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Preparation of Large Size Pyramidal Texture on N-Type Monocrystalline Silicon Using TMAH Solution for Heterojunction Solar Cells

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Abstract:

Pyramidal texture is one traditional method to realize antireflection for c-Si solar cells, due to its low cost and simplicity. As one high efficiency silicon solar cell, amorphous/crystalline silicon heterojunction (SHJ) solar cell has attracted much attention all over the world. The heterojunction interface with very low defects and interface states is critical to the SHJ solar cell performance. In order to obtain high quality interface passivation by depositing a very thin intrinsic amorphous silicon layer on the textured Si conformally, large size pyramidal texture with no metal ion contamination is required. In this work, we utilized tetra-methyl ammonium hydroxide (TMAH) instead of NaOH in the alkaline etching to prepare pyramidal texture on N-type monocrystalline silicon to avoid the possible Na+ contamination. By optimizing the etching conditions, uniform large size pyramidal texture with pyramid size of about 10 μm was fabricated successfully. Furthermore, excellent antireflection performance was demonstrated on such textured Si surface. The average reflectance was lower than 10% in the visible and near infrared spectrum range. Such pyramidally textured Si wafers will be very suitable for SHJ solar cells.

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Periodical:

Advanced Materials Research (Volumes 476-478)

Pages:

1815-1819

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.476-478.1815

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Online since:

February 2012

Authors:

Jing Wei Chen, Lei Zhao, Su Zhou, Hong Wei Diao, Ye Hua Tang, Bao Jun Yan, Wen Jing Wang

Keywords:

Alkaline Etching, Antireflection, Heterojunction Solar Cell, Pyramidal Texture

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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