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Journal Article
Investigation of Improved Performance for Organic Rectifying Diodes via Electrical Annealing
- Authors
- Chan-Mo Kang, Jeongkyun Roh, Hyeonwoo Shin, Changhee Lee, Hyunkoo Lee
- Issue Date
- 2019-07
- Citation
- IEEE Access, v.7, pp.84082-84090
- ISSN
- 2169-3536
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- Electrical annealing (EA) is one of the post treatments to enhance the electrical performances of organic devices. To date, the improvements using EA have only been reported for the solution-processed devices because its mechanism has been known as the alignments of ionic impurities or polymer chains. In this paper, we applied EA to thermally evaporated organic diodes which not have ionic impurities or polymer chains. After EA, the turn-on voltage of the diode was reduced, and the forward-bias current of the diode was increased without changing the reverse-bias current, resulting in an improvement of the cutoff frequency of the rectifier. In addition, we proposed a new mechanism to explain why the EA can be applied to the thermally evaporated organic devices. Based on time-of-flight secondary ion mass spectrometry and impedance spectra, we suggest that this improvement is due to the creation of a MoO3:pentacene mixed layer, leading to ease of charge injection. We believe that our finding will be helpful to understand change at the organic/metal interfaces and useful to apply a wide range of organic devices such as organic photovoltaics, organic light-emitting diodes, and organic thin-film transistors.
- KSP Keywords
- Impedance spectra, Improved performance, Mixed layer, Organic Diodes, Organic photovoltaics, Polymer chain, Reverse bias, Thermally evaporated, Thin-Film Transistor(TFT), Time of flight secondary ion mass spectrometry(ToF-SIMS), Turn-on voltage
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
