Laser-induced charge separation in organic nanofibers

Publikation: Konferencebidrag uden forlag/tidsskriftPosterForskning

Resumé

Organic semiconductors have unique properties that can be tailored via synthetic chemistry for specific applications, which combined with their low price and straight-forward processing over large areas make them interesting materials for future devices. Certain oligomers can self-assemble into crystalline nanofibers by vapor deposition onto muscovite mica substrates, and we have recently shown that such nanofibers can be transferred to different substrates by roll-printing and used as the active material in e.g. organic field-effect transistors (OFETs), organic light-emitting transistors (OLETs), and organic phototransistors (OPTs). However, several device-related issues incl. charge-separation and local band structure remain poorly understood. In this work, we use electrostatic force microscopy (EFM) combined with optical microscopy to study the local surface charge of an individual organic nanofiber upon illumination with a focused laser beam. Under local illumination electron-hole pairs are generated resulting in positive charge accumulation along the entire nanofiber due to the redistribution of the holes, while the electrons presumably migrate into the substrate. This is in agreement with the transport characteristics that show these nanofibers form p-type FET devices. Our current efforts are focused on nanofiber-based transistor devices using scanning photocurrent imaging (SPI) to study the local electronic band structure along the channel and at the contacts.
OriginalsprogEngelsk
Publikationsdato2014
StatusUdgivet - 2014
BegivenhedEMRS Spring Meeting 2014 - Lille, Frankrig
Varighed: 26. maj 201430. maj 2014

Konference

KonferenceEMRS Spring Meeting 2014
LandFrankrig
ByLille
Periode26/05/201430/05/2014

Fingeraftryk

polarization (charge separation)
transistors
field effect transistors
illumination
microscopy
lasers
phototransistors
muscovite
organic semiconductors
mica
oligomers
printing
scanners
photocurrents
vapor deposition
laser beams
chemistry
electrostatics
electronics
electrons

Bibliografisk note

DD.P3 19

Citer dette

Tavares, L., Behn, D., Kjelstrup-Hansen, J., & Mews, A. (2014). Laser-induced charge separation in organic nanofibers. Poster session præsenteret på EMRS Spring Meeting 2014, Lille, Frankrig.
Tavares, Luciana ; Behn, Dino ; Kjelstrup-Hansen, Jakob ; Mews, Alf. / Laser-induced charge separation in organic nanofibers. Poster session præsenteret på EMRS Spring Meeting 2014, Lille, Frankrig.
@conference{160e3ec07fed47719ce39aaffcb9ee51,
title = "Laser-induced charge separation in organic nanofibers",
abstract = "Organic semiconductors have unique properties that can be tailored via synthetic chemistry for specific applications, which combined with their low price and straight-forward processing over large areas make them interesting materials for future devices. Certain oligomers can self-assemble into crystalline nanofibers by vapor deposition onto muscovite mica substrates, and we have recently shown that such nanofibers can be transferred to different substrates by roll-printing and used as the active material in e.g. organic field-effect transistors (OFETs), organic light-emitting transistors (OLETs), and organic phototransistors (OPTs). However, several device-related issues incl. charge-separation and local band structure remain poorly understood. In this work, we use electrostatic force microscopy (EFM) combined with optical microscopy to study the local surface charge of an individual organic nanofiber upon illumination with a focused laser beam. Under local illumination electron-hole pairs are generated resulting in positive charge accumulation along the entire nanofiber due to the redistribution of the holes, while the electrons presumably migrate into the substrate. This is in agreement with the transport characteristics that show these nanofibers form p-type FET devices. Our current efforts are focused on nanofiber-based transistor devices using scanning photocurrent imaging (SPI) to study the local electronic band structure along the channel and at the contacts.",
author = "Luciana Tavares and Dino Behn and Jakob Kjelstrup-Hansen and Alf Mews",
note = "DD.P3 19; EMRS Spring Meeting 2014 ; Conference date: 26-05-2014 Through 30-05-2014",
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language = "English",

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Tavares, L, Behn, D, Kjelstrup-Hansen, J & Mews, A 2014, 'Laser-induced charge separation in organic nanofibers', EMRS Spring Meeting 2014, Lille, Frankrig, 26/05/2014 - 30/05/2014.

Laser-induced charge separation in organic nanofibers. / Tavares, Luciana ; Behn, Dino; Kjelstrup-Hansen, Jakob; Mews, Alf.

2014. Poster session præsenteret på EMRS Spring Meeting 2014, Lille, Frankrig.

Publikation: Konferencebidrag uden forlag/tidsskriftPosterForskning

TY - CONF

T1 - Laser-induced charge separation in organic nanofibers

AU - Tavares, Luciana

AU - Behn, Dino

AU - Kjelstrup-Hansen, Jakob

AU - Mews, Alf

N1 - DD.P3 19

PY - 2014

Y1 - 2014

N2 - Organic semiconductors have unique properties that can be tailored via synthetic chemistry for specific applications, which combined with their low price and straight-forward processing over large areas make them interesting materials for future devices. Certain oligomers can self-assemble into crystalline nanofibers by vapor deposition onto muscovite mica substrates, and we have recently shown that such nanofibers can be transferred to different substrates by roll-printing and used as the active material in e.g. organic field-effect transistors (OFETs), organic light-emitting transistors (OLETs), and organic phototransistors (OPTs). However, several device-related issues incl. charge-separation and local band structure remain poorly understood. In this work, we use electrostatic force microscopy (EFM) combined with optical microscopy to study the local surface charge of an individual organic nanofiber upon illumination with a focused laser beam. Under local illumination electron-hole pairs are generated resulting in positive charge accumulation along the entire nanofiber due to the redistribution of the holes, while the electrons presumably migrate into the substrate. This is in agreement with the transport characteristics that show these nanofibers form p-type FET devices. Our current efforts are focused on nanofiber-based transistor devices using scanning photocurrent imaging (SPI) to study the local electronic band structure along the channel and at the contacts.

AB - Organic semiconductors have unique properties that can be tailored via synthetic chemistry for specific applications, which combined with their low price and straight-forward processing over large areas make them interesting materials for future devices. Certain oligomers can self-assemble into crystalline nanofibers by vapor deposition onto muscovite mica substrates, and we have recently shown that such nanofibers can be transferred to different substrates by roll-printing and used as the active material in e.g. organic field-effect transistors (OFETs), organic light-emitting transistors (OLETs), and organic phototransistors (OPTs). However, several device-related issues incl. charge-separation and local band structure remain poorly understood. In this work, we use electrostatic force microscopy (EFM) combined with optical microscopy to study the local surface charge of an individual organic nanofiber upon illumination with a focused laser beam. Under local illumination electron-hole pairs are generated resulting in positive charge accumulation along the entire nanofiber due to the redistribution of the holes, while the electrons presumably migrate into the substrate. This is in agreement with the transport characteristics that show these nanofibers form p-type FET devices. Our current efforts are focused on nanofiber-based transistor devices using scanning photocurrent imaging (SPI) to study the local electronic band structure along the channel and at the contacts.

M3 - Poster

ER -

Tavares L, Behn D, Kjelstrup-Hansen J, Mews A. Laser-induced charge separation in organic nanofibers. 2014. Poster session præsenteret på EMRS Spring Meeting 2014, Lille, Frankrig.