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Characterization of Damage in a-Si/a-SiGe Flexible Solar Cells under Mechanical Strain by AE Technique and Lock-in Thermography
H. Tazawa, T. Sakai, S. Wakayama
Lock-in Thermography, Flexible Solar Cell, AE Detection of Damage
Subtopic: Silicon-based Thin Film Solar Cells
Event: 28th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3CV.1.33
2533 - 2536
ISBN: 3-936338-33-7
Paper DOI: 10.4229/28thEUPVSEC2013-3CV.1.33
0,00 EUR
Document(s): paper


The tensile tests of a-Si/a-SiGe flexible solar cells were carried out. Mechanical damage was characterized by acoustic emission (AE) technique and lock-in thermography (LT). The leak current was also monitored as a measure of the electrical performance degradation. The leak current rapidly increased at the strain of ~1.4 %, and it was observed by LT that the temperature modulation around a penetrating hole increased critically. The AE technique detected damages earlier than the increase in the leak current, which indicated that the AE technique was more sensitive to damage than the leak current measurement. Especially, the AE sensor attached on the penetrating hole detected AE signals earlier than the others. It is suggested by LT and AE technique that the increase in the leak current was derived from the microdamage accumulation around the penetrating holes. Furthermore, the detailed observation around a penetrating hole demonstrated that the dominant damages around the holes were microcracks perpendicular to the loading direction. Consequently, the failure process in flexible solar cells was well characterized by the LT, AE technique and in-situ observation.