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International Journal of Photoenergy
Volume 2018, Article ID 2439425, 6 pages
Research Article

LEDs for the Implementation of Advanced Hydrogenation Using Hydrogen Charge-State Control

1School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia
2LONGi Lerri Solar, Xi’an, China

Correspondence should be addressed to Chee Mun Chong;

Received 7 November 2017; Revised 14 January 2018; Accepted 29 January 2018; Published 1 April 2018

Academic Editor: Chun-Sheng Jiang

Copyright © 2018 Chee Mun Chong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Light-induced degradation (LID) of p-type Cz solar cells has plagued the industry for many decades. However, in recent years, new techniques for solving this LID have been developed, with hydrogen passivation of the boron-oxygen defects appearing to be an important contributor to the solution. Advanced hydrogenation approaches involving the control of the charge state for the hydrogen atoms in silicon to enhance their diffusivity and reactivity are developed and evaluated in this work for commercial application using a prototype industrial tool in conjunction with solar cells manufactured on commercial production lines. This prototype tool, unlike the previous successful laser-based laboratory approaches, is based on the use of LEDs for controlling the charge state of the hydrogen atoms. The illumination from the LEDs is also used in this work to passivate process-induced defects and contamination from the respective production lines with significant improvements in both efficiency and stability. The results indicate that the low-cost LED-based industrial tool performs as well as the laser-based laboratory tool for implementing these advanced hydrogen passivation approaches.