Premium
Indium‐Tin‐Oxide (ITO) Work Function Tailoring by Covalently Bound Carboxylic Acid Self‐Assembled Monolayers (Phys. Status Solidi B 8/2018)
Author(s) -
Rittich Julia,
Jung Sebastian,
Siekmann Johanna,
Wuttig Matthias
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201870128
Subject(s) - monolayer , indium tin oxide , work function , electrode , substrate (aquarium) , materials science , self assembled monolayer , covalent bond , indium , thin film transistor , tin , carboxylic acid , optoelectronics , oxide , nanotechnology , chemistry , thin film , polymer chemistry , organic chemistry , metallurgy , oceanography , geology
The efficiency of optoelectronic devices is crucially depending on the charge carrier injection at the electrode–organic interface. Thus, its optimization is required to reduce energy losses. In their article no. 1800075 , Rittich and Jung et al. discuss the tuning of the electrode work function via selfassembled monolayers (SAMs) for optimized charge transfer. In a combined experimental and theoretical study, the interface energetics of indium‐tin oxide (ITO) electrodes modified by carboxylic acid SAMs are analyzed. Employing a systematic approach, a range of low work function electrodes can be reached down to 3.5 eV. The work functions obtained can be described by a model established in literature, which is modified to include the decisive chemical bond between substrate and molecule. Finally, organic thin film transistors are produced exhibiting lower contact resistances, which indicate a successful alignment of the charge transport levels at the electrode–organic interface.