Upcoming Events

In-situ Photo-crystallography Discovers Optoelectronic Applications

April 16, 2013 11:00AM to 12:00PM
Presenter 
Jacqueline Cole, Cavendish Laboratory, University of Cambridge
Location 
Building 223, Room S105
Type 
Seminar
Series 
Materials Science Seminar
Abstract:
Photo-crystallography is a developing materials characterisation technique [1] that is enabling the interaction of light with matter to be probed at the molecular level, in a quantitative fashion. This talk will begin by introducing the technique and its scope of application. A case study will then be presented that concerns the solid-state SO2 linkage photo-isomerism in a family of ruthenium-based complexes: [Ru(SO2)(NH3)4X]Y, (X = trans-ligand; Y = counterion). T

The prospective application of this family of materials to three areas of optoelectronics is described:

  • (a) optical data storage [2];
  • (b) solar-powered molecular transduction [3];
  • (c) dyes for dyesensitized solar cells.

Time-resolved in situ photo-crystallography is also presented via a study the decay kinetics and thermal stability of this SO2 photoisomerisation . Within this scope, a material design protocol is demonstrated that enables one to control their photo-conversion levels. The discovery of these materials as molecular motors is also unravelled via this work. The talk concludes with an outlook on the application of photo-crystallography and complementary techniques to other types of optoelectronic materials, especially photo-induced structural changes that occur at much shorter time-scales (down to picoseconds); to this end, dye-sensitized solar cell applications are a primary focus. Therein, the application of (optical)pump-(X-ray)probe picosecond time-resolved experiments at synchotrons, such as the Advanced Photon Source, is introduced.

References:
[1] J. M. Cole, Chem. Soc. Rev. 2004, 33, 501-513; J. M. Cole, Analyst, 2011, 136, 448-455; J. M. Cole, Acta Crystallogr. A 2008, 64, 259-271; J. M. Cole, Zeit. Krist. 2008, 223, 363-369.
[2] Cole et al, J. Am. Chem. Soc. 134, (2012) 11860–11863 ; Cole et al, Phys. Rev. B 82 2010 155118 ; Cole et al, Chem. Commun. 2006, 2448-2450.
[3] Cole et al, Advanced Materials, 2013 (just published on-line at: http://dx.doi.org/10.1002/adma.201300478 ).