Multi-Alternating Organic Semiconducting Films with High Electric Conductivity

High electric conductivity is observed in multilayer stack of m‐MTDATA/F16CuPc. Impedance data shows that the circuit resistance is significantly dropped by three orders of magnitude from ∼0.2 MΩ to ∼0.4 kΩ when the number of alternating units is increased from one to six, keeping a total thickness...

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Bibliographic Details
Published in:Advanced functional materials 2014-09, Vol.24 (34), p.5375-5379
Main Authors: Mo, Hin-Wai, Lo, Ming-Fai, Yang, Qing-Dan, Ng, Tsz-Wai, Lee, Chun-Sing
Format: Article
Language:English
Subjects:
Circuits
conductivity
Devices
Electrical conductivity
electrical resistivity
Heterojunctions
Impedance
Multilayers
organic semiconductors
semiconductor heterojunctions
Stability
Stacks
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Summary:High electric conductivity is observed in multilayer stack of m‐MTDATA/F16CuPc. Impedance data shows that the circuit resistance is significantly dropped by three orders of magnitude from ∼0.2 MΩ to ∼0.4 kΩ when the number of alternating units is increased from one to six, keeping a total thickness of 300 nm. Impedance results show that as the number of alternating units increases, the organic stack shows an increasing capacitance and a decreasing resistance. This result suggests the increasing charges accumulate at the heterojunctions, leading to reduction in overall film resistance. The application of the high conductive units in OLED device results in stability enhancement. High conductivity in a thick organic multi­layer stack (up to 4 × 102 S cm‐1) is reported. It is shown that the high conductivity comes from the charge‐transfer complex interface between m‐MTDATA and F16CuPc.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201400468