Enhanced photoresponsivity in organic field effect transistors by silver nanoparticles

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Organic semiconductors (OSC) such as thiophene-based oligomers exhibit useful electronic and optical properties making them applicable in photo-sensing devices. Generally, thiophene-based photodetectors exhibit a decent responsivity with a spectral sensitivity determined by the OSC's absorption properties. We present a simple, yet efficient method to enhance and spectrally tune the photoresponsivity of organic phototransistors (OPTs) utilizing the plasmonic properties of embedded metallic nanoparticles. The ability to fabricate and characterize nanostructures with high accuracy allows for tailoring of the optical properties of metal nanoparticles (NPs) and thereby tuning of the spectral range of enhanced photoresponsivity. In this work we have investigated OPTs based on the molecule 5,5″-bis(naphth-2-yl)-2,2':5′,2″-terthiophene (NaT3). We have fabricated OPTs with electron beam lithography-defined arrays of silver NPs under the organic thin-film. The photoconductivity of OPTs with and without NPs was characterized under spectrally resolved illumination. The OPTs exhibit significant responsivity at wavelengths below 500nm essentially coinciding with the absorption spectrum of NaT3. Finite element simulations of the optical properties of the NPs reveal large electric field enhancement at the plasmon resonances. At these wavelengths (350→500nm) the experimentally measured photoresponsivity of OPTs with NPs is significantly increased compared to the responsivity for OPTs without NPs. Due to a variation in particle size and shape of the fabricated silver NPs, a spectrally broad enhancement is predicted, which is in agreement with the experimental results. The results show that the photoresponsivity is dominantly enhanced in a spectral region of low OSC absorption coinciding with the localized surface plasmon resonances of the NPs. This work demonstrates that it is possible to improve and tailor the responsivity spectrum of photoactive organic devices by integration of metal nanoparticles.
Original languageEnglish
JournalOrganic Electronics
Volume46
Pages (from-to)270-275
ISSN1566-1199
DOIs
Publication statusPublished - 2017

Fingerprint

Organic field effect transistors
Phototransistors
Silver
phototransistors
field effect transistors
silver
Nanoparticles
nanoparticles
Thiophenes
Semiconducting organic compounds
Optical properties
Metal nanoparticles
Thiophene
organic semiconductors
thiophenes
optical properties
Wavelength
Electron beam lithography
Photoconductivity
Surface plasmon resonance

Cite this

@article{47e8de7aadb74ff483a1480dda663f05,
title = "Enhanced photoresponsivity in organic field effect transistors by silver nanoparticles",
abstract = "Organic semiconductors (OSC) such as thiophene-based oligomers exhibit useful electronic and optical properties making them applicable in photo-sensing devices. Generally, thiophene-based photodetectors exhibit a decent responsivity with a spectral sensitivity determined by the OSC's absorption properties. We present a simple, yet efficient method to enhance and spectrally tune the photoresponsivity of organic phototransistors (OPTs) utilizing the plasmonic properties of embedded metallic nanoparticles. The ability to fabricate and characterize nanostructures with high accuracy allows for tailoring of the optical properties of metal nanoparticles (NPs) and thereby tuning of the spectral range of enhanced photoresponsivity. In this work we have investigated OPTs based on the molecule 5,5″-bis(naphth-2-yl)-2,2':5′,2″-terthiophene (NaT3). We have fabricated OPTs with electron beam lithography-defined arrays of silver NPs under the organic thin-film. The photoconductivity of OPTs with and without NPs was characterized under spectrally resolved illumination. The OPTs exhibit significant responsivity at wavelengths below 500nm essentially coinciding with the absorption spectrum of NaT3. Finite element simulations of the optical properties of the NPs reveal large electric field enhancement at the plasmon resonances. At these wavelengths (350→500nm) the experimentally measured photoresponsivity of OPTs with NPs is significantly increased compared to the responsivity for OPTs without NPs. Due to a variation in particle size and shape of the fabricated silver NPs, a spectrally broad enhancement is predicted, which is in agreement with the experimental results. The results show that the photoresponsivity is dominantly enhanced in a spectral region of low OSC absorption coinciding with the localized surface plasmon resonances of the NPs. This work demonstrates that it is possible to improve and tailor the responsivity spectrum of photoactive organic devices by integration of metal nanoparticles.",
author = "Jes Linnet and {Runge Walther}, Anders and Ole Albrektsen and Luciana Tavares and Eriksen, {Ren{\'e} Lynge} and Jensen, {Per Baunegaard With} and Andreas Osadnik and S{\o}ren Hassing and Arne L{\"u}tzen and Jakob Kjelstrup-Hansen",
year = "2017",
doi = "10.1016/j.orgel.2017.04.019",
language = "English",
volume = "46",
pages = "270--275",
journal = "Organic Electronics",
issn = "1566-1199",
publisher = "Elsevier",

}

Enhanced photoresponsivity in organic field effect transistors by silver nanoparticles. / Linnet, Jes; Runge Walther, Anders; Albrektsen, Ole; Tavares, Luciana ; Eriksen, René Lynge; Jensen, Per Baunegaard With; Osadnik, Andreas; Hassing, Søren; Lützen, Arne; Kjelstrup-Hansen, Jakob.

