Showing papers by "Aleksandra Drygała published in 2008"
TL;DR: In this article, a new approach to surface texturization of multicrystalline silicon wafers was developed by means of laser surface treatment and a special etching procedure was applied to remove laser-damaged layer.
116 citations
Journal Article•
71 citations
Journal Article•
TL;DR: In this article, the texturing of polycrystalline silicon surface using Nd:YAG laser makes it possible to increase absorption of the incident solar radiation, and the additional technological operation consisting in etching in 20% KOH solution at temperature of 80oC introduced into technology of the photovoltaic cells manufactured from laser textured wafers allows for significant improvement in their electrical performance compared to cells produced from the non-textured wafer after saw damage removal.
Abstract: Purpose: This paper presents technology of multicrystalline silicon solar cells with laser texturization step. The texturing of polycrystalline silicon surface using Nd:YAG laser makes it possible to increase absorption of the incident solar radiation. Moreover, the additional technological operation consisting in etching in 20% KOH solution at temperature of 80oC introduced into technology of the photovoltaic cells manufactured from laser textured wafers allows for significant improvement in their electrical performance compared to cells produced from the non-textured wafers after saw damage removal. Design/methodology/approach: The topography of laser textured surfaces were investigated using DSM 940 OPTON scanning electron microscope and LSM 5 Pascal ZEISS confocal laser scanning microscope. The reflectance of produced textures was measured by Perkin-Elmer Lambda spectrophotometer with an integrating sphere. Electrical parameters of manufactured solar cells were characterized by measurements of I-V light characteristics under standard AM 1.5 radiation. Findings: Solar cells manufactured from laser-textured polycrystalline silicon wafers demonstrate worse electrical performance than cells manufactured from the non-textured wafers after saw damage removal as well as wafers textured by etching in alkaline solutions. Etching of textured surface in 20% KOH solution at temperature of 80oC subsequent to laser processing shows to have a greatly increased impact on electrical performance of solar cells. Research limitations/implications: Continued etching to remove laser induced defects cause the texture to flatten out reducing it optical effectiveness. Originality/value: This paper demonstrates, that laser processing is very promising technique for texturing multicrystaline silicon independent on grains crystallographic orientation compared to conventional texturing methods in technology of solar cells.
26 citations