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Colóquios 2015

Evento 

Título:
Organic transistors for light emission and detection, Jakob Kjelstrup-Hansen
Quando:
05.05.2015 16.00 h
Onde:
Anfiteatro Antônio Cabral - Porto Alegre
Categoria:
Colóquios 2015

Descrição

 

Organic transistors for light emission and detection

Jakob Kjelstrup-Hansen

NanoSYD, Mads Clausen Institute, University of Southern Denmark
Alsion 2, DK-6400 Sønderborg, Denmark, E-mail: jkh@mci.sdu.dk

 

For optoelectronic applications, organic semiconductors have several advantages over their inorganic counterparts such as facile synthesis, tunability via synthetic chemistry, and low temperature processing. Certain phenylene- and thiophene-based oligomers have the ability to self-assemble upon vacuum deposition into elongated crystalline nanostructures or ‘nanofibers’ with a range of special characteristics including polarized photo- and electroluminescence, photonic and plasmonic waveguiding, and emission color tunability. By integrating such nanofibers on a transitor platform, they can form ultra-small optoelectronic components such as light-emitters or light-detectors.

In this talk, I will present some of our recent work on organic transistors based both on thin films and nanofibers. By a recently developed roll-printing technique, the nanofibers can be transferred from their growth substrate to a device substrate for direct electrical integration. The nanofibers form a p-type transistor device and appropriate electrical biasing can stimulate highly localized, polarized light-emission. Sequential roll-printing of two different types of nanofibers can be used to realize multicolor light-emission. Additionally, the nanofiber devices can function as organic phototransistors with improved sensitivity characteristics compared to similar thin-film devices with inferior molecules ordering.

References

L. Tavares, J. Kjelstrup-Hansen and H.-G. Rubahn, “Efficient Roll-on Transfer Technique for Well-Aligned Organic Nanofibers” Small 7 (2011) 2460
X. Liu, J. Kjelstrup-Hansen, H. Boudinov, and H.-G. Rubahn, ”Charge-carrier injection assisted by space-charge field in AC-driven organic light-emitting transistors”, Organic Electronics 12 (2011) 1724
L. Tavares, J. Kjelstrup-Hansen and H.-G. Rubahn, “Localized and guided electroluminescence from printed organic nanofibres” Nanotechnology 23 (2012) 425203
P. B. W. Jensen, J. Kjelstrup-Hansen and H.-G. Rubahn, “Multicolor Nanofiber Based Organic Light-Emitting Transistors”, 14 (2013) 3324
X. Liu, A. Osadnik, J. Kjelstrup-Hansen, J. Lausen, L. Tavares, J. Kongsted, A. Lützen, and H.-G. Rubahn, ”Low-voltage organic phototransistors based on naphthyl end-capped oligothiophene nanofibers”, Organic Electronics 15 (2014) 1273

Local

Venue:
Anfiteatro Antônio Cabral
Cidade:
Porto Alegre
Estado:
Rio Grande do Sul
País:
País: br

Descrição

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Terça, Dezembro 07, 2021