Charge transfer dynamics fundamentally influence energy conversion efficiency in excited electronic states, directly impacting photoelectric conversion, molecular electronics, and catalysis. The core hole clock (CHC) technique enables the precise measurement of interfacial charge transfer time, providing insights into the electronic structure and dynamics of organic and inorganic coupled systems. Among these materials, poly(3-hexylthiophene) (P3HT), a p-type semiconductor known for its high charge mobility, serves as an ideal model for charge transfer studies. This review discusses recent advancements in understanding charge transfer dynamics in P3HT-based composites through the application of the CHC technique. The studies are categorized into two main areas: (1) P3HT combined with carbon-based nanomaterials and (2) P3HT combined with 2D materials. These findings highlight the effectiveness of the CHC technique in probing interfacial charge transfer and emphasize the critical role of nanomaterial interfaces in modulating charge transfer, which is essential for advancing organic electronic devices and energy conversion systems.
