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SUMMARY:Thermoelectrical properties of self-assembled molecular-scale junc
 tions enhanced by quantum interference effects - Ben Robinson\, Department
  of Physics\, University of Lancaster
DTSTART:20221205T150000Z
DTEND:20221205T160000Z
UID:TALK193585@talks.cam.ac.uk
CONTACT:Chris Ford
DESCRIPTION:Room-temperature quantum interference (QI) can be used to enha
 nce the thermal and electrical properties of arrays of organic molecules t
 o create ultra-thin-film thermoelectric materials with an unprecedented ab
 ility to convert waste heat to electricity using the Seebeck effect and to
  cool at the nanoscale via the Peltier effect. The realisation of self-ass
 embled molecular-electronic films\, whose room-temperature transport prope
 rties are controlled by QI\, is an essential step in the scale-up of QI ef
 fects from single molecules to parallel arrays of molecules. Here I will r
 eport on our recent progress such enhanced self-assembled monolayers (SAMs
 ). I will focus on experimental aspects of the work using and discuss the 
 key role that scanning probe microscopy takes in the characterisation of S
 AMs. Recently\, the effect of destructive QI (DQI) on the electrical condu
 ctance of self-assembled monolayers (SAMs) has been investigated. \nHere\,
  I will show that we have demonstrated chemical control of different forms
  of constructive QI (CQI) in cross-plane transport through SAMs and its in
 fluence on cross-plane thermoelectricity in SAMs. It is known that the ele
 ctrical conductance of single molecules can be controlled deterministicall
 y by chemically varying their connectivity to external electrodes. Here\, 
 by employing synthetic methodologies to vary the connectivity of terminal 
 anchor groups around aromatic anthracene cores\, and by forming SAMs of th
 e resulting molecules\, it can be clearly demonstrated that this signature
  of CQI can be translated into SAM-on-gold molecular films [1]. Furthermor
 e\, I will discuss the role that the chemical anchor of the SAM plays in t
 he transport properties of the film [2] and how thermoelectric power harve
 sting can be controlled by the pressure applied to molecular junctions [3]
 . Finally\, I will discuss the role of ‘slippery’ porphyrin anchors [4
 ] and multilayer films and how these offer exciting design strategies for 
 future SAMs.\n1.	Wang\, et al.\, Journal of the American Chemical Society 
 142 (19) 8555–8560 (2020)\n2.	Ismael\, et al.\, Chemical Science\, 11\, 
 6836-6841 (2020)\n3.	Wang\, et al.\, Chemical Science 12 (14)\, 5230-5235 
 (2021)\n4.	Wang\, et al.\, Journal of Physics: Energy\, 4 (2)\, 24002 (202
 2)\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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