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Journal Article
Identification of a Multi-stack Structure of Graphene Electrodes Doped Layer-by-layer with Benzimidazole and Its Implication for the Design of Optoelectronic Devices
- Authors
- Hyunsu Cho, Jinouk Song, Jin-Wook Shin, Jaehyun Moon, Byoung-Hwa Kwon, Jeong-Ik Lee, Seunghyup Yoo, Nam Sung Cho
- Issue Date
- 2021-07
- Citation
- Optics Express, v.29, no.15, pp.23131-23141
- ISSN
- 1094-4087
- Publisher
- Optical Society of America (OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- Optical properties of benzimidazole (BI)-doped layer-by-layer graphene differ significantly from those of intrinsic graphene. Our study based on transmission electron microscopy and X-ray photoelectron spectroscopy depth profiling reveals that such a difference stems from its peculiar stratified geometry formed in situ during the doping process. This work presents an effective thickness and optical constants that can treat these multi-stacked BI-doped graphene electrodes as a single equivalent medium. For verification, the efficiency and angular emission spectra of organic light-emitting diodes with the BI-doped graphene electrode are modeled with the proposed method, and we demonstrate that the calculation matches experimental results in a much narrower margin than that based on the optical properties of undoped graphene.
- KSP Keywords
- Bi-doped, Depth profiling(DP), Doping process, Effective thickness, Electron microscopy(SEM), Emission spectra, Equivalent medium, Graphene electrode, Layer-by-layer(LbL), Multi-stack, Optoelectronic devices