Universität zu Köln

Brohmann, Maximilian, Wieland, Sonja, Angstenberger, Simon, Herrmann, Niklas J., Luettgens, Jan, Fazzi, Daniele ORCID: 0000-0002-8515-4214 and Zaumseil, Jana ORCID: 0000-0002-2048-217X (2020). Guiding Charge Transport in Semiconducting Carbon Nanotube Networks by Local Optical Switching. ACS Appl. Mater. Interfaces, 12 (25). S. 28392 - 28404. WASHINGTON: AMER CHEMICAL SOC. ISSN 1944-8252

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Abstract

Photoswitchable, ambipolar field-effect transistors (FETs) are fabricated with dense networks of polymer-sorted, semiconducting single-walled carbon nanotubes (SWCNTs) in top-gate geometry with photochromic molecules mixed in the polymer matrix of the gate dielectric. Both hole and electron transport are strongly affected by the presence of spiropyran and its photoisomer merocyanine. A strong and persistent reduction of charge carrier mobilities and thus drain currents upon UV illumination (photoisomerization) and its recovery by annealing give these SWCNT transistors the basic properties of optical memory devices. Temperature-dependent mobility measurements and density functional theory calculations indicate scattering of charge carriers by the large dipoles of the merocyanine molecules and electron trapping by protonated merocyanine as the underlying mechanism. The direct dependence of carrier mobility on UV exposure is employed to pattern high- and low-resistance areas within the FET channel and thus to guide charge transport through the nanotube network along predefined paths with micrometer resolution. Near-infrared electroluminescence imaging enables the direct visualization of such patterned current pathways with good contrast. Elaborate mobility and thus current density patterns can be created by local optical switching, visualized and erased again by reverse isomerization through heating.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brohmann, Maximilian UNSPECIFIED UNSPECIFIED UNSPECIFIED Wieland, Sonja UNSPECIFIED UNSPECIFIED UNSPECIFIED Angstenberger, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Herrmann, Niklas J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luettgens, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED Fazzi, Daniele UNSPECIFIED orcid.org/0000-0002-8515-4214 UNSPECIFIED Zaumseil, Jana UNSPECIFIED orcid.org/0000-0002-2048-217X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329210
DOI:	10.1021/acsami.0c05640
Journal or Publication Title:	ACS Appl. Mater. Interfaces
Volume:	12
Number:	25
Page Range:	S. 28392 - 28404
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1944-8252
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-MOBILITY; TRANSISTORS; AMBIPOLAR; ELECTROLUMINESCENCE; TRANSITION Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32921