Open AccessEnhancement of laser-induced rear surface spallation by pyramid textured structures on silicon wafer solar cells
Author(s) -
Zhe Du,
Natalia Palina,
J Chen,
Armin G. Aberle,
Bram Hoex,
Minghui Hong
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.00a984
Subject(s) - materials science , optics , laser , wafer , laser ablation , fluence , spallation , optoelectronics , solar cell , ablation , silicon , physics , engineering , quantum mechanics , neutron , aerospace engineering
Pulsed laser ablation is increasingly being applied to locally open the rear dielectric layer of advanced silicon wafer solar cell structures, such as aluminum local back surface field solar cells. We report that the laser ablation process on the rear surface of the solar cell at a relatively low laser fluence can cause undesirable spallation at the front surface which is textured with random upright pyramids. This phenomenon is attributed to the enhancement of the surface spallation effect by up to 3 times due to the confinement of the pressure waves at the tips of these random pyramids. Laser ablation at different laser focus positions and laser fluences is carried out to achieve optimized laser processing of the solar cells.