Eva Unger
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View article: Insight‐Guided Optimization of the Individual Steps in Ambient Slot‐Die‐Coated Perovskite Solar Cells
Insight‐Guided Optimization of the Individual Steps in Ambient Slot‐Die‐Coated Perovskite Solar Cells Open
Scalable fabrication of perovskite solar cells (PSCs) under ambient conditions remains a key challenge for transferring technology from the lab to industry. Herein, an insight‐guided optimization framework is presented that integrates ink …
View article: How crystallization additives govern halide perovskite grain growth
How crystallization additives govern halide perovskite grain growth Open
The preparation of perovskite solar cells from the liquid phase is a cornerstone of their immense potential. However, a clear relationship between the precursor ink and the formation of the resulting perovskite is missing. Established theo…
View article: Tackling the reproducibility gap in perovskite research: a vision for FAIR data and standardised protocols
Tackling the reproducibility gap in perovskite research: a vision for FAIR data and standardised protocols Open
A plan for going from unstructured knowledge to structured and FAIR data with the vision of simplifying insight extraction and automated reproducibility.
View article: Process Parameter Specification and Control in Solution Processing of Hybrid Perovskite Photovoltaics: From Domain‐Specific Jargon to Evidence‐Based, Unambiguous Description of Experimental Workflows
Process Parameter Specification and Control in Solution Processing of Hybrid Perovskite Photovoltaics: From Domain‐Specific Jargon to Evidence‐Based, Unambiguous Description of Experimental Workflows Open
Within the last 20 years, hybrid perovskite solar cells (PSCs) have reached remarkable power conversion efficiencies. Further, scalability of hybrid perovskite deposition routines and stability of PSCs have been significantly improved. Yet…
View article: Towards an interoperable perovskite description or how to keep track of 300 perovskite ions
Towards an interoperable perovskite description or how to keep track of 300 perovskite ions Open
Hybrid perovskites are interesting optoelectronic materials. The perovskite ABX 3 structure offers a vast compositional space, and we have identified over 300 perovskite ions. This flexibility enables tuneable properties and has significan…
View article: Photodegradation of 2D Ruddlesden‐Popper Perovskites: Consequences and Design Principles for Photoelectrochemical Applications
Photodegradation of 2D Ruddlesden‐Popper Perovskites: Consequences and Design Principles for Photoelectrochemical Applications Open
Halide perovskites (HaP), with their exceptional optoelectronic properties and high‐power conversion efficiencies in photovoltaic devices, hold promise for photoelectrochemical (PEC) applications in green fuel and chemical production. Howe…
View article: Seasonality in Perovskite Solar Cells: Insights from 4 Years of Outdoor Data
Seasonality in Perovskite Solar Cells: Insights from 4 Years of Outdoor Data Open
Insights are reported from a 4‐year outdoor study in Berlin using encapsulated p–i–n perovskite solar cells with the structure ITO | 2PACz | Cs 0.15 FA 0.85 PbI 2.55 Br 0.45 (bandgap of 1.65 eV) | C 60 | SnO 2 | Cu. Peak summer performance…
View article: Tailored Crystallization Dynamics for Efficient and Stable DMSO‐Free Tin Perovskite Solar Cells
Tailored Crystallization Dynamics for Efficient and Stable DMSO‐Free Tin Perovskite Solar Cells Open
Tin perovskite solar cells are emerging as a sustainable lead‐free alternative in thin film photovoltaics. DMSO‐free processed tin perovskites are gaining interest due to the detrimental effects of DMSO on tin oxidation. However, replacing…
View article: Co‐Doping Approach for Enhanced Electron Extraction to TiO<sub>2</sub> for Stable Inorganic Perovskite Solar Cells
Co‐Doping Approach for Enhanced Electron Extraction to TiO<sub>2</sub> for Stable Inorganic Perovskite Solar Cells Open
Inorganic perovskite CsPbI 3 solar cells hold great potential for improving the operational stability of perovskite photovoltaics. However, electron extraction is limited by the low conductivity of TiO 2 , representing a bottleneck for ach…
View article: Loss Analysis of P3 Laser Patterning of Perovskite Solar Cells via Hyperspectral Photoluminescence Imaging
Loss Analysis of P3 Laser Patterning of Perovskite Solar Cells via Hyperspectral Photoluminescence Imaging Open
