Polydiacetylenes Revisited


GGPF Jan 2007 Dinner Lecture
       Tuesday, Jan. 16  
       Michael's Restaurant at Shoreline Park, Mountain View

"Polydiacetylenes Revisited:  Field-effect Transistors Based on Monolayer Films of Conjugated Polymer"
       J. Campbell Scott
        IBM Almaden Research Center

Michael's Restaurant at Shoreline Park, Mountain View


Polydiacetylenes (PDAs) were among the first conjugated polymers to be synthesized, and their remarkable properties have been extensively studied since the 1960s.  Many of the monomers crystallize in 3D structures or in 2D Langmuir films, and undergo topotactic polymerization on UV exposure. The resulting semiconducting polymers exhibit, variously, photoconductivity, non-linear optical response, thermochromism, photochromism and/or solvatochromism. In spite of this extensive research, there is still incomplete understanding of the charge transport properties, and of the structural differences that lead to the various colored phases.

Motivated by early reports of very high charge mobility in some PDA derivatives, and by the desire to examine the possibility of monolayer field-effect transistors (FETs), we have studied several derivatives and refined the processing conditions needed to obtain a PDA monolayer of essentially one phase on a solid substrate. By pre-patterning an oxidized silicon substrate with source and drain electrodes, a structure suitable to evaluate FET gating was fabricated. A voltage applied to the silicon substrate increases the conductance between source and drain, demonstrating for the first time that a highly ordered monolayer of conjugated polymer can act as the channel of an FET.

(This work was performed in collaboration with Robert Miller, JD Jeyaprakash Samuel, Charles Rettner, Sally Swanson, Jennifer Hou, Katsuhiko Fujita, Chantel Tester, and Clara Cho) 

        Speaker Background:

J. Campbell Scott received his BSc in physics from St. Andrews University in Scotland and his PhD from the University of Pennsylvania.  He was an Assistant Professor of Physics at Cornell University before joining the IBM San Jose Research Laboratory (now the Almaden Research Center) as a Research Staff Member. He has been manager of R&D groups in electrophotographic materials, display materials and processes, organic electronics and molecular electronics.  He has published more than 160 articles and holds 16 patents. Dr. Scott is a Fellow of the American Physical Society and a member of the Materials Research Society.



DATE:        Tuesday, Jan. 16

Location:        Michael's Restaurant at Shoreline Park, Mountain View
               See directions below.

Timing:   6 PM  social hour
               7 PM  dinner
               8 PM  lecture

Cost:              $30 with advance registration
                    Half price for students, retired, and unemployed.
                    Free if you attend just the lecture at 8PM.
                             (but please let us know for headcount)
                    $35 after registration deadline, if possible.  

DIRECTIONS to Michael's at Shoreline Park:

Restaurant's web page directions

From 101 in Mountain View, take the Shoreline Boulevard
Exit toward the Bay. Drive past the Shoreline Amphitheater
and go straight ahead on Shorelline, entering into Shoreline Park.  
After a mile or so inside the park, a sign for Michael's will
direct you to turn left into the parking lot for Michael's

Address: 2960 N Shoreline Blvd.
Restaurant phone: 650-962-1014
Do NOT call restaurant for reservations.

PLEASE NOTE:  we accept cash or checks, but are unable to accept payment by credit card at this time.   You may pay at the door.

Deadline for registration:    5 pm Friday Jan. 12

Please register on the web site
see detailed registration instructions below

Or, contact:  
       Syed Askari

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