A generalized Stark effect electromodulation model for extracting excitonic properties in organic semiconductors.

ABSTRACT: Electromodulation (EM) spectroscopy, a powerful technique to monitor the changes in polarizability p and dipole moment u of materials upon photo-excitation, can bring direct insight into the excitonic properties of materials. However, extracting Δp and Δu from the electromodulation spectrum relies on fitting with optical absorption of the materials where optical effect in different device geometries might introduce large variation in the extracted values. Here, we demonstrate a systematic electromodulation study with various fitting approaches in both commonly adopted reflection and transmission device architectures. Strikingly, we have found that the previously ascribed continuum state threshold from the deviation between the measured and fitting results is questionable. Such deviation is

SUBMITTER: Liu T 

PROVIDER: S-EPMC6841700 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature