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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab.
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Ultrathin Graphene Intercalation in PEDOT:PSS/Colorless Polyimide-Based Transparent Electrodes for Enhancement of Optoelectronic Performance and Operational Stability of Organic Devices

Author(s)
Lee, Do HeeYun, Hyung DukJung, Eui DaeChu, Jae HwanNam, Yun SeokSong, SeungukSeok, Shi-HyunSong, Myoung HoonKwon, Soon-Yong
Issued Date
2019-06
DOI
10.1021/acsami.9b04118
URI
https://scholarworks.unist.ac.kr/handle/201301/26868
Fulltext
https://pubs.acs.org/doi/10.1021/acsami.9b04118
Citation
ACS APPLIED MATERIALS & INTERFACES, v.11, no.23, pp.21069 - 21077
Abstract
A novel flexible transparent electrode (TE) having a trilayer-stacked geometry and high optoelectronic performance and operational stability was fabricated by the spin coating method. The trilayer was composed of an ultrathin graphene (Gr) film sandwiched between a transparent and colorless polyimide (TCPI) layer and a methanesulfonic acid (MSA)-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer containing dimethylsulfoxide and Zonyl fluorosurfactant (designated as MSA-PDZ film). The introduction of solution-processable TCPI enabled the direct formation of high-quality graphene on organic surfaces with a clean interface. Stable doping of graphene with the MSA-PDZ film enabled tuning of the inherent work function and optoelectronic properties of the PEDOT:PSS films, leading to a high figure of merit of ∼70 in the as-fabricated TEs. Particularly, from multivariate and repetitive harsh environmental tests (T = −50 to 90 °C, over 90 RH%), the TCPI/Gr heterostructure exhibited excellent tolerance to mechanical and thermal stresses and gas barrier properties that protected the MSA-PDZ film from exposure to moisture. Owing to the synergetic effect from the TCPI/Gr/MSA-PDZ anode structure, the TCPI/Gr/MSA-PDZ-based polymer light-emitting diodes showed highly improved current and power efficiencies with maxima as high as 20.84 cd/A and 22.92 lm/W, respectively (comparable to those of indium tin oxide based PLEDs), in addition to much enhanced mechanical flexibility.
Publisher
American Chemical Society (ACS)
ISSN
1944-8244
Keyword (Author)
flexible transparent electrodesgraphenecolorless polyimideorganic thin filmoperational stabilityflexible organic devices
Keyword
SINGLE-LAYER GRAPHENESOLAR-CELLSFILMSEFFICIENCYCOLORLESSPEDOTPSSWATERPHOTOVOLTAICSCONDUCTIVITYCOMPOSITES

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