Self-powered Organic Photodiode for Near-Infrared Sensing with Functional Interlayer

Lee, Yingju; Lee, Hyeong Won; Jang, Hyowon; Biswas, Swarup; Kim, Hyeok

doi:10.1109/iceic54506.2022.9748355

Cited by 1 publication

(1 citation statement)

References 8 publications

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“…Notably, these values are similar to those of the recently reported OPDs (Table S4). − However, the R and D * of the flexible OPDs fabricated with the ZnO-NP and ZnO-NP:KBr ETLs/HBLs were gradually decreased after bending 500 and 1000 times at r = 4.0 mm, whereas the ZnO-NP:DFPBr-6 device produced almost identical R and D * regardless of bending cycles (Figure d). The R values of the ZnO-NP and ZnO-NP:KBr devices were decreased to 0.06 and 0.02 A/W corresponding to 85 and 95% reductions, respectively, after bending 1000 times at r = 4.0 mm (Table S3).…”

Section: Resultsmentioning

confidence: 97%

Flexible Organic Photodetectors with Mechanically Robust Zinc Oxide Nanoparticle Thin Films

Byeon

Kim

Hwang

et al. 2023

ACS Appl. Mater. Interfaces

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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 diphenylfluorene pyridinium bromide derivative (DFPBr-6), can significantly 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 Zn 2+ −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 Zn 2+ −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 × 10 12 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.

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