Multidimensional graphene and ZnO-based heterostructure for flexible transparent ultraviolet photodetector

Ko, Kang Bok; Ryu, Beo Deul; Han, Min; Hong, Chang–Hee; Dinh, Duc Anh; Cường, Trần Việt

doi:10.1016/j.apsusc.2019.03.163

Cited by 38 publications

(26 citation statements)

References 41 publications

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“…As compared to most of the previous study, the transparent and exible UV photodetectors which are prepared by using ZnO thin lms annealed by using TDA method show the best performances in terms of fastest rise/decay times at lowest bias voltage. Ko et al reported the highest value of dark current and photocurrent for their UV photodetectors, but they 38 But, in general, the value of dark current and photocurrent is affected to the value of bias voltage and it means that accurate comparison of the UV photodetector performance is impossible at different bias voltage. Thus, we compared the rise and decay time constant of UV photodetector, which is not affected to the bias voltage.…”

Section: Resultsmentioning

confidence: 99%

Crystallization of ZnO thin films without polymer substrate deformation via thermal dissipation annealing method for next generation wearable devices

Kim

2021

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Crystallization of ZnO thin films without polymer substrate deformation via thermal dissipation annealing method for next generation wearable devices

Kim

2021

RSC Adv.

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“…4,29,30 It should be noted that better device performance has been observed in nanohybrid UV detectors by optimal device design to take advantages of high carrier mobility of graphene, while scaling up the nanohybrid detectors remains challenging. 1,43−45 This means that further improvement of nanocomposite UV detectors is possible through implementing nanohybrid device designs.…”

Section: Resultsmentioning

confidence: 99%

Inkjet-Printed Imbedded Graphene Nanoplatelet/Zinc Oxide Bulk Heterojunctions Nanocomposite Films for Ultraviolet Photodetection

et al. 2019

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A ZnO sol–gel precursor (ZnOPr) and graphene nanoplatelets (GnPs) are mixed into a composite ink for inkjet printing photodetectors with bulk heterojunctions of ZnO/GnP on a heated SiO2/Si substrate. Heating of the SiO2/Si wafers at ∼50 °C was found optimal to prevent segregated droplets on the hydrophobic surface of the SiO2/Si substrate during printing. After printing the ZnO/GnP channels, thermal annealing at 350 °C for 2 h was performed for crystallization of ZnO and formation of the ZnO/GnP heterojunctions. The GnP concentration was varied from 0, 5, 20, and 30 mM to evaluate optimal formation of the ZnO/GnP bulk heterojunction nanocomposites based on ultraviolet photoresponse performance. The best performance was observed at the 20 mM GnP concentration with the photoresponsivity reaching 2.2 A/W at an incident ultraviolet power of 2.2 μW and a 5 V bias. This photoresponsivity is an order of magnitude better than the previously reported counterparts, including 0.13 mA/W for dropcasted ZnO-graphite composites and much higher than 0.5 A/W for aerosol printed ZnO. The improved performance is attributed to the ZnO/GnP bulk heterojunctions with improved interfaces that enable efficient exciton dissociation and the charge transport. The developed inkjet printing of sol–gel composite inks approach can be scalable and low cost for practical applications.

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“…The responsivity and detectivity of the device are seen to be higher than the exiting graphene/ZnO-based devices as well as other ZnO-based p-n, MSM and Schottky junctions. The device is expected to exhibit similar responses even when it is bent [37,38]. It is clear from the results that the fabricated device outperforms the existing devices and thereby becomes a potential competitor for the existing flexible detectors that are expected to dominate the future's Si photonic and optoelectronic market.…”

Section: Uv Detectionmentioning

confidence: 92%

Fabrication of graphene–ZnO heterostructure-based flexible and thin platform-based UV detector

Kumar

Varghese

Janyani

2021

J Mater Sci: Mater Electron

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This work presents the performance evaluation of Graphene/ZnO Schottky junctions grown on flexible indium tin oxide (ITO)-coated polyethylene terephthalate (PET) substrates. The fabricated structures include chemical vapour deposition grown graphene layer on ITO-coated PET substrates. Polymethyl methacrylate assisted transfer method has been employed for the successful transfer of graphene from Cu substrate to PET. The smaller D-band intensity (1350 cm−1) compared to G-band (1580 cm−1) indicates good quality of carbon lattice with less number of defects. High-quality ZnO has been deposited through RF sputtering. The deposited ZnO with grain size 50–95 nm exhibited dislocation densities of 1.31270 × 10–3 nm−2 and compressive nature with negative strain of − 1.43156 GPa. Further, the electrical and optical characterization of the devices has been done through device I–V characterization and UV detection analysis. The UV detection capability of the device has been carried out with the aid of a UV-lamp of 365 nm wavelength. The fabricated graphene/ZnO photodetector showed good response to UV illumination. The device performance analysis has been done through a comparison of the device responsivity and detectivity with the existing detectors. The detectivity and responsivity of the fabricated detectors were 7.106 × 109 mHz1/2 W−1 and 0.49 A W−1, respectively.

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Multidimensional graphene and ZnO-based heterostructure for flexible transparent ultraviolet photodetector

Cited by 38 publications

References 41 publications

Crystallization of ZnO thin films without polymer substrate deformation via thermal dissipation annealing method for next generation wearable devices

Crystallization of ZnO thin films without polymer substrate deformation via thermal dissipation annealing method for next generation wearable devices

Inkjet-Printed Imbedded Graphene Nanoplatelet/Zinc Oxide Bulk Heterojunctions Nanocomposite Films for Ultraviolet Photodetection

Fabrication of graphene–ZnO heterostructure-based flexible and thin platform-based UV detector

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