Issue 20, 2023

Proton density monitoring at the interface of proton-donor and proton-acceptor regions in a protonic p–n junction with bias voltage

Abstract

The innovative method applied leads to direct insight into the protonic p–n junction, including changes in proton density with bias voltage. The concentration of protons in the p–n junction area increases with forward polarization (positive at the proton-donor doped site) and decreases with the blocking polarization (in the reverse direction). Due to the dependence of electrical conductivity and spin density from proton concentration (affecting the protonation degree of polyaniline molecules), polyaniline in the emeraldine base form (PANI EB) is an effective proton-sensitive spin probe, which has been used in studying the protonic p–n junction with L-band EPR. The results are the first direct evidence of the key role of protons in the protonic p–n junction.

Graphical abstract: Proton density monitoring at the interface of proton-donor and proton-acceptor regions in a protonic p–n junction with bias voltage

Article information

Article type
Communication
Submitted
11 May 2023
Accepted
17 Sep 2023
First published
18 Sep 2023
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2023,4, 4712-4717

Proton density monitoring at the interface of proton-donor and proton-acceptor regions in a protonic p–n junction with bias voltage

J. J. Langer, M. Baranowski, M. Kujawa and S. Golczak, Mater. Adv., 2023, 4, 4712 DOI: 10.1039/D3MA00229B

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