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UID:20250930T035731EDT-3524x40fCw@132.216.98.100
DTSTAMP:20250930T075731Z
DESCRIPTION:Solution processed organic electronic devices\, such as light e
 mitting diodes (OLEDs) and organic photovoltaics (OPVs) have attracted a g
 reat deal of attention over the past decade and while great advances have 
 been reported there are still some challenges that need to be overcome. Fo
 r example\, when fabricating more complex organic electronic devices with 
 multiple thin layers\, a great deal of care is required not to wash away t
 he first layer with the addition of a second. We explored the use of nitro
 xide mediated polymerization (NMP) to facilitate 1) cross linking\, 2) gra
 fting-to and 3) grafting-from as possible techniques for the formation of 
 robust interfacial hole transport layers between the electrode and the sub
 sequent solution processed layer.1 In all three cases these films proved t
 o be robust and resistant to solvent washes while in comparison simple spi
 n-coated films easily dissolved and wash away. These more robust films wer
 e also found to be electrochemically stable even after several washes\, fu
 rther justifying their use in the development of multi-layer organic elect
 ronic devices. These studies illustrate three robust routes for the fabric
 ation of multilayered solution processed organic electronic devices. \n\nS
 ilicon phthalocyanine (SiPc) have two axial bonds originating from the Si 
 atom which can serve as functionalization sites without affecting the inhe
 rent optoelectronic properties of the SiPc macrocycle itself. We have used
  these handles to engineer an enhanced solid state arrangement of the resu
 lting SiPcs and incorporate them into planar heterojunction OPVs as either
  the donor or the acceptor molecules. The devices experienced as much as a
  400% increase in efficiency when using these engineered SiPcs compared to
  the initial dichloro-SiPc.2\,3 Additionally\, these handles have also bee
 n used to synthesize solution processable ternary additives for P3HT:PC61B
 M bulk heterojunction OPVs with increased photo generation at the interfac
 e which translates to a 20% increase in overall efficiency.4 Recently we h
 ave reported the use of a multifunctional SiPc ternary additive that not o
 nly increase the efficiency of the OPV but also increases the stability by
  migrating to the interface and crosslinking the P3HT and PC61BM domains.5
  These studies are showing potential for SiPcs in OPVs and the axial funct
 ionalization to enhanced device performance.\n\n \n\n(1)           Melvill
 e\, O. A.\; King\, B.\; Imperiale\, C. J.\; Lessard\, B. H. Langmuir 2016\
 , 32\, 13640–13648.\n\n(2)           Lessard\, B. H.\; Grant\, T. M.\; Whi
 te\, R.\; Thibau\, E.\; Lu\, Z.-H.\; Bender\, T. P. J. Mater. Chem. A 2015
 \, 3\, 24512–24524.\n\n(3)           Lessard\, B. H.\; et al. ACS Appl. Ma
 ter. Interfaces 2015\, 7 (9)\, 5076–5088.\n\n(4)           Lessard\, B. H.
 \; et al. ACS Appl. Mater. Interfaces 2014\, 6\, 15040–15051.\n\n(5)      
      Grant\, T. M.\; Gorisse\, T.\; Dautel\, O. J.\; Wantz\, G.\; Lessard\
 , B. H. J. Mater. Chem. A 2017\, ASAP.\n
DTSTART:20170207T180000Z
DTEND:20170207T191500Z
LOCATION:Room 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\
 , 801 rue Sherbrooke Ouest
SUMMARY:CSACS Student Seminar: Dr. Benoît H. Lessard - Performance Improvem
 ent of organic electronic devices through Interface Engineering: from surf
 ace initiated polymerization off the electrodes to crosslinking silicon ph
 thalocyanine additives
URL:/chemistry/channels/event/csacs-student-seminar-dr
 -benoit-h-lessard-performance-improvement-organic-electronic-devices-throu
 gh-264739
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