Evidence of hybridization states at the donor/acceptor interface: case of m-MTDATA/PPT

Teng Zhang; Tingting Wang; Cesare Grazioli; Ambra Guarnaccio; Iulia Emilia Brumboiu; Fredrik O L Johansson; Klára Beranová; Marcello Coreno; Monica de Simone; Barbara Brena; Liwei Liu; Yeliang Wang; Carla Puglia

doi:10.1088/1361-648X/ac5aff

Evidence of hybridization states at the donor/acceptor interface: case of m-MTDATA/PPT

J Phys Condens Matter. 2022 Mar 23;34(21). doi: 10.1088/1361-648X/ac5aff.

Authors

Affiliations

¹ School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, 100081 Beijing, People's Republic of China.
² IOM-CNR, Laboratorio TASC, Sincrotrone Trieste, 34149 Trieste, Italy.
³ ISM-CNR, Istituto di Struttura della Materia, 85050 Tito Scalo (Pz) and 34149 Trieste (Ts), Italy.
⁴ Department of Chemistry, Pohang University of Science and Technology (POSTECH), 37673 Pohang, Republic of Korea.
⁵ Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden.
⁶ Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, 10044 Stockholm, Sweden.
⁷ Institut des Nanosciences de Paris, UMR CNRS 7588, Sorbonne Université, F-75005 Paris, France.
⁸ Elettra-Sincrotrone Trieste S. C. p. A., Strada Statale 14, km 163.5, Basovizza, 34149 Trieste, Italy.
⁹ FZU-Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic.
¹⁰ Division of Materials Theory, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden.

PMID: 35245912
DOI: 10.1088/1361-648X/ac5aff

Abstract

We performed a spectroscopic study on them-MTDATA (donor) and PPT (acceptor) molecular vertical heterostructure. The electronic properties of the donor/acceptor interface have been comprehensively characterized by synchrotron radiation-based photoelectron spectroscopy and near-edge x-ray absorption fine structure. The spectroscopic results reveal the existence of new hybridization states in the original molecular energy gap, likely attributed to the interaction between the donor and the acceptor molecules at the interface. Such hybridized states can have a significant impact on the charge transport in organic electronic devices based on donor-acceptor molecules and can explain the increased efficiency of device using such molecules.

Keywords: D–A heterojunction; NEXAFS; PES; PPT; hybridized state; interface; m-MTDATA.