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

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

Nat Commun

Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon Tong, Hong Kong SAR, P. R. China.

Published: November 2019

AI Article Synopsis

Article 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 found to be caused by the overlooked optical interference and electrorefraction effect. A generalized electromodulation model is proposed to incorporate the two effects, and the extracted Δp and Δu have excellent consistency in both reflection and transmission modes in all organic film thicknesses.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6841700PMC
http://dx.doi.org/10.1038/s41467-019-13081-wDOI Listing

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