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)
Applied Physics Letters, 2022, Volume 121, Issue 18, doi.org 10.1063/5.0105893
- Date: November 2022
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.