A Grain Orientation-Independent Single-Step Saw Damage Gettering/Wet texturing Process for Efficient Silicon Solar Cells

Yujin Jung, Kwan Hong Min, Regina Post, Wolfram Kwapil, Martin C. Schubert, Donghwan Kim, Yoonmook Kang, Hae Seok Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Improving electrical and optical properties is important in manufacturing high-efficiency solar cells. Previous studies focused on individual gettering and texturing methods to improve solar cell material quality and reduce reflection loss, respectively. This study presents a novel method called saw damage gettering with texturing that effectively combines both methods for multicrystalline silicon (mc-Si) wafers manufactured using the diamond wire sawing (DWS) method. Although mc-Si is not the Si material currently used in photovoltaic products, the applicability of this method using the mc-Si wafers as it contains all grain orientations is demonstrated. It utilizes saw damage sites on the wafer surfaces for gettering metal impurities during annealing. Additionally, it can crystallize amorphous silicon on wafer surfaces generated during the sawing process to allow conventional acid-based wet texturing. This texturing method and annealing for 10 min allow for the removal of metal impurities and effectively forms a textured DWS Si wafer. The results show that the open-circuit voltage (ΔVoc = +29 mV), short-circuit current density (ΔJsc = +2.5 mA cm−2), and efficiency (Δη = +2.1%) improved in the p-type passivated emitter and rear cells (p-PERC) manufactured using this novel method, as compared to those in the reference solar cells.

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 2023

Bibliographical note

Funding Information:
The authors are grateful to Dr. Florian Schindler, Dr. Tim Niewelt, and Pascal Messmer for advice on the iron experimental analysis. : The authors acknowledge financial support from the National Research Foundation (NRF) grant funded by the Korean government (MSIT) (No. NRF‐2022R1A2C1012663). This research is supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), and the Ministry of Trade, Industry, and Energy of the Republic of Korea (No. 20193020010390). Funding

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • acidic texturing
  • gettering
  • micro texture
  • saw damage gettering
  • silicon solar cells

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • General Chemistry
  • General Materials Science
  • Biotechnology
  • Biomaterials

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