Effective Variables To Control the Fill Factor of Organic Photovoltaic Cells

Effective cell design variables having a large impact on the fill factor (FF) of organic photovoltaic cells (OPVCs) were systematically identified using a general device structure of, ITO/PEDOT:PSS/P3HT + PCBM/LiF/Al. The results show that the characteristic peoperties of the organic-layer, such as morphology and thickness, the regioregularity of the conjugated polymer, and the two interfaces between the electrodes and the blend layer have a large influence on the FF by affecting the series resistance (R-s) and the shunt resistance (R-sh). The systematic investigation described in this contribution provides a comprehensive understanding of the correlation between the device variables and R-s and R-sh and a way to control FF, which is critically important to achieving a high performance OPVC.