Premium
Imaging physical parameters of pre‐breakdown Sites by lock‐in thermography techniques
Author(s) -
Breitenstein O.,
Bauer J.,
Wagner J.M.,
Lotnyk A.
Publication year - 2008
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.848
Subject(s) - thermography , impact ionization , ionization , materials science , silicon , optics , optoelectronics , chemistry , physics , infrared , ion , organic chemistry
Local pre‐breakdown sites in solar cells can be studied by lock‐in thermography (LIT). Three new LIT techniques are proposed and demonstrated here, which are TC‐DLIT for studying the local temperature coefficient of pre‐breakdown sites, Slope‐DLIT for measuring the normalized local slope of the I–V characteristics, and MF‐ILIT for imaging the local carrier multiplication factor. First results on multicrystalline silicon cells show that the pre‐breakdown mechanism cannot completely be described by the conventional impact ionization and internal field emission models. Copyright © 2008 John Wiley & Sons, Ltd.