Directional heating and cooling for controlled spalling
- authored by
- Jan Hensen, Raphael Niepelt, Sarah Kajari-Schroder, Rolf Brendel
- Abstract
The fabrication of thin solar cells by kerfless wafering techniques offers a high potential for the reduction of photovoltaic costs. We present an experimental setup for the exfoliation of thin crystalline silicon foils from a silicon substrate induced by the difference in thermal expansion coefficient of the silicon and an aluminum stressor layer at moderate temperatures. A moving temperature gradient across the substrate controls the crack propagation parallel to the silicon surface. We measure and simulate the spatial temperature distribution during thermal treatment and find that the direction of crack propagation is controlled by the temperature distribution. We detach foils with an area of 19.6 cm2 with thickness values ranging from 50 to 80 μm within one layer. The foils have a smooth surface with some irregularities near the edge.
- Organisation(s)
-
Solar Energy Section
- External Organisation(s)
-
Institute for Solar Energy Research (ISFH)
- Type
- Article
- Journal
- IEEE journal of photovoltaics
- Volume
- 5
- Pages
- 195-201
- No. of pages
- 7
- ISSN
- 2156-3381
- Publication date
- 01.01.2015
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Electrical and Electronic Engineering
- Sustainable Development Goals
- SDG 7 - Affordable and Clean Energy
- Electronic version(s)
-
https://doi.org/10.1109/JPHOTOV.2014.2371233 (Access:
Unknown)
