疲労負荷下におけるフレキシブル太陽電池の発電性能劣化過程のAEおよびLTモニタリング

抄録

Flexible solar cells are subjected to the external load in usual service. If the loading was excessive, the electrical performance degradation of flexible solar cell would be resulted due to the microdamages with specific fracture mode and position. It is then necessary to identify those microdamages and clarify the mechanism of performance degradation of flexible solar cell. Some mode of microdamages cause shunts which result in the electrical degradation of flexible solar cells. Our previous study enabled to identify specific microdamage contributing to the electrical performance degradation under static and cyclic tensile loadings. In the present study, cyclic tensile tests were carried out under the 0.8% and 1.2% maximum strains. Microdamages initiation and accumulation were detected by the acoustic emission (AE) technique and the electrical degradation behavior was monitored by current-voltage characteristics. Furthermore, the contribution of microdamages were identified using the lock-in thermography (LT) technique. Consequently, the initiation and accumulation behavior of microdamages in flexible solar cells were identified, and those contributions to the electrical degradation was characterized.