Ground-state electron transfer in all-polymer donor-acceptor heterojunctions
Journal article, 2020

Doping of organic semiconductors is crucial for the operation of organic (opto)electronic and electrochemical devices. Typically, this is achieved by adding heterogeneous dopant molecules to the polymer bulk, often resulting in poor stability and performance due to dopant sublimation or aggregation. In small-molecule donor–acceptor systems, charge transfer can yield high and stable electrical conductivities, an approach not yet explored in all-conjugated polymer systems. Here, we report ground-state electron transfer in all-polymer donor–acceptor heterojunctions. Combining low-ionization-energy polymers with high-electron-affinity counterparts yields conducting interfaces with resistivity values five to six orders of magnitude lower than the separate single-layer polymers. The large decrease in resistivity originates from two parallel quasi-two-dimensional electron and hole distributions reaching a concentration of ∼1013 cm–2. Furthermore, we transfer the concept to three-dimensional bulk heterojunctions, displaying exceptional thermal stability due to the absence of molecular dopants. Our findings hold promise for electro-active composites of potential use in, for example, thermoelectrics and wearable electronics.

Author

Kai Xu

Linköping University

Hengda Sun

Linköping University

Tero Petri Ruoko

Linköping University

Gang Wang

Linköping University

Renee Kroon

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Nagesh B. Kolhe

University of Washington

Yuttapoom Puttisong

Linköping University

X. J. Liu

Linköping University

D. Fazzi

University of Cologne

Koki Shibata

Chiba University

Chi Yuan Yang

Linköping University

Ning Sun

Yunnan University

Gustav Persson

Nano and Biophysics

Andrew Yankovich

Nano and Biophysics

Eva Olsson

Nano and Biophysics

Hiroyuki Yoshida

Chiba University

W.M. Chen

Linköping University

M. Fahlman

Linköping University

M. Kemerink

Linköping University

Samson A. Jenekhe

University of Washington

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

M. Berggren

Linköping University

S. Fabiano

Linköping University

Nature Materials

1476-1122 (ISSN) 1476-4660 (eISSN)

Vol. In Press

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1038/s41563-020-0618-7

More information

Latest update

6/28/2020