Transient 2D IR Spectroscopy of Charge Injection in Dye-Sensitized Nanocrystalline Thin Films

摘要

Charge injection is one of the critical steps in the conversion of solar to electrical energy in dye-sensitized nanocrystalline thin films. Ultrafast infrared spectroscopy has emerged as a useful tool for studying this process because the ground and oxidized forms of the dye have unique vibrational frequencies and the free electrons in the semiconductor exhibit a broad electronic absorption that extends into the mid-infrared. The free electron absorption is particularly useful because it can be used to time-resolve the kinetics of electron injection.