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Systematic modification of the indium tin oxide work function via side-chain modulation of an amino-acid functionalization layer

Published on Jan 1, 2019in Physical Chemistry Chemical Physics3.57
· DOI :10.1039/C9CP04079J
Naomi Kramer , Soumyajit Sarkar8
Estimated H-index: 8
+ 1 AuthorsNurit Ashkenasy17
Estimated H-index: 17
Abstract
Controlled modification of the semiconductor surface work function is of fundamental importance for improvements in the efficiency of (opto-)electronic devices. Binding amino acids to a semiconductor surface through their common carboxylic group offers a versatile tool for modulation of surface properties by the choice of their side chain. This approach is demonstrated here by tailoring the surface work function of indium tin oxide, one of the most abundant transparent electrodes in organic optoelectronic devices. We find that the work function can be systematically tuned by the side chain of the amino acid, resulting in either an increase or a decrease of the work function, over a large range of ~250 meV. This side chain effect is mostly due to alteration of the dipole component perpendicular to the surface, with a generally smaller contribution for changes in surface band bending. These findings also shed light on electronic interactions at the interface between proteins and semiconductors, which are of importance for future bio-electronic devices.
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References59
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#1Marion J. Limo (NTU: Nottingham Trent University)H-Index: 4
#2Anna Sola-Rabada (NTU: Nottingham Trent University)H-Index: 3
Last.Carole C. Perry (NTU: Nottingham Trent University)H-Index: 44
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#1Cunlan Guo (Weizmann Institute of Science)H-Index: 12
#2Soumyajit Sarkar (Weizmann Institute of Science)H-Index: 8
Last.Satoshi Kera (Chiba University)H-Index: 30
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#1M Caruso (University of Rome Tor Vergata)H-Index: 7
#2Emanuela Gatto (University of Rome Tor Vergata)H-Index: 15
Last.Mariano Venanzi (University of Rome Tor Vergata)H-Index: 25
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#1Maayan Matmor (BGU: Ben-Gurion University of the Negev)H-Index: 6
#2George A. Lengyel (University of Pittsburgh)H-Index: 6
Last.Nurit Ashkenasy (BGU: Ben-Gurion University of the Negev)H-Index: 17
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#1Stefano Casalini (University of Modena and Reggio Emilia)H-Index: 13
#2Carlo Augusto Bortolotti (University of Modena and Reggio Emilia)H-Index: 17
Last.Fabio Biscarini (University of Modena and Reggio Emilia)H-Index: 46
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