Fabrication of a Flexible Photodetector Based on a Liquid Eutectic Gallium Indium
- Authors
- Xiao, P.; Gwak, Hyun-Jong; Seo, Soonmin
- Issue Date
- Nov-2020
- Publisher
- MDPI AG
- Keywords
- EGaIn; Eutectic gallium indium; Flexible electronics; Flexible photodetector; Gallium alloy; Liquid metal
- Citation
- Materials, v.13, no.22, pp.1 - 11
- Journal Title
- Materials
- Volume
- 13
- Number
- 22
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/79377
- DOI
- 10.3390/ma13225210
- ISSN
- 1996-1944
- Abstract
- A fluidic gallium-based liquid metal (LM) is an interesting material for producing flexible and stretchable electronics. A simple and reliable method developed to facilitate the fabrication of a photodetector based on an LM is presented. A large and thin conductive eutectic gallium indium (EGaIn) film can be fabricated with compressed EGaIn microdroplets. A solution of LM microdroplets can be synthesized by ultrasonication after mixing with EGaIn and ethanol and then dried on a PDMS substrate. In this study, a conductive LM film was obtained after pressing with another substrate. The film was sufficiently conductive and stretchable, and its electrical conductivity was 2.2 × 106 S/m. The thin film was patterned by a fiber laser marker, and the minimum line width of the pattern was approximately 20 µm. Using a sticky PDMS film, a Ga2 O3 photo-responsive layer was exfoliated from the fabricated LM film. With the patterned LM electrode and the transparent photo-responsive film, a flexible photodetector was fabricated, which yielded photo-response-current ratios of 30.3%, 14.7%, and 16.1% under 254 nm ultraviolet, 365 nm ultraviolet, and visible light, respectively. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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