1 research outputs found
Fingerprint of Charge Redistribution in the Optical Spectra of Hybrid Inorganic/Organic Semiconductor Interfaces
Hybrid structures
combining conjugated organic molecules and inorganic
semiconductors hold the promise to merge the better of two worlds.
To achieve optoelectronic functionality exceeding that of the individual
constituent, both the electronic and the optical properties of the
hybrid interface must meet certain requirements. Charge redistribution
occurring upon deposition of conjugated organic molecules on semiconductor
surfaces modulates the electrostatic potential at the hybrid interface.
Here we show at the example of ZnO-based hybrid systems that even
minuscule charge redistribution is accompanied by a profound modification
of the excitonic absorption of the semiconductor. The changes in the
optical spectra are detected in real time by differential reflectance
spectroscopy (DRS) during the deposition of the molecules. Appropriate
modeling of the spectra yields the magnitude of the change of the
electrostatic potential. Our findings provide insight into the subtle
interplay between optical and electronic properties at hybrid interfaces
which is essential to design structures with truly superior function