In terms of conductivity related characteristics, Eddy Current tests were compared with Electroluminescence tests. As each technology has its own limitations, the comparison is not about judgment for availability of measurement criteria. But it is about the inspection for potentially detectable defects, only discovered by Eddy Current test. This is mainly due to the principle of Eddy Current that is based on material’s conductivity. Additionally, this comparison would be beneficial for the reliability test as previously mentioned about the potential defects. The sample #2 and #3, once tested by Eddy Current were selected for Electroluminescence test comparison. Results are shown in Fig. 10. The square shapes indicate defects observed by both technologies whereas the round shape point to defects only detected by Eddy Current test. To differentiate a type of defects, the square shape marked defects are described as broken contacts while the round shape marked defects are bad contacts. In the sample #2 in Fig.10, two more bad contacts are detected by the EC test. Also, one more bad contact is visible in Sample #3’s EC test. It notes that bad contacts are located even if the performance of a solar cell is not much influenced for the moment. Potentially, the bad contacts are deteriorative and eventually broken. Since a solar cell functions for more than 25 years, those delicate defects must not be overlooked. Therefore, it needs to be an important criteria considered for long term reliability and performance degradation.