ZnO layer onto Si surface by continuous spray pyrolysis reactor for solar cell efficiency enhancement

Abstract

The present investigation reports improvement of electrical parameters such as short circuit current and so efficiency of Si solar cell device by the deposition of ZnO layers onto Si surface via continuous spray pyrolysis reactor even under low temperature deposition conditions. In order to achieve this improvement, the ZnO layers are optimized directly on Si solar cell using kapton tape. This masking tape is helping to improve adhesion of ZnO layer along with changed surface morphology which is confirmed with respective SEM images. The report also suggests seed layer dominance in the resultant ZnO growth which is confirmed by changing precursor solution from Zinc acetate to Titanium tetraisopropoxide. The report is supported by XRD, SEM, reflectance and I-V measurements. The study suggest, if ZnO layers are suitably designed by this reactor on Si surface, the improvement in optical coupling can be achieved in cost effective manner for existing industrial Si solar cell fabrication line.