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Electroabsorption (EA) measurements can be used to identify the type ofexcitons contributing to the absorption spectra of semiconductors which haveapplications in optoelectronics. However, the inferences from the EAmeasurement greatly depend on the method of fitting and extraction ofparameters from the measured spectra. We deconstruct the absorption spectrum byfitting multiple Gaussians and obtain the relative contribution of first andsecond derivative of each absorption band in EA spectrum, which givesindication of the Frenkel, charge transfer or mixed nature of the excitonsinvolved. We check the applicability of the method for pentacene which iswidely used and well studied organic semiconductor. We report EA measurementsofpoly[(2,5-bis(2-hexyldecyloxy)-phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c]-[1,2,5]-thiadiazole)](PPDT2FBT). Our analysis shows that besides the feature around 3.07 eV, whichis strongly Frenkel-like, most of the absorption bands for PPDT2FBT are mixedstates, having relatively high charge transfer contributions. Since chargetransfer excitons have higher dissociation efficiencies, we infer PPDT2FBT tobe a promising candidate for photovoltaic applications.

Identification of the nature of excitons in PPDT2FBT using electroabsorption spectroscopy