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Effects of different laser modified surface morphologies and post-texturing cleanings on c-Si solar cell performance.

Authors :
Radfar, Behrad
Es, Fırat
Turan, Raşit
Source :
Renewable Energy: An International Journal. Jan2020, Vol. 145, p2707-2714. 8p.
Publication Year :
2020

Abstract

Performance of crystalline Silicon solar cells depends on numerous factors. One key factor is a surface structure which can restrict electrical and optical properties due to recombination of generated carriers and reflection of incident light. Surface texturing reduces reflection from a flat surface which increases absorption of light. Anisotropic alkaline etchants are commonly used for texturing mono-crystalline Silicon wafers which produce pyramid structures on the surface. Because of randomly oriented crystallographic grains, this method is not feasible for multi-crystalline Silicon wafers. Here, an alternative texturing process using a laser system is proposed. Laser beam creates vertical and horizontal grooves on the surface in which the intersections are for a light trapping purpose. Laser parameters are determined experimentally to have the lowest reflection. Next, chemical post-texture cleaning is performed to remove laser-induced damages and other residues. Finally, samples went through general solar cell fabrication steps. For characterizations, weighted reflection is measured and correlated with Scanning Electron Microscopy images of a textured surface to evaluate the performance of texturing and post-texture cleaning. To examine fabricated solar cells' performance, I–V curve and External Quantum Efficiency are measured. Results indicate that proposed processes lead to an improved efficiency compared to reference samples. • Optimizing laser texturing as an isotropic texturing method by optimizing laser parameters. • Optimizing post-texture cleaning method using KOH solution with proper parameters. • Fabricating solar cell based on optimum laser texturing and post-texture cleaning parameters. • Achieving considerably low weighted reflection by laser texturing and depositing ARC. • Improving conversion efficiency of conventional c-Si solar cell comparing to reference cell. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09601481
Volume :
145
Database :
Academic Search Index
Journal :
Renewable Energy: An International Journal
Publication Type :
Academic Journal
Accession number :
139058702
Full Text :
https://doi.org/10.1016/j.renene.2019.08.031