Center for Molecular Spectroscopy and Dynamics

2017 119th KCS Meeting

Organic photovoltaics composed of conducting copolymer and fullerenes have many advantages compare to silicon based solar cell such as low-cost, light-weight, solubility, flexibility etc. Moreover, with consistent efforts, power conversion efficiency of OPVs comes up to 12%, OPV shows promising potential to commercialization. However, there is another obstacle to use OPV in daily basis. Because conducting polymer easily goes degradation process in ambient condition and results in sunlight absorption decrease which drops the device performance. Previously, we investigated the degradation process by using Infra-red spectroscopy to know intermediate structure and find out the degradation process strongly related to backbone conjugation breakage. In this work, to see how backbone conjugation affects more sensitively, we use Raman spectroscopy. Furthermore, we use 3 different wavelength laser to show wavelength dependency of degradation process. I hope our findings provide insight into the degradation mechanism of conjugated copolymer and dedicate to progress in OPV devices