Energy level alignment at organic/inorganic semiconductor heterojunctions: Fermi level pinning at the molecular interlayer with a reduced energy gap

2019 ◽  
Vol 21 (27) ◽  
pp. 15072-15079 ◽  
Author(s):  
Raphael Schlesinger ◽  
Stefanie Winkler ◽  
Matthias Brandt ◽  
Sylke Blumstengel ◽  
Ruslan Ovsyannikov ◽  
...  
Keyword(s):  
Energy Level ◽  
Fermi Level ◽  
Energy Gap ◽  
Fermi Level Pinning ◽  
Energy Level Alignment ◽  
Inorganic Semiconductor ◽  
Semiconductor Heterojunctions

A lying (L) molecular interlayer between ZnO and standing (S) sexiphenyl molecules leads to “concealed” Fermi level pinning.

scholarly journals The Interlayer Method: A Universal Tool for Energy Level Alignment Tuning at Inorganic/Organic Semiconductor Heterojunctions

2020 ◽  
pp. 2010174
Author(s):  
Thorsten Schultz ◽  
Dominique Lungwitz ◽  
Elena Longhi ◽  
Stephen Barlow ◽  
Seth R. Marder ◽  
...  
Keyword(s):  
Energy Level ◽  
Organic Semiconductor ◽  
Energy Level Alignment ◽  
Semiconductor Heterojunctions

Interaction and Energy Level Alignment at Interfaces between Pentacene and Low Work Function Metals

2001 ◽  
Vol 708 ◽  
Author(s):  
N. Koch ◽  
J. Ghijsen ◽  
R. Ruiz ◽  
J. Pflaum ◽  
R. L. Johnson ◽  
...  
Keyword(s):  
Energy Level ◽  
Alkali Metal ◽  
Molecular Orbital ◽  
Organic Material ◽  
Alkali Metals ◽  
Energy Gap ◽  
Emission Feature ◽  
Photoemission Spectroscopy ◽  
Energy Level Alignment ◽  
A Charge

ABSTRACTA number of low workfunction metals (samarium, alkali metals) were deposited onto vacuum sublimed thin films of pentacene. The change in the valence electronic structure of the organic material was studied by in situ ultraviolet photoemission spectroscopy (UPS). Alkali metal intercalation leads to the appearance of a new photoemission feature within the pentacene energy gap, due to a charge transfer from the alkali atoms to the lowest unoccupied molecular orbital (LUMO) of the organic material. The energy spacing between this emission feature and the relaxed highest occupied molecular orbital (HOMO) of the pristine molecule is 1 eV. From X-ray photoemission spectroscopy core level analysis, we estimate a concentration ratio of two alkali metal atoms per pentacene molecule at maximum intercalation level, leading to a complete filling of the LUMO. This is consistent with the results from UPS that the new emission is always observed below the Fermi-level. Samarium is found to exhibit a more subtle interaction with pentacene: the molecular orbitals remain almost unperturbed upon Sm deposition. The resulting energy level alignment at this interface seems to be very favorable for the injection of electrons from Sm into pentacene, as the HOMO-onset is found at 1.8 eV below the metal Fermi edge. This value is close to the 2.2 eV HOMO-LUMO gap of pentacene measured by UPS and inverse photoemission spectroscopy, thus corresponding to a small electron injection barrier.

Fermi level pinning and band bending in δ-doped BaSnO3

2021 ◽  
Vol 118 (5) ◽  
pp. 052101
Author(s):  
Youjung Kim ◽  
Hyeongmin Cho ◽  
Kookrin Char
Keyword(s):  
Fermi Level ◽  
Band Bending ◽  
Fermi Level Pinning

scholarly journals Energy Level Alignment at the C 60 /Monolayer‐WS 2 Interface on Insulating and Conductive Substrates

2021 ◽  
pp. 2100425
Author(s):  
Jie Ma ◽  
Patrick Amsalem ◽  
Thorsten Schultz ◽  
Dongguen Shin ◽  
Xiaomin Xu ◽  
...  
Keyword(s):  
Energy Level ◽  
Energy Level Alignment ◽  
Conductive Substrates
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