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Flexible Organic Photodetectors with Mechanically Robust Zinc Oxide Nanoparticle Thin Films
- Title
- Flexible Organic Photodetectors with Mechanically Robust Zinc Oxide Nanoparticle Thin Films
- Authors
- Byeon, Huikyeong; Kim, Boyun; Hwang, Hyejee; Kim, Minji; Yoo, Hyeonjin; Song, Hyebin; Lee, Seoung Ho; Lee, Byoung Hoon
- Ewha Authors
- 이병훈
- SCOPUS Author ID
- 이병훈
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- ISSN
- 1944-8244
1944-8252
- Citation
- ACS APPLIED MATERIALS & INTERFACES
- Keywords
- zinc oxide nanoparticle; multicharged conjugated electrolyte; multivalent interaction; flexible electronics; organic photodetectors
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
Early Access
- Abstract
- Zinc oxide nanoparticle (ZnO-NP) thin films have been intensively used as electron transport layers (ETLs) in organic optoelectronic devices, but their moderate mechanical flexibility hinders their application to flexible electronic devices. This study reveals that the multivalent interaction between ZnO-NPs and multicharged conjugated electrolytes, such as diphenyl-fluorene pyridinium bromide derivative (DFPBr-6), can signifi-cantly improve the mechanical flexibility of ZnO-NP thin films. Intermixing ZnO-NPs and DFPBr-6 facilitates the coordination between bromide anions (from the DFPBr-6) and zinc cations on ZnO-NP surfaces, forming Zn2+-Br- bonds. Different from a conventional electrolyte (e.g., KBr), DFPBr-6 with six pyridinium ionic side chains holds the Br--chelated ZnO-NPs adjacent to DFP+ through Zn2+-Br--N+ bonds. Consequently, ZnO-NP:DFPBr-6 thin films exhibit improved mechanical flexibility with a critical bending radius as low as 1.5 mm under tensile bending conditions. Flexible organic photodetectors with ZnO-NP:DFPBr-6 thin films as ETLs demonstrate reliable device performances with high R (0.34 A/W) and D* (3.03 x 1012 Jones) even after 1000 times repetitive bending at a bending radius of 4.0 mm, whereas devices with ZnO-NP and ZnO-NP:KBr ETLs yield >85% reduction in R and D* under the same bending condition.
- DOI
- 10.1021/acsami.3c00947
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
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