36192
2012
2012
eng
5
3
108
article
American Physical Society
College Park
1
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Intermolecular hybridization governs molecular electrical doping
Current models for molecular electrical doping of organic semiconductors are found to be at odds with other well-established concepts in that field, like polaron formation. Addressing these inconsistencies for prototypical systems, we present experimental and theoretical evidence for intermolecular hybridization of organic semiconductor and dopant frontier molecular orbitals. Common doping-related observations are attributed to this phenomenon, and controlling the degree of hybridization emerges as a strategy for overcoming the present limitations in the yield of doping-induced charge carriers.
Physical review letters
10.1103/PhysRevLett.108.035502
0031-9007
wos:2011-2013
035502
WOS:000299328500016
Salzmann, I (reprint author), Humboldt Univ, Inst Phys, D-12489 Berlin, Germany., ingo.salzmann@physik.hu-berlin.de; georg.heimel@physik.hu-berlin.de
DFG (Germany); JSPS (Japan); Austrian Science Fund (FWF) [P21094]
Ingo Salzmann
Georg Heimel
Steffen Duhm
Martin Oehzelt
Patrick Pingel
Benjamin M. George
Alexander Schnegg
Klaus Lips
Ralf-Peter Blum
Antje Vollmer
Norbert Koch
Institut für Physik und Astronomie
Referiert
39424
2015
2015
eng
58
63
6
1
53
article
Wiley-Blackwell
Hoboken
1
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Charge Transfer in and Conductivity of Molecularly Doped Thiophene-Based Copolymers
The electrical conductivity of organic semiconductors can be enhanced by orders of magnitude via doping with strong molecular electron acceptors or donors. Ground-state integer charge transfer and charge-transfer complex formation between organic semiconductors and molecular dopants have been suggested as the microscopic mechanisms causing these profound changes in electrical materials properties. Here, we study charge-transfer interactions between the common molecular p-dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and a systematic series of thiophene-based copolymers by a combination of spectroscopic techniques and electrical measurements. Subtle variations in chemical structure are seen to significantly impact the nature of the charge-transfer species and the efficiency of the doping process, underlining the need for a more detailed understanding of the microscopic doping mechanism in organic semiconductors to reliably guide targeted chemical design.
Journal of polymer science : B, Polymer physics
10.1002/polb.23631
0887-6266
1099-0488
wos:2015
WOS:000346080500005
Koch, N (reprint author), Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany., norbert.koch@physik.hu-berlin.de
Fatemeh Ghani
Andreas Opitz
Patrick Pingel
Georg Heimel
Ingo Salzmann
Johannes Frisch
Dieter Neher
Argiri Tsami
Ullrich Scherf
Norbert Koch
eng
uncontrolled
charge transfer
eng
uncontrolled
conducting polymers
eng
uncontrolled
doping
eng
uncontrolled
thiophene
Institut für Physik und Astronomie
Referiert