Improved reliability PERC PV modules with moth-eye nanostructured optical films using nano imprint lithography

Abstract In this study, a Moth-eye nanostructured optical film was studied to improve the reliability of the PERC PV module. Moth-eye nanostructures were composed of three types by using the Nano Imprint Lithography method and different process conditions. These are initial optical film, Moth-Eye structure (MES) optical film, and Improved Moth-Eye structure (I-MES) optical film. The I-MES film had a transmittance of 99%. Compared with the Initial film, transmittance increased by 4%. Also, PERC mini modules were manufactured using these three types of optical films and I-V analysis was performed. The Power output (Pmax) of the I-MES PV module is 4.324 W, which is a 5.5% increase compared to the Initial PV module. In addition, one of the IEC-61215 reliability Damp-heat test was conducted for 1000 h. The I-MES PV modules showed only a 0.8% degradation compared to the Initial PV modules, and it increased by 2.4% compared to the MES PV modules. These results indicate that they are suitable for increasing the long-term reliability of PV modules.