Insights into Excited States Dynamics in Organic Photovoltaic Materials

Understanding the excited states dynamics in organic semiconductors is crucial for optimizing their photovoltaic performance. In this work, we explore the effect of the additives, such as chloronaphthalene (CN), on high-efficiency photovoltaic blends, in particular PM6 with Y6 derivatives, Zy4Cl and Y7BO. Using visible and near-infrared time-resolved photoluminescence (Vis/NIR TRPL) and excitation-dependent photoluminescence quantum yield (PLQY), we explore how these additives influence excited state dynamics in both neat and blend thin films. In addition, transient absorption spectroscopy was employed to further investigate charge generation and recombination processes. These observations are supported by thin film morphology changes as revealed by GIWAX measurements.