A5064861724- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Photovoltaic System Optimization Techniques
- solar cell performance optimization
- Technology Assessment and Management
- Photovoltaic Systems and Sustainability
- Magnetic and transport properties of perovskites and related materials
- Intellectual Property and Patents
- Innovation Policy and R&D
- Economic and Technological Innovation
- Electron and X-Ray Spectroscopy Techniques
- Silicon Nanostructures and Photoluminescence
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
Fraunhofer Institute for Solar Energy Systems
2018-2023
Verband Deutscher Maschinen- und Anlagenbau
2023
Fraunhofer Institute for Physical Measurement Techniques
2022
University of Freiburg
2022
This article introduces a postmetallization "passivated edge technology" (PET) treatment for separated silicon solar cells consisting of aluminum oxide deposition with subsequent annealing. We present our work on bifacial shingle that are based the passivated emitter and rear cell concept. To separate devices after metallization firing, we use either conventional laser scribing mechanical cleaving (LSMC) process or thermal separation (TLS) process. Both processes show similar pseudo fill...
Abstract This work shows the first demonstration of thermal laser separation (TLS) and post‐metallization passivated edge technology (PET) applied to tunnel‐oxide contact (TOPCon) shingle solar cells. The cells with 26.46 mm × 158.75 size are separated from industrial full‐square TOPCon host singulation is performed either by TLS front side (emitter side) or conventional scribe mechanical cleaving (LSMC) rear (emitter‐free side). optimized in this yields up 0.2% abs more efficient after...
We investigate different postseparation process routes for silicon heterojunction (SHJ) half solar cells, separated by thermal laser separation. SHJ cells with and without aluminum oxide (Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) deposition as edge passivation layer undergo annealing processes, including i) a hotplate; ii) an inline oven; iii) ultrafast light soaking...
Shingled interconnection of solar cells allows increased output power density p out by (i) increasing the active cell area within module, (ii) decreasing shading losses, and (iii) reducing both series resistance per as well losses. An additional increase in is possible shingled using bifacial cells, allowing light capture from rear side well. The “p‐type silicon passivated edge, emitter, (pSPEER)” concept introduced examined this work an approach for fabrication shingle based on emitter...
This article investigates thermal laser separation (TLS) on p-type Czochralski-grown silicon (Cz-Si) passivated emitter and rear cells (PERC) n-type Cz-Si heterojunction (SHJ) solar cells. The TLS comprises of two laser-based processes: the crack initiation by a scribe propagation cleave process leading to separated with smooth edge surfaces. sole impact cells' passivation layers is examined performing it without initial scribe, not separating samples. By means photoluminescence imaging,...
Edge losses in silicon solar cells are becoming more important current photovoltaic research, especially shingled cell modules with high perimeter to area ratios. Hence, this study a new approach is presented quantify edge recombination by using photoluminescence (PL) measurements combined device modelling. The main focus of work determine and separate the contribution two relevant losses: (i) at bulk edge, described an effective surface velocity Seff,edge, (ii) pn-junction edge-length...
Abstract The investigation of novel cell‐to‐cell interconnection methods has gained importance with the increase wafer sizes. Shingling (i.e., overlapping) solar cells is not only a solution for smaller but also chance to output power density by (i) increasing active cell area within module, (ii) decreasing shading losses, and (iii) reducing electrical losses. Replacing commonly used expensive materials such as silver in cell's electrodes electrically conductive adhesive increases...
Shingling is an alternative method to conventional wire soldering for the interconnection of solar cells in PV modules. In this article production sequence from host shingled modules explained. The efficiency changes along process chain are analyzed theoretically and by experiment. I-V characterization overesti-mates later separated shingles, which measured front side busbar back busbar, because finger resistance effect. Additionally, edge recombination further reduces efficiency, but half...
The concepts of bifaciality and shingling interconnection allow for a boost in output power density pout silicon-based photovoltaic modules. This work examines silicon-based, bifacial shingle solar cells called "p-type shingled passivated edge, emitter, rear (pSPEER)". A specially designed metallization layout on industrial 6-inch p-type Czochralski-grown silicon precursors is contact fired to obtain the host wafer. Six pSPEER each an area 23 mm x 148 are obtained by newly integrated thermal...
We present results in post-metallization "passivated edge technology" (PET) and its application on bifacial p-type silicon shingle solar cells. Host cells (full with metallization layout after contact firing) separated by either thermal laser separation (TLS) or conventional scribe mechanical cleave (LSMC) show similar drops pseudo fill factor pFF of -1.2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> <sub...
Second‐order and first‐order magnetocaloric materials (MCMs) not experiencing hysteresis are characterized by a reversible temperature change when exposed to an applied magnetic field. Due this property described the effect, MCMs used in cooling applications. Conversely, rapid variation of MCM's around its specific Curie causes fast permeability. Cycling within field allows possibility inducing voltage, which would be higher for cycling rates. Herein, latent heat transfer is introduced as...