Identification of the nature of excitons in PPDT2FBT using electroabsorption spectroscopy
作者： Rajdeep Dhar , Jayeeta Bhattacharyya , Subhamoy Sahoo , Soumya Dutta , Sanjoy Jena
DOI:
关键词: Absorption band 、 Semiconductor 、 Exciton 、 Absorption spectroscopy 、 Organic semiconductor 、 Materials science 、 Spectral line 、 Pentacene 、 Dissociation (chemistry) 、 Molecular physics
摘要: Electroabsorption (EA) measurements can be used to identify the type of excitons contributing absorption spectra semiconductors which have applications in optoelectronics. However, inferences from EA measurement greatly depend on method fitting and extraction parameters measured spectra. We deconstruct spectrum by multiple Gaussians obtain relative contribution first second derivative each band spectrum, gives indication Frenkel, charge transfer or mixed nature involved. check applicability for pentacene is widely well studied organic semiconductor. report poly[(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 feature around 3.07 eV, strongly Frenkel-like, most bands PPDT2FBT are states, having relatively high contributions. Since higher dissociation efficiencies, we infer a promising candidate photovoltaic applications.
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