In: Organic Electronics, Vol. 46, 2017, p. 270-275.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Enhanced photoresponsivity in organic field effect transistors by silver nanoparticles

AU - Linnet, Jes

AU - Runge Walther, Anders

AU - Albrektsen, Ole

AU - Tavares, Luciana

AU - Eriksen, René Lynge

AU - Jensen, Per Baunegaard With

AU - Osadnik, Andreas

AU - Hassing, Søren

AU - Lützen, Arne

AU - Kjelstrup-Hansen, Jakob

PY - 2017

Y1 - 2017

N2 - Organic semiconductors (OSC) such as thiophene-based oligomers exhibit useful electronic and optical properties making them applicable in photo-sensing devices. Generally, thiophene-based photodetectors exhibit a decent responsivity with a spectral sensitivity determined by the OSC's absorption properties. We present a simple, yet efficient method to enhance and spectrally tune the photoresponsivity of organic phototransistors (OPTs) utilizing the plasmonic properties of embedded metallic nanoparticles. The ability to fabricate and characterize nanostructures with high accuracy allows for tailoring of the optical properties of metal nanoparticles (NPs) and thereby tuning of the spectral range of enhanced photoresponsivity. In this work we have investigated OPTs based on the molecule 5,5″-bis(naphth-2-yl)-2,2':5′,2″-terthiophene (NaT3). We have fabricated OPTs with electron beam lithography-defined arrays of silver NPs under the organic thin-film. The photoconductivity of OPTs with and without NPs was characterized under spectrally resolved illumination. The OPTs exhibit significant responsivity at wavelengths below 500nm essentially coinciding with the absorption spectrum of NaT3. Finite element simulations of the optical properties of the NPs reveal large electric field enhancement at the plasmon resonances. At these wavelengths (350→500nm) the experimentally measured photoresponsivity of OPTs with NPs is significantly increased compared to the responsivity for OPTs without NPs. Due to a variation in particle size and shape of the fabricated silver NPs, a spectrally broad enhancement is predicted, which is in agreement with the experimental results. The results show that the photoresponsivity is dominantly enhanced in a spectral region of low OSC absorption coinciding with the localized surface plasmon resonances of the NPs. This work demonstrates that it is possible to improve and tailor the responsivity spectrum of photoactive organic devices by integration of metal nanoparticles.

AB - Organic semiconductors (OSC) such as thiophene-based oligomers exhibit useful electronic and optical properties making them applicable in photo-sensing devices. Generally, thiophene-based photodetectors exhibit a decent responsivity with a spectral sensitivity determined by the OSC's absorption properties. We present a simple, yet efficient method to enhance and spectrally tune the photoresponsivity of organic phototransistors (OPTs) utilizing the plasmonic properties of embedded metallic nanoparticles. The ability to fabricate and characterize nanostructures with high accuracy allows for tailoring of the optical properties of metal nanoparticles (NPs) and thereby tuning of the spectral range of enhanced photoresponsivity. In this work we have investigated OPTs based on the molecule 5,5″-bis(naphth-2-yl)-2,2':5′,2″-terthiophene (NaT3). We have fabricated OPTs with electron beam lithography-defined arrays of silver NPs under the organic thin-film. The photoconductivity of OPTs with and without NPs was characterized under spectrally resolved illumination. The OPTs exhibit significant responsivity at wavelengths below 500nm essentially coinciding with the absorption spectrum of NaT3. Finite element simulations of the optical properties of the NPs reveal large electric field enhancement at the plasmon resonances. At these wavelengths (350→500nm) the experimentally measured photoresponsivity of OPTs with NPs is significantly increased compared to the responsivity for OPTs without NPs. Due to a variation in particle size and shape of the fabricated silver NPs, a spectrally broad enhancement is predicted, which is in agreement with the experimental results. The results show that the photoresponsivity is dominantly enhanced in a spectral region of low OSC absorption coinciding with the localized surface plasmon resonances of the NPs. This work demonstrates that it is possible to improve and tailor the responsivity spectrum of photoactive organic devices by integration of metal nanoparticles.

U2 - 10.1016/j.orgel.2017.04.019

DO - 10.1016/j.orgel.2017.04.019

M3 - Journal article

VL - 46

SP - 270

EP - 275

JO - Organic Electronics

JF - Organic Electronics

SN - 1566-1199

ER -