Ultrafast Spectroscopic Investigation of P3HT and Derivatives in Versatile Contexts: From Organic Solar Cells, via Perovskite Photovoltaics to Biosensing

摘要

In this talk, versatile results obtained for P3HT and related polythiophenes, using ultrafast spectroscopic techniques, will be overviewed. I will start with excited-state relaxation processes taking place in P3HT thin films and solutions [1], focusing on the importance of short-lived delocalized states. I will then move on to charge generation mechanisms in polythiophene:PCBM blends (organic photovoltaic materials). Here, particular emphasis will be on the influence of the phase morphology and microstructure on the generation and recombination of charges [2]. Next, I will talk about charge transfer dynamics from methyl ammonium lead iodide perovskites to P3HT hole transporting materials [3], and discuss why this is found to be particularly slow. Finally, the photophysical properties of a water-soluble cationic polythiophene derivative, used for DNA sensing [4], will be presented as a function of assembly with different single-stranded DNA sequences.