Field-induced modification of the electronic structure in BTBT-based organic thin films observed by NEXAFS spectroscopy
Johnson M, Hawly T, Zhao B, Halik M, Nefedov A, Fink R (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 121
Journal Issue: 18
DOI: 10.1063/5.0105893
Abstract
We present an in operando near-edge x-ray absorption fine structure (NEXAFS) study on p-type [11-(benzo[b]benzo[4,5]thieno[2,3-d]thiophen-2-yl)dodecyl)] BTBT-based self-assembled monolayer (BTBT-SAM) films. As a 2D-model system, the BTBT-SAM offers direct insight into the active organic semiconductor layer without interfering bulk materials. This allows for the observation of polaronic states caused by charged species at the dielectric/organic interface. Linear NEXAFS dichroism is employed to derive the molecular orientation of the BTBT subunit. Field-induced modifications in the unoccupied molecular orbitals are observed in the NEXAFS spectra. The spectral changes in the on- and off-states are discussed in the context of polaron formation due to charge accumulation induced by the applied electric field. Published under an exclusive license by AIP Publishing.
Authors with CRIS profile
Manuel Johnson
Lehrstuhl für Physikalische Chemie II
Tim Hawly
Professur für Physikalische Chemie
Baolin Zhao
Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)
Marcus Halik
Professur für Werkstoffwissenschaften (Polymerwerkstoffe)
Rainer Fink
Professur für Physikalische Chemie
Involved external institutions
Germany (DE)How to cite
APA:
Johnson, M., Hawly, T., Zhao, B., Halik, M., Nefedov, A., & Fink, R. (2022). Field-induced modification of the electronic structure in BTBT-based organic thin films observed by NEXAFS spectroscopy. Applied Physics Letters, 121(18). https://dx.doi.org/10.1063/5.0105893
MLA:
Johnson, Manuel, et al. "Field-induced modification of the electronic structure in BTBT-based organic thin films observed by NEXAFS spectroscopy." Applied Physics Letters 121.18 (2022).
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