TY - JOUR
T1 - Energy-level alignment at strongly coupled organic-metal interfaces
AU - Chen, Meng Ting
AU - Hofmann, Oliver T.
AU - Gerlach, Alexander
AU - Bröker, Benjamin
AU - Bürker, Christoph
AU - Niederhausen, Jens
AU - Hosokai, Takuya
AU - Zegenhagen, Jörg
AU - Vollmer, Antje
AU - Rieger, Ralph
AU - Müllen, Klaus
AU - Schreiber, Frank
AU - Salzmann, Ingo
AU - Koch, Norbert
AU - Zojer, Egbert
AU - Duhm, Steffen
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Energy-level alignment at organic-metal interfaces plays a crucial role for the performance of organic electronic devices. However, reliable models to predict energetics at strongly coupled interfaces are still lacking. We elucidate contact formation of 1,2,5,6,9,10-coronenehexone (COHON) to the (1 1 1)-surfaces of coinage metals by means of ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, the x-ray standing wave technique, and density functional theory calculations. While for low COHON thicknesses, the work-functions of the systems vary considerably, for thicker organic films Fermi-level pinning leads to identical work functions of 5.2 eV for all COHON-covered metals irrespective of the pristine substrate work function and the interfacial interaction strength.
AB - Energy-level alignment at organic-metal interfaces plays a crucial role for the performance of organic electronic devices. However, reliable models to predict energetics at strongly coupled interfaces are still lacking. We elucidate contact formation of 1,2,5,6,9,10-coronenehexone (COHON) to the (1 1 1)-surfaces of coinage metals by means of ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, the x-ray standing wave technique, and density functional theory calculations. While for low COHON thicknesses, the work-functions of the systems vary considerably, for thicker organic films Fermi-level pinning leads to identical work functions of 5.2 eV for all COHON-covered metals irrespective of the pristine substrate work function and the interfacial interaction strength.
KW - density functional theory
KW - energy-level alignment
KW - Organic-metal interface
KW - photoelectron spectroscopy
KW - x-ray standing waves
UR - http://www.scopus.com/inward/record.url?scp=85062945914&partnerID=8YFLogxK
U2 - 10.1088/1361-648X/ab0171
DO - 10.1088/1361-648X/ab0171
M3 - Article
C2 - 30673641
AN - SCOPUS:85062945914
SN - 0953-8984
VL - 31
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 19
M1 - 194002
ER -