TY - JOUR
T1 - Inverted organic solar cells with sol-gel processed high work-function vanadium oxide hole-extraction layers
AU - Zilberberg, Kirill
AU - Trost, Sara
AU - Meyer, Jens
AU - Kahn, Antoine
AU - Behrendt, Andreas
AU - Lützenkirchen-Hecht, Dirk
AU - Frahm, Ronald
AU - Riedl, Thomas
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2011/12/20
Y1 - 2011/12/20
N2 - For large-scale and high-throughput production of organic solar cells (OSCs), liquid processing of the functional layers is desired. We demonstrate inverted bulk-heterojunction organic solar cells (OSCs) with a sol-gel derived V 2O 5 hole-extraction-layer on top of the active organic layer. The V 2O 5 layers are prepared in ambient air using Vanadium(V)-oxitriisopropoxide as precursor. Without any post-annealing or plasma treatment, a high work function of the V 2O 5 layers is confirmed by both Kelvin probe analysis and ultraviolet photoelectron spectroscopy (UPS). Using UPS and inverse photoelectron spectroscopy (IPES), we show that the electronic structure of the solution processed V 2O 5 layers is similar to that of thermally evaporated V 2O 5 layers which have been exposed to ambient air. Optimization of the sol gel process leads to inverted OSCs with solution based V 2O 5 layers that show power conversion efficiencies similar to that of control devices with V 2O 5 layers prepared in high-vacuum.
AB - For large-scale and high-throughput production of organic solar cells (OSCs), liquid processing of the functional layers is desired. We demonstrate inverted bulk-heterojunction organic solar cells (OSCs) with a sol-gel derived V 2O 5 hole-extraction-layer on top of the active organic layer. The V 2O 5 layers are prepared in ambient air using Vanadium(V)-oxitriisopropoxide as precursor. Without any post-annealing or plasma treatment, a high work function of the V 2O 5 layers is confirmed by both Kelvin probe analysis and ultraviolet photoelectron spectroscopy (UPS). Using UPS and inverse photoelectron spectroscopy (IPES), we show that the electronic structure of the solution processed V 2O 5 layers is similar to that of thermally evaporated V 2O 5 layers which have been exposed to ambient air. Optimization of the sol gel process leads to inverted OSCs with solution based V 2O 5 layers that show power conversion efficiencies similar to that of control devices with V 2O 5 layers prepared in high-vacuum.
KW - high work-function materials
KW - inverted organic solar cells
KW - solution processed metal oxide
KW - vanadium oxide
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U2 - 10.1002/adfm.201101402
DO - 10.1002/adfm.201101402
M3 - Article
AN - SCOPUS:83655202935
SN - 1616-301X
VL - 21
SP - 4776
EP - 4783
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 24
ER -