Sebastian Tepner
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View article: Transition from silver-to copper-based screen printed SHJ solar cells
Transition from silver-to copper-based screen printed SHJ solar cells Open
In this work, we demonstrate the possibility to reduce silver consumption for highly efficient silicon heterojunction (SHJ) cells by screen printing using low temperature paste based on silver, silver-coated copper or pure copper particles…
View article: Transition from Silver- to Copper-Based Screen Printed Shj Solar Cells
Transition from Silver- to Copper-Based Screen Printed Shj Solar Cells Open
View article: Screen Printing Catalyst Inks With Enhanced Process Stability for PEM Fuel Cell Production
Screen Printing Catalyst Inks With Enhanced Process Stability for PEM Fuel Cell Production Open
Current state‐of‐the‐art coating techniques for PEM fuel cell electrode manufacturing such as slot‐die coating use closed ink reservoirs, allowing low boiling point solvents as the dispersion matrix for solid components of the catalyst ink…
View article: Prediction of Screen‐Printed Electrodes with Fine‐Line and Arbitrary Structures
Prediction of Screen‐Printed Electrodes with Fine‐Line and Arbitrary Structures Open
Currently, the photovoltaic manufacturing industry is confronted with an upcoming material shortage, primarily driven by the continued dependence on silver for front‐side metallization in TOPCon, SHJ, and PERC solar cells. This study emplo…
View article: Deep learning-based prediction of 3-dimensional silver contact shapes enabling improved quality control in solar cell metallization
Deep learning-based prediction of 3-dimensional silver contact shapes enabling improved quality control in solar cell metallization Open
The industrial metallization of Si solar cells predominantly relies on screen printing, with silver as the preferred electrode material. However, the design of commercial screens often leads to suboptimal silver usage and increased electri…
View article: Paste-based silver reduction for iTOPCon rear side metallization
Paste-based silver reduction for iTOPCon rear side metallization Open
This work presents two approaches to reduce the silver (Ag) amount on the rear side of M2-sized industrial tunnel oxide passivated contact (iTOPCon) solar cells by (partially) substituting conventional Ag pastes with copper (Cu) and alumin…
View article: Curing conditions for low‐resistivity contacts on transparent conductive oxide layers for different solar cell applications
Curing conditions for low‐resistivity contacts on transparent conductive oxide layers for different solar cell applications Open
The Cu (ln 1‐x Ga x )Se 2 (CIGS) solar cell technology is a potentially high‐efficient approach with unique properties compared with silicon photovoltaic, like flexible lightweight substrates and different colored designs. So far, the full…
View article: Paste Development for an Optimized Filament Stretching Effect during Parallel Dispensing on Transparent Conductive Oxide Layers for Solar Cell Metallization
Paste Development for an Optimized Filament Stretching Effect during Parallel Dispensing on Transparent Conductive Oxide Layers for Solar Cell Metallization Open
The availability of silver as an electrically conductive filler material in printing pastes for solar cell metallization is becoming a more crucial issue for multiterawatt‐scale production due to its global constraints. Therefore, the silv…
View article: Printing technologies for silicon solar cell metallization: A comprehensive review
Printing technologies for silicon solar cell metallization: A comprehensive review Open
This paper presents a comprehensive overview on printing technologies for metallization of solar cells. Throughout the last 30 years, flatbed screen printing has established itself as the predominant metallization process for the mass prod…
View article: High-Frequency Rheological and Piezo-Voltage Waveform Characterization of Inkjet-Printed Polymer-Based Dopant-Source Inks
High-Frequency Rheological and Piezo-Voltage Waveform Characterization of Inkjet-Printed Polymer-Based Dopant-Source Inks Open
This work focuses on developing an understanding of the rheological properties of polymer-based dopant-source inks at the timescales relevant to inkjet printing and their corresponding roles in determining the production of defect-free dro…
View article: Challenges of fabricating catalyst layers for PEM fuel cells using flatbed screen printing
Challenges of fabricating catalyst layers for PEM fuel cells using flatbed screen printing Open
In this work, flatbed screen printing is evaluated regarding its capability to produce catalyst layers of PEM fuel cells. In the field of printed electronics, screen printing is regarded as robust and high-throughput coating technology. Th…
View article: Filament stretching during micro-extrusion of silver pastes enables an improved fine-line silicon solar cell metallization
Filament stretching during micro-extrusion of silver pastes enables an improved fine-line silicon solar cell metallization Open
View article: Filament stretching during parallel dispensing – A way to reduce silver consumption in SHJ metallization
Filament stretching during parallel dispensing – A way to reduce silver consumption in SHJ metallization Open
In the field of silicon heterojunction (SHJ) solar cells, great successes on improving production processes have been achieved in the last years, however further improvements in the case of metallization are required to obtain higher marke…
View article: Rotary Screen Printed Metallization of Heterojunction Solar Cells: Toward High‐Throughput Production with Very Low Silver Laydown
Rotary Screen Printed Metallization of Heterojunction Solar Cells: Toward High‐Throughput Production with Very Low Silver Laydown Open
Within this work, first bifacial silicon heterojunction solar cells with rotary screen printed front‐ and rear‐side metallization are demonstrated. The high‐throughput metallization process is carried out using an innovative rotary printin…
View article: Increasing the Effective Area of Small‐Sized CIGS Modules by Printed Ag Front Contacts
Increasing the Effective Area of Small‐Sized CIGS Modules by Printed Ag Front Contacts Open
