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Mapping the Density of States Distribution of Organic Semiconductors by Employing Energy Resolved–Electrochemical Impedance Spectroscopy

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005274
URN to cite this document: urn:nbn:de:bvb:703-epub-5274-8

Title data

Bässler, Heinz ; Kroh, Daniel ; Schauer, Franz ; Nádaždy, Vojtech ; Köhler, Anna:
Mapping the Density of States Distribution of Organic Semiconductors by Employing Energy Resolved–Electrochemical Impedance Spectroscopy.
In: Advanced Functional Materials. (6 December 2020) . - No. 2007738. - 8 S.
ISSN 1616-3028
DOI der Verlagsversion: https://doi.org/10.1002/adfm.202007738

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Abstract

Abstract Although the density of states (DOS) distribution of charge transporting states in an organic semiconductor is vital for device operation, its experimental assessment is not at all straightforward. In this work, the technique of energy resolved–electrochemical impedance spectroscopy (ER-EIS) is employed to determine the DOS distributions of valence (highest occupied molecular orbital (HOMO)) as well as electron (lowest unoccupied molecular orbital (LUMO)) states in several organic semiconductors in the form of neat and blended films. In all cases, the core of the inferred DOS distributions are Gaussians that sometimes carry low energy tails. A comparison of the HOMO and LUMO DOS of P3HT inferred from ER-EIS and photoemission (PE) or inverse PE (IPE) spectroscopy indicates that the PE/IPE spectra are by a factor of 2–3 broader than the ER-EIS spectra, implying that they overestimate the width of the distributions. A comparison of neat films of MeLPPP and SF-PDI2 or PC(61)BM with corresponding blends reveals an increased width of the DOS in the blends. The results demonstrate that this technique does not only allow mapping the DOS distributions over five orders of magnitude and over a wide energy window of 7 eV, but can also delineate changes that occur upon blending.

Further data

Item Type: Article in a journal
Keywords: Organic electronics; Organic solar cells; Photoemission spectroscopy; Voltammetry
DDC Subjects: 500 Science > 530 Physics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Research Institutions
Research Institutions > Research Centres
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5274-8
Date Deposited: 15 Feb 2021 10:23
Last Modified: 16 Feb 2021 06:41
URI: https://epub.uni-bayreuth.de/id/eprint/5274

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