2022
DOI: 10.1021/acsaem.2c02919
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Influence of the Side Chain Structure on the Electronic Structure and Self-Organization Properties of Low Band Gap Polymers

Abstract: The properties of low band gap polymers in devices such as solar cells are strongly influenced by their morphology and ability of self-organization in thin films and interface properties. We study the influence of alkyl and alkoxy side chain position for four conjugated, alternating oligothiophene-benzothiadiazole copolymers on the molecular orientation in thin films and electronic interface properties using photoemission, X-ray absorption spectroscopy (XAS) at the sulfur K edge, and polarization modulation-in… Show more

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Cited by 3 publications
(9 citation statements)
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“…Infrared spectroscopy in reflection, and in particular PM-IRRAS, is meanwhile well-established for the determination of the molecular orientation, especially for ultrathin films ranging from monolayer coverages to 50–100 nm (e.g., Refs. [ 20 , 29 , 30 , 31 , 32 , 33 ]). For thicker films, the film thickness has to be considered for a quantitative evaluation of the data [ 34 ].…”
Section: Resultsmentioning
confidence: 99%
“…Infrared spectroscopy in reflection, and in particular PM-IRRAS, is meanwhile well-established for the determination of the molecular orientation, especially for ultrathin films ranging from monolayer coverages to 50–100 nm (e.g., Refs. [ 20 , 29 , 30 , 31 , 32 , 33 ]). For thicker films, the film thickness has to be considered for a quantitative evaluation of the data [ 34 ].…”
Section: Resultsmentioning
confidence: 99%
“…Figure 1), and for the corresponding results for the other polymers, we refer to Ref. [31]. For the investigation into the electronic (interface) properties of a few nm thick films, two substrates with different work functions were chosen (PEI Φ = 3.3 eV and gold Φ = 5.2 ± 0.1 eV).…”
Section: Electronic Structure and Molecular Orientationmentioning
confidence: 99%
“…[32] and Ref. [31] for polymers 1 and 2). Most importantly, the structural variations in the three polymers have only a small effect on the investigated electronic (interface) properties.…”
Section: Electronic Structure and Molecular Orientationmentioning
confidence: 99%
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