Despite the high‐efficiency potential of the Cu(In 1− x Ga x )Se 2 (CIGS) technology, its global market share is still relatively small. One reason for that is the comparatively low active module area caused by small cell widths and theref…
View article: Progress with Screen Printed Metallization of Silicon Solar Cells - Towards 20 Μm Line Width and 20 Mg Silver Laydown for Perc Front Side Contacts
Progress with Screen Printed Metallization of Silicon Solar Cells - Towards 20 Μm Line Width and 20 Mg Silver Laydown for Perc Front Side Contacts Open
View article: A model for screen utility to predict the future of printed solar cell metallization
A model for screen utility to predict the future of printed solar cell metallization Open
View article: Evolutionary algorithm optimizes screen design for solar cell metallization
Evolutionary algorithm optimizes screen design for solar cell metallization Open
Today’s PV production chain heavily relies on screen printing as the predominant metallization process because of its robust production capabilities. However, the continuous demand to further increase throughput rates while at the same tim…
View article: The project »Rock-Star«: The evolution of rotary printing for solar cell metallization
The project »Rock-Star«: The evolution of rotary printing for solar cell metallization Open
Within this work, we provide a comprehensive overview about research activities and current status with respect to rotary printed metallization for silicon solar cells. We will present the major results of the research project »Rock-Star« …
View article: Dispensing of low-temperature silver pastes
Dispensing of low-temperature silver pastes Open
This paper shows the application of three low-temperature silver pastes on silicon heterojunction (SHJ) solar cells and Cu(In1-xGax)Se2 modules by parallel dispensing and flatbed screen printing. The goal was to improve the finger shape as…
View article: CIGS Mini‐Modules with Dispensed Metallization on Transparent Conductive Oxide Layer
CIGS Mini‐Modules with Dispensed Metallization on Transparent Conductive Oxide Layer Open
This article presents the application of a parallel dispensing device for low‐temperature silver paste metallization on transparent conductive oxide (TCO) layers of Cu(In 1 − x Ga x )Se 2 (CIGS) substrates as an alternative metallization t…
View article: The Link between Ag‐Paste Rheology and Screen‐Printed Solar Cell Metallization
The Link between Ag‐Paste Rheology and Screen‐Printed Solar Cell Metallization Open
Today's photovoltaic production chain is moving into a material crisis as the use of silver for front‐side metallization of passivated emitter and rear contact solar cells remains a crucial requirement. The shared effort of the scientific …
View article: Screen pattern simulation for an improved front‐side Ag‐electrode metallization of Si‐solar cells
Screen pattern simulation for an improved front‐side Ag‐electrode metallization of Si‐solar cells Open
Flatbed screen printing proves to be the dominant metallization approach for mass production of silicon (Si)‐solar cells because of its robust and cost‐effective production capability. However, the ongoing demand of the PV industry to furt…
View article: Conductive Highly Filled Suspensions for an Electrochemical Dispensing Approach to Pattern Full-Area Thin Metal Layers by Physical Vapour Deposition
Conductive Highly Filled Suspensions for an Electrochemical Dispensing Approach to Pattern Full-Area Thin Metal Layers by Physical Vapour Deposition Open
This paper presents a systematic approach for the development of highly filled suspensions used for an electrochemical dispensing approach. Electrochemical dispensing is an alternative structuring process to locally pattern PVD full-area t…
View article: Studying Knotless Screen Patterns for Fine-line Screen Printing of Si-Solar Cells
Studying Knotless Screen Patterns for Fine-line Screen Printing of Si-Solar Cells Open
Flatbed screen printing is the dominating process in industry for metallization of silicon solar cells. It offers high throughput rates, high flexibility of printing pattern, and an overall very cost-effective production compared with othe…
View article: The International Technology Roadmap for Photovoltaics and the Significance of Its Decade-Long Projections
The International Technology Roadmap for Photovoltaics and the Significance of Its Decade-Long Projections Open
The International Technology Roadmap for Photovoltaics (ITRPV) is a leading roadmap in the PV community. Ever since its first edition has been published in 2010, the ITRPV has succeeded to provide the technology projections in crystalline …
View article: Project "Rock-Star" – High-Speed Rotary Printing for Solar Cell Metallization: From Vision to Reality
Project "Rock-Star" – High-Speed Rotary Printing for Solar Cell Metallization: From Vision to Reality Open
Within this work, we will present the machine concept and the first results of passivated emitter and rear contact (PERC) solar cells fabricated on an innovative high-throughput rotary printing demonstrator machine which has been developed…
View article: Towards 3D-lithium ion microbatteries based on silicon/graphite blend anodes using a dispenser printing technique
Towards 3D-lithium ion microbatteries based on silicon/graphite blend anodes using a dispenser printing technique Open
Silicon/carbon–graphite blend slurries designed for 3D-dispenser printed lithium ion microbatteries systematically characterized by rheological and electrochemical methods.
View article: Low-temperature Ag-Paste Screening for Silicon Heterojunction Solar Cells and Modules
Low-temperature Ag-Paste Screening for Silicon Heterojunction Solar Cells and Modules Open
This paper addresses the testing of eleven different low-temperature pastes (LTP) for silicon heterojunction (SHJ) solar cells. In the LTP screening different pastes from different suppliers were printed on the front side of industrial rea…
View article: "Project FINALE" - Screen and Screen Printing Process Development for Ultra-Fine-Line Contacts below 20µm Finger Width
"Project FINALE" - Screen and Screen Printing Process Development for Ultra-Fine-Line Contacts below 20µm Finger Width Open
Within this work, a new model of the screen printing process is set up in order to improve the understanding of the screen printing process with focus on the interaction between -paste and -screen. First results show that wall slip behavio…