19.2%-Efficient Multicrystalline Silicon Solar Cells via Additive-Free Mechanical Grinding Surface Pretreatment for Diamond-Wire-Sawn Wafers

Yujin Jung, Kwan Hong Min, Soohyun Bae, Yoon Mook Kang, Hae Seok Lee, Donghwan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The introduction of diamond wire sawing (DWS) technology has resulted in significant cost reduction in the fabrication of crystalline silicon wafers. However, the DWS process results in parallel wheel marks, saw damage, and formation of an amorphous silicon layer on the surface, which causes difficultly in effectively forming the desired surface texture using conventional acidic etching (also known isotropic etching) techniques for multicrystalline silicon (mc-Si) wafers. In this study, we propose a novel pretreatment grinding (NPTG) technique as a method to address such issues. This is a relatively simple and inexpensive method that does not utilize processes that require the use of expensive equipment, such as vacuum equipment. Additionally, it makes use of environment-friendly procedures that do not require materials such as metal catalysts and additives that cause environmental pollution. The proposed NPTG method provides a good surface topology for effective texturing using a conventional acidic etching solution, and as a result, a uniform texture can be applied to DWS mc-Si wafers. Under the optimized experimental conditions in this study, a weighted average reflectance of 22.63% was achieved after the NPTG was applied. This reflected 6.67% less light than the 29.3% after conventional acidic texturing without the NPTG using DWS mc-Si wafers. Further, a solar cell fabricated using the DWS mc-Si wafers treated with the NPTG method achieved a cell efficiency of approximately 19.2%.

Original languageEnglish
Article number9252965
Pages (from-to)36-42
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume11
Issue number1
DOIs
Publication statusPublished - 2021 Jan

Bibliographical note

Funding Information:
This work was supported in part by theMinistry of Trade, Industry and Energy, Republic ofKorea, through theNewand Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under Grant 20193091010240 and through the Human Resources Program in Energy Technology of the KETEP under Grant 20154030200760 andGrant 20204010600470 and in part by the KU-KIST Graduate School Project.

Funding Information:
Manuscript received August 13, 2020; revised October 11, 2020; accepted October 22, 2020. Date of publication November 9, 2020; date of current version December 21, 2020. This work was supported in part by the Ministry of Trade, Industry and Energy, Republic of Korea, through the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under Grant 20193091010240 and through the “Human Resources Program in Energy Technology” of the KETEP under Grant 20154030200760 and Grant 20204010600470 and in part by the KU-KIST Graduate School Project. (Corresponding author: Donghwan Kim.) Yujin Jung, Soohyun Bae, and Donghwan Kim are with the Department of Materials Science and Engineering, Korea University, Seoul 02841, South Korea (e-mail: yujin0906@korea.ac.kr; ramun16@korea.ac.kr; solar@korea.ac.kr).

Publisher Copyright:
© 2011-2012 IEEE.

Keywords

  • Acidic etching
  • PERC solar cell
  • acidic texturing
  • additive-free texturing
  • diamond wire sawn texturing
  • isotropic etching
  • multicrystalline passivated emitter and rear cell (PERC)
  • multicrystalline silicon solar cell
  • multicrystalline silicon texturing
  • nonmetal catalyst texturing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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