Upscaling perovskite solar cells and modules requires precise laser patterning for series interconnection and spatial characterization of cell parameters to understand laser–material interactions and their impact on performance. This study…
View article: Green Fabrication of Sulfonium‐Containing Bismuth Materials for High‐Sensitivity X‐Ray Detection
Green Fabrication of Sulfonium‐Containing Bismuth Materials for High‐Sensitivity X‐Ray Detection Open
Organic–inorganic hybrid materials based on lead and bismuth have recently been proposed as novel X‐ and gamma‐ray detectors for medical imaging, non‐destructive testing, and security, due to their high atomic numbers and facile preparatio…
View article: Toward Green Processing of Perovskite Solar Cells: Protic Ionic Liquids Enable Water‐ and Alcohol‐Based MAPbI<sub>3</sub> Precursors Inks for Slot‐Die Coating
Toward Green Processing of Perovskite Solar Cells: Protic Ionic Liquids Enable Water‐ and Alcohol‐Based MAPbI<sub>3</sub> Precursors Inks for Slot‐Die Coating Open
Halide perovskite solar cells are approaching commercialization, with solution processing emerging as a key method for large‐scale production. This study introduces a significant advancement: using non‐toxic solvents like water and alcohol…
View article: How Crystallization Additives Govern Perovskite Grain Growth.
How Crystallization Additives Govern Perovskite Grain Growth. Open
The preparation of perovskite solar cells from the liquid phase is a cornerstone of their immense potential. However, a clear relationship between the precursor ink and the resulting perovskite is missing. Established theories, such as het…
View article: A Stage‐Gate Framework for Upscaling of Single‐Junction Perovskite Photovoltaics
A Stage‐Gate Framework for Upscaling of Single‐Junction Perovskite Photovoltaics Open
To address the challenge of upscaling single‐junction perovskite photovoltaics (PV) toward market‐relevant performance in a structured and efficient manner, a stage‐gate approach that divides the process into stages according to technology…
View article: Correlation of Band Bending and Ionic Losses in 1.68 eV Wide Band Gap Perovskite Solar Cells
Correlation of Band Bending and Ionic Losses in 1.68 eV Wide Band Gap Perovskite Solar Cells Open
Perovskite solar cells (PSCs) are promising for high‐efficiency tandem applications, but their long‐term stability, particularly due to ion migration, remains a challenge. Despite progress in stabilizing PSCs, they still fall short compare…
View article: Inkjet-Printed FASn<sub>1–<i>x</i></sub>Pb<sub><i>x</i></sub>I<sub>3</sub>-Based Perovskite Solar Cells
Inkjet-Printed FASn<sub>1–<i>x</i></sub>Pb<sub><i>x</i></sub>I<sub>3</sub>-Based Perovskite Solar Cells Open
Metal halide perovskite solar cells (PSCs) have gained significant attention in thin-film photovoltaic research for their high power conversion efficiency (PCE) and facile fabrication processes. This study presents the use of inkjet printi…
View article: Revisiting Sub-Band Gap Emission Mechanism in 2D Halide Perovskites: The Role of Defect States
Revisiting Sub-Band Gap Emission Mechanism in 2D Halide Perovskites: The Role of Defect States Open
Understanding the sub-band gap luminescence in Ruddlesden-Popper 2D metal halide hybrid perovskites (2D HaPs) is essential for efficient charge injection and collection in optoelectronic devices. Still, its origins are still under debate w…
View article: From Sunrise to Sunset: Unraveling Metastability in Perovskite Solar Cells by Coupled Outdoor Testing and Energy Yield Modelling
From Sunrise to Sunset: Unraveling Metastability in Perovskite Solar Cells by Coupled Outdoor Testing and Energy Yield Modelling Open
Perovskite‐based solar cells exhibit peculiar outdoor performance which is not yet fully understood. The results of outdoor tests may contain hidden, but valuable information that cannot be fully extracted from measurements alone. One such…
View article: Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective
Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective Open
Artificial leaves could be the breakthrough technology to overcome the limitations of storage and mobility through the synthesis of chemical fuels from sunlight, which will be an essential component of a sustainable future energy system. H…
View article: Enhanced Electron Extraction in Co-Doped TiO2 Quantified by Drift-Diffusion Simulation for Stable CsPbI3 Solar Cells
