ITO Breakers: Highly Transparent Conducting Polymer/Metal/Dielectric (P/M/D) Films for Organic Solar Cells

Ormoclear/Ag/WO3 (OAW) films with ultrahigh transparency are designed for application in organic solar cells (OSCs). When the thicknesses of Ag and WO3 are fixed at 8 nm and 30 nm, respectively, excellent transparency that is independent of Ormoclear thickness is successfully achieved by employing s...

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Bibliographic Details
Published in:Advanced energy materials 2014-10, Vol.4 (15), p.np-n/a
Main Authors: Ham, Juyoung, Lee, Jong-Lam
Format: Article
Language:English
Subjects:
Density
dielectric/metal/dielectric structures
Dielectrics
Electrodes
Indium tin oxide
organic solar cells
Photovoltaic cells
Silver
Solar cells
Solar energy
transparent electrodes
Tungsten oxides
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Summary:Ormoclear/Ag/WO3 (OAW) films with ultrahigh transparency are designed for application in organic solar cells (OSCs). When the thicknesses of Ag and WO3 are fixed at 8 nm and 30 nm, respectively, excellent transparency that is independent of Ormoclear thickness is successfully achieved by employing soft materials instead of inorganic dielectrics. Oxygen plasma treatment prior to the deposition of Ag introduces the polar functional groups on the Ormoclear surface, which results in increasing the surface hydrophilicity, thereby enhancing the wettability of Ag. From the surface modification, OAW exhibits low sheet resistance (4.8 ohm sq‐1), high transmittance of up to 96.3% at 535 nm, and enhanced efficiency of 7.63% of OSCs. Moreover, nanoimprint lithography is used to prepare a well‐ordered nanopatterned OAW with dimple diameter of 90 nm, leading to further increase in photocurrent density by 17%, compared to that with a planar indium tin oxide (ITO) electrode. Indium tin oxide (ITO)‐free organic solar cells with high power conversion efficiency (≈7.7%) are fabricated using a polymer/metal/dielectric (PMD) electrode. Using a polymer layer makes it possible to demonstrate high transmittance that is insensitive to the film thickness, in addition to well‐ordered nanopatterns on a PMD electrode. This leads to an enhancement in the photocurrent density of 17%, compared to a typical device based on an ITO electrode.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201400539