Study of light-induced degradation of polymer: fullerene solar cells. (19th May 2022) - Sharma, Abhishek
Abstract : In the present study, the role of active and transport layer materials in the degradation mechanism is studied using different device geometries. Abstract : In the present study, the role of active and transport layer materials in the degradation mechanism is studied using different device geometries. Initially, the absorbance of the active layer materials as a function of the degradation time is compared with the photovoltaic characteristics. Also, it has been found that the hole- and electron-transport layers play a pivotal role in the degradation process for the observed decreased device efficiency. The theoretical charge-transport model complements these experimental photovoltaic parameters well. The results are attributed to the change in the quasi-Fermi level, and exciton splitting for the fresh and aged devices. These interesting and impactful results reveal a basic understanding of the degradation mechanism for the P3HT:PC71 BM and PTB7:PC71 BM blend systems and provide insights for achieving long-term stability in such solar-cell devices.