TY  - JOUR
A1  - Hörmann, Ulrich
A1  - Zeiske, Stefan
A1  - Piersimoni, Fortunato
A1  - Hoffmann, Lukas
A1  - Schlesinger, Raphael
A1  - Koch, Norbert
A1  - Riedl, Thomas
A1  - Andrienko, Denis
A1  - Neher, Dieter
T1  - Stark effect of hybrid charge transfer states at planar ZnO/organic interfaces
JF  - Physical review : B, Condensed matter and materials physics
N2  - We investigate the bias dependence of the hybrid charge transfer state emission at planar heterojunctions between the metal oxide acceptor ZnO and three donor molecules. The electroluminescence peak energy linearly increases with the applied bias, saturating at high fields. Variation of the organic layer thickness and deliberate change of the ZnO conductivity through controlled photodoping allow us to confirm that this bias-induced spectral shift relates to the internal electric field in the organic layer rather than the filling of states at the hybrid interface. We show that existing continuum models overestimate the hole delocalization and propose a simple electrostatic model in which the linear and quadratic Stark effects are explained by the electrostatic interaction of a strongly polarizable molecular cation with its mirror image.
Y1  - 2018
U6  - https://doi.org/10.1103/PhysRevB.98.155312
SN  - 2469-9950
SN  - 2469-9969
VL  - 98
IS  - 15
PB  - American Physical Society
CY  - College Park
ER  -