University of Cambridge > > Optoelectronics Group > Taming Complexity in Dynamic Multicomponent Materials: Tailoring Low Dimensional Multifunctional Nanostructures

Taming Complexity in Dynamic Multicomponent Materials: Tailoring Low Dimensional Multifunctional Nanostructures

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Organic optoelectronic materials attract particular attention for the development of low-cost multifunctional devices, such as photo-transistors and optical memories. In these devices, light is used as a remote control to modulate electrical properties. In particular, conductivity can be tuned by incorporating photochromic molecules, which are able to undergo a reversible light-induced interconversion between two (or more) isomers possessing markedly different physical and chemical properties, such as different ionization potentials. [1]

In this lecture I will present different recent approaches we have undertaken in order to develop high performing, solution processable, optically switchable thin-film transistors. Planar [2] or non-planar [3] interfaces between Au (nano)structures and the organic/polymeric semiconductor can be decorated by covalent tethering of photochromic molecules. Alternatively blending of ad-hoc photochromic molecules with p-type organic [4] /polymeric [5] semiconductors or even n-type [6] semiconductors can be used. The latter method, which relies on the generation of phototunable and bistable energy levels, was also used to fabricate memories on flexible substrates.

Our findings are of interest for the development of high-performing optically gated electronic devices, towards printable logic circuits.

[1] E. Orgiu, P. Samorì, “Organic Electronics marries Photochromism: Generation of Multifunctional Interfaces, Materials and Devices”, Adv. Mater. 2014, 26, 1827-1845. [2] N. Crivillers, E. Orgiu, F. Reinders, M. Mayor, P. Samorì, “Optical modulation of the charge injection in an organic field-effect transistor based on photochromic SAM functionalized electrodes” Adv. Mater. 2011, 23, 1447-1452. [3] C. Raimondo, N. Crivillers, F. Reinders, F. Sander, M. Mayor, P. Samorì, “Enhanced current photo-switching in a field-effect transistor based on photoresponsive gold nanoparticles blended with poly(3-hexylthiophene)”, Proc. Natl. Acad. Sci. U.S.A. 2012, 109, 12375-12380. [4] M. El Gemayel, K. Börjesson, M. Herder, D.T. Duong, J.A. Hutchison, C. Ruzié, G. Schweicher, A. Salleo, Y. Geerts, S. Hecht, E. Orgiu, P. Samorì, “Optically switchable transistors by simple incorporation of photochromic systems into small molecule semiconducting matrices” Nature Commun., 2015, 6, 6330. [5] E. Orgiu, N. Crivillers, M. Herder, L. Grubert, M. Pätzel, J. Frisch, E. Pavlica, G. Bratina, N. Koch, S. Hecht, and P. Samorì, “Optically switchable transistor via energy level phototuning in a bi-component organic semiconductor”, Nat. Chem. 2012, 4, 675-679. [6] K. Börjesson, M. Herder, L. Grubert, D. T. Duong, A. Salleo, S. Hecht, E. Orgiu, P. Samorì, “Optically Switchable Transistors Comprising a Hybrid Photochromic Molecule / n-type Organic Active Layer” J. Mater. Chem. C 2015 , 3, 4156–4161

This talk is part of the Optoelectronics Group series.

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