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학술지 Investigation of Improved Performance for Organic Rectifying Diodes via Electrical Annealing
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저자
강찬모, 노정균, 신현우, 이창희, 이현구
발행일
201907
출처
IEEE Access, v.7, pp.84082-84090
ISSN
2169-3536
출판사
IEEE
DOI
https://dx.doi.org/10.1109/ACCESS.2019.2924666
협약과제
19ZB1200, 임플란터블 능동 전자소자 원천기술 개발, 이정익
초록
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.
키워드
Electrical annealing, field-Assisted annealing, impedance spectroscopy, organic diodes, organic rectifiers, pentacene diodes
KSP 제안 키워드
Impedance spectra, Impedance spectroscopy(IS), Mixed layer, Organic Diodes, Organic devices, Organic light-emitting diodes(OLEDS), Organic photovoltaics(OPVs), Organic thin-film transistors, Polymer chain, Reverse bias, Thermally evaporated