Mechanical wafer engineering for high efficiency solar cells: An investigation of the induced surface damage
- Univ. of Konstanz (Germany). Faculty of Physics
- IMEC, Leuven (Belgium)
During mechanical structuring of crystalline silicon an electronically active surface damage layer is induced whose complete removal is a prerequisite for the preparation of highly efficient mechanically textured multicrystalline silicon solar cells. In order to evaluate the presently unknown damage layer thickness of mechanically textured silicon, electron microscopy studies and microwave reflection lifetime measurements in combination with a step etching procedure were performed using mono and multicrystalline silicon as base material. The influence of the diamond grain size and the lateral cutting speed of the beveled sawing blades on the surface damage was studied to obtain a better understanding of the mechanical structuring of silicon. In order to confirm the results obtained from lifetime measurements, screenprinted mechanically V-grooved solar cells were processed with different etching times during the sawing damage removal process step. It could be shown that the electronically active surface damage layer has a thickness of about 3 {micro}m when applying standard grooving parameters and a diamond grain size of 4--6 {micro}m within the abrasive.
- OSTI ID:
- 191022
- Report Number(s):
- CONF-941203--; ISBN 0-7803-1459-X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CURRENT DENSITY
DAMAGE
DIAMONDS
EFFICIENCY
ELECTRIC POTENTIAL
EXPERIMENTAL DATA
FILL FACTORS
LIFETIME
MACHINING
METALS
MICROWAVE SPECTRA
PERFORMANCE
PHOTOCONDUCTIVITY
SCANNING ELECTRON MICROSCOPY
SILICON NITRIDES
SILICON OXIDES
SILICON SOLAR CELLS
SURFACE COATING
TEXTURE