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SUMMARY:Taming Complexity in Dynamic Multicomponent Materials: Tailoring L
 ow Dimensional Multifunctional Nanostructures - Professor Paolo Samori\, U
 niversity of Strasbourg
DTSTART:20160126T100000Z
DTEND:20160126T110000Z
UID:TALK63272@talks.cam.ac.uk
CONTACT:Stuart Higgins
DESCRIPTION:PLEASE NOTE TIME AND VENUE CHANGE.\n\nOrganic optoelectronic m
 aterials attract particular attention for the development of low-cost mult
 ifunctional devices\, such as photo-transistors and optical memories. In t
 hese devices\, light is used as a remote control to modulate electrical pr
 operties. In particular\, conductivity can be tuned by incorporating photo
 chromic molecules\, which are able to undergo a reversible light-induced i
 nterconversion between two (or more) isomers possessing markedly different
  physical and chemical properties\, such as different ionization potential
 s. [1]\n\nIn this lecture I will present different recent approaches we ha
 ve 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 semicondu
 ctor can be decorated by covalent tethering of photochromic molecules. Alt
 ernatively 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 a
 nd bistable energy levels\, was also used to fabricate memories on flexibl
 e substrates.\n\nOur findings are of interest for the development of high-
 performing optically gated electronic devices\, towards printable logic ci
 rcuits.\n\n\n[1] E. Orgiu\, P. Samorì\, "Organic Electronics marries Phot
 ochromism: Generation of Multifunctional Interfaces\, Materials and Device
 s"\, Adv. Mater. 2014\, 26\, 1827-1845.\n[2] N. Crivillers\, E. Orgiu\, F.
  Reinders\, M. Mayor\, P. Samorì\, "Optical modulation of the charge inje
 ction in an organic field-effect transistor based on photochromic SAM func
 tionalized electrodes" Adv. Mater. 2011\, 23\, 1447-1452.\n[3] C. Raimondo
 \, N. Crivillers\, F. Reinders\, F. Sander\, M. Mayor\, P. Samorì\, "Enha
 nced current photo-switching in a field-effect transistor based on photore
 sponsive gold nanoparticles blended with poly(3-hexylthiophene)"\, Proc. N
 atl. Acad. Sci. U.S.A. 2012\, 109\, 12375-12380.\n[4] M. El Gemayel\, K. B
 örjesson\, M. Herder\, D.T. Duong\, J.A. Hutchison\, C. Ruzié\, G. Schwe
 icher\, A. Salleo\, Y. Geerts\, S. Hecht\, E. Orgiu\, P. Samorì\, "Optica
 lly switchable transistors by simple incorporation of photochromic systems
  into small molecule semiconducting matrices" Nature Commun.\, 2015\, 6\, 
 6330.\n[5] E. Orgiu\, N. Crivillers\, M. Herder\, L. Grubert\, M. Pätzel\
 , J. Frisch\, E. Pavlica\, G. Bratina\, N. Koch\, S. Hecht\, and P. Samor
 ì\, "Optically switchable transistor via energy level phototuning in a bi
 -component organic semiconductor"\, Nat. Chem. 2012\, 4\, 675-679.\n[6] K.
  Börjesson\, M. Herder\, L. Grubert\, D. T. Duong\, A. Salleo\, S. Hecht\
 , E. Orgiu\, P. Samorì\, "Optically Switchable Transistors Comprising a H
 ybrid Photochromic Molecule / n-type Organic Active Layer" J. Mater. Chem.
  C 2015\, 3\, 4156–4161
LOCATION:Rutherford Seminar Room B\, Cavendish Laboratory\, Department of 
 Physics
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