efficiency of these devices, a comprehensive approach aim…
View article: Detrimental Impact of Na Upon Rb Postdeposition Treatments of Cu(In,Ga)Se<sub>2</sub> Absorber Layers
Detrimental Impact of Na Upon Rb Postdeposition Treatments of Cu(In,Ga)Se<sub>2</sub> Absorber Layers Open
Passivation of the Cu(In,Ga)Se 2 (CIGS)/Mo back contact using AlO x is studied to reduce the recombination at this interface. Herein, RbF postdeposition treatment (RbF‐PDT), a well‐established method to improve absorber and front interface…
View article: Ultrathin Cu(In,Ga)Se2 Solar Cells with Ag/AlOx Passivating Back Reflector
Ultrathin Cu(In,Ga)Se2 Solar Cells with Ag/AlOx Passivating Back Reflector Open
Ultrathin Cu(In,Ga)Se2 (CIGS) absorber layers of 550 nm were grown on Ag/AlOx stacks. The addition of the stack resulted in solar cells with improved fill factor, open circuit voltage and short circuit current density. The efficiency was i…
View article: Comparative Study of Al<sub>2</sub>O<sub>3</sub> and HfO<sub>2</sub> for Surface Passivation of Cu(In,Ga)Se<sub>2</sub> Thin Films: An Innovative Al<sub>2</sub>O<sub>3</sub>/HfO<sub>2</sub> Multistack Design
Comparative Study of Al<sub>2</sub>O<sub>3</sub> and HfO<sub>2</sub> for Surface Passivation of Cu(In,Ga)Se<sub>2</sub> Thin Films: An Innovative Al<sub>2</sub>O<sub>3</sub>/HfO<sub>2</sub> Multistack Design Open
In Cu(In,Ga)Se 2 (CIGS) thin‐film solar cells, interface recombination is one of the most important limiting factors with respect to device performance. Herein, metal–insulator–semiconductor samples are used to investigate and compare the …