Enhanced Electron Extraction in Co-Doped TiO2 Quantified by Drift-Diffusion Simulation for Stable CsPbI3 Solar Cells Open
Solar cells based on inorganic perovskite CsPbI3 are promising candidates to resolve the challenge of operational stability in the field of perovskite photovoltaics. For stable operation, however, it is crucial to thoroughly understand the…
View article: Optical Analysis of Perovskite III-V Nanowires Interpenetrated Tandem Solar Cells
Optical Analysis of Perovskite III-V Nanowires Interpenetrated Tandem Solar Cells Open
Multi-junction photovoltaics approaches are being explored to mitigate thermalization losses that occur in the absorption of high-energy photons. However, the design of tandem cells faces challenges such as light reflection and parasitic a…
View article: Investigation of perovskite layer growth from solution on textured substrates
Investigation of perovskite layer growth from solution on textured substrates Open
Surface textures are indispensable to minimize optical losses in perovskite-based solar cells. However, the solution-processing of perovskite layers is often not compatible with textured substrates, and little is known about the film growt…
View article: Bicolour, large area, inkjet-printed metal halide perovskite light emitting diodes
Bicolour, large area, inkjet-printed metal halide perovskite light emitting diodes Open
Using a sequential inkjet printing process, we realize bicoloured PeLEDs by selectively dissolving a bromide-based perovskite film with an iodide-based perovskite ink, resulting in red light-emitting features on a green light-emitting back…
View article: Device Performance of Emerging Photovoltaic Materials (Version 4)
Device Performance of Emerging Photovoltaic Materials (Version 4) Open
Following the 3rd release of the “Emerging PV reports” , the best achievements in the performance of emerging photovoltaic (e‐PV) devices in diverse e‐PV research subjects are summarized, as reported in peer‐reviewed articles in academic j…
View article: Rationalizing Performance Losses of Wide Bandgap Perovskite Solar Cells Evident in Data from the <i>Perovskite Database</i>
Rationalizing Performance Losses of Wide Bandgap Perovskite Solar Cells Evident in Data from the <i>Perovskite Database</i> Open
Metal halide perovskites (MHPs) have become a widely studied class of semiconductors for various optoelectronic devices. The possibility to tune their bandgap ( E g ) over a broad spectral range from 1.2 eV to 3 eV by compositional enginee…
View article: Light cycling as a key to understanding the outdoor behaviour of perovskite solar cells
Light cycling as a key to understanding the outdoor behaviour of perovskite solar cells Open
The long-term outdoor performance and stability of Perovskite Solar Cells showed several features that stem from the device's meta-stability. To rationalize this behavior we need indoor ageing experiments with cycled light.
View article: Top-Down or Bottom-up? Growth direction of gas flow-assisted perovskite layers
Top-Down or Bottom-up? Growth direction of gas flow-assisted perovskite layers Open
Photovoltaic devices based on metal halide perovskites have been established as a leading technology for future energetic applications, making scalabledeposition methods, compatible with high-throughput yields, more relevant than ever befo…
View article: Influence of laser fluence and pulse duration on patterning of perovskite solar cells: An analysis of optoelectronic and electrical parameters by hyperspectral photoluminescence imaging
Influence of laser fluence and pulse duration on patterning of perovskite solar cells: An analysis of optoelectronic and electrical parameters by hyperspectral photoluminescence imaging Open
Up-scaling of perovskite solar cells and modules requires both the development of suitable laser patterning processes for series interconnection of the cells and the quantification of the spatial distribution of solar cell parameters. Here…
View article: Managing Excess Lead Iodide with Functionalized Oxo‐Graphene Nanosheets for Stable Perovskite Solar Cells
Managing Excess Lead Iodide with Functionalized Oxo‐Graphene Nanosheets for Stable Perovskite Solar Cells Open
Stability issues could prevent lead halide perovskite solar cells (PSCs) from commercialization despite it having a comparable power conversion efficiency (PCE) to silicon solar cells. Overcoming drawbacks affecting their long‐term